Dentalium caledonicum

<p>During a recent deep-sea dive off the coast of Hawaii, scientists encountered a rare and mesmerizing ocean creature known as the “Dumbo octopus."&nbsp;</p>



<p>This remarkable sighting occurred approximately a mile below the ocean's surface, on an unnamed seamount located within the <a href="https://www.papahanaumokuakea.gov/" target="_blank" rel="noreferrer noopener">Papahānaumokuākea</a> Marine National Monument.</p>



<p>The expedition was funded by the <a href="https://nautiluslive.org/video/2023/09/27/cute-dumbo-octopus-eyes-rov-hercules">National Oceanic and Atmospheric Association</a> (NOAA).&nbsp;</p>



<h2 class="wp-block-heading" id="h-dumbo-octopus">Dumbo octopus</h2>



<p>The Dumbo octopus, also known as Grimpoteuthis, belongs to the umbrella <a href="https://www.earth.com/news/octopus-and-squid-senses-linked-to-human-brain-evolution/">octopus</a> family. The nickname "Dumbo" comes from its resemblance to the character in Disney's 1941 film, due to the prominent ear-like fins situated on top of its head. The octopus utilizes these fins to gracefully propel itself through the water, as it searches for food.</p>



<p>The Dumbo <a href="https://www.earth.com/news/secret-garden-thermal-springs-accelerate-octopus-egg-hatching-by-years/" target="_blank" rel="noreferrer noopener">octopus</a> is usually found in the deep waters of the central Pacific at depths ranging from 1,300 to 13,000 feet. However, some of these intriguing animals have been found as deep as 23,000 feet.&nbsp;</p>



<p>Because they live in such deep, dark environments, their coloration can vary, often appearing in shades of red, pink, brown, or white.</p>



<h2 class="wp-block-heading" id="h-fascinating-footage-nbsp">Fascinating footage&nbsp;</h2>



<p>The footage of the Dumbo octopus was captured by the Exploration Vessel (E/V) Nautilus, providing a unique opportunity to observe the creature as it effortlessly drifts in the ocean's depths.&nbsp;</p>



<div class="wp-block-sendtonews-playerselector">[sendtonews key="9KGzHmAd5J-3029266-12187" type="single"]</div>



<p>The crew aboard the E/V Nautilus was fortunate enough to witness not just one, but five of these creatures in a single night.</p>



<h2 class="wp-block-heading" id="h-a-beautiful-experience">A beautiful experience</h2>



<p>Jaina Galves, a video engineer intern who played a role in this discovery, shared her excitement about the experience.</p>



<p>“Each time, you’re kind of just roaming around with the ROV,” said Galves. “Somebody’s like, wait, what is that in the corner, and then everybody starts to gasp, everybody starts to freak out. And everybody’s like Dumbo octopus!"</p>



<p>"So we take the ROV over, we go, and we follow them. They move very slowly and very gracefully, so we get to follow them for quite a while.”</p>



<p>“It depends on what we’re doing and how long we can hang out. But for one of them, we just got to stay for quite a while. Just watched it kind of glide through the water, and it was beautiful.”</p>



<p>Galves told ABC News: “When I saw it on the screen, I couldn’t even say anything. My jaw was just on the floor.”</p>



<h2 class="wp-block-heading" id="h-unique-characteristics">Unique characteristics</h2>



<h3 class="wp-block-heading" id="h-size">Size</h3>



<p>Overall, scientists have discovered more than a dozen species of dumbo octopuses. The largest individual captured on film was nearly six feet long, according to the environmental group Oceana, but most are much smaller, with an average length of 8 to 12 inches.&nbsp;</p>



<h3 class="wp-block-heading" id="h-appearance">Appearance</h3>



<p>Dumbo octopuses are characterized by their unique umbrella-shaped appearance when their arms are spread. They possess a soft, gelatinous body, which is an adaptation to the deep-sea environment.</p>



<h3 class="wp-block-heading" id="h-diet">Diet</h3>



<p>The <a href="https://www.earth.com/earthpedia-articles/are-octopuses-smart/" target="_blank" rel="noreferrer noopener">octopuses</a> feed on crustaceans, benthic worms, and other small organisms found on the ocean floor. They often swallow their prey whole.</p>



<h3 class="wp-block-heading" id="h-reproduction-nbsp">Reproduction&nbsp;</h3>



<p>Unlike many other octopus species, Dumbo <a href="https://www.earth.com/news/do-octopuses-dream-a-recent-study-shows-octopuses-sleep-is-very-similar-to-humans/" target="_blank" rel="noreferrer noopener">octopuses</a> do not have a defined breeding season. They can lay eggs at any time, and the young are developed enough to survive on their own immediately after hatching. While their exact lifespan is unknown, it is believed to be about 3 to 5 years.</p>



<p>The species is known for its gentle and passive demeanor, and since it inhabits regions difficult for humans to access, it has not been extensively studied, and much about it remains a mystery.</p>



<p>The E/V Nautilus, owned by the nonprofit organization <a href="https://nautiluslive.org/" target="_blank" rel="noreferrer noopener">Ocean Exploration Trust</a>, is currently exploring the expansive Papahānaumokuākea Marine National Monument. This protected marine area spans over 500,000 square miles in the Pacific, making it larger than all U.S. national parks combined.</p>



<p>---</p>



<p>Video and image credit: NOAA Ocean Exploration via the Ocean Exploration Cooperative Institute</p>



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<p>.</p>

"Dumbo octopus" captured on film and video in Hawaii

During a recent deep-sea dive off the coast of Hawaii,...

<p>As our planet faces escalating challenges from global warming, a group of international scientists will be recruiting a surprising ally in the fight against <a href="https://www.earth.com/news/greenhouse-gas-emissions-reach-another-all-time-high/">greenhouse emissions</a>: the cow.&nbsp;</p>



<p>At the University of Illinois Urbana-Champaign, experts in animal sciences are launching a novel venture aimed at cutting methane emissions due to rumen fermentation in beef and dairy cattle.&nbsp;</p>



<h2 class="wp-block-heading" id="h-greener-cattle">Greener cattle</h2>



<p>Spanning three years and backed by a $3.2-million budget, this undertaking falls under the umbrella of the <a href="https://foundationfar.org/consortia/greener-cattle-initiative/">Greener Cattle Initiative</a>, which is backed by the Foundation for Food and Agriculture Research (FFAR).</p>



<p>Research data indicates that taking on methane might be a faster route to addressing climate issues than solely focusing on carbon dioxide (CO2). Methane’s heat-trapping ability is 28 times stronger than CO2’s, but it exits the atmosphere in roughly a dozen years, while CO2 can linger for centuries.</p>



<p>“What this means is that anything we do now with ruminant animals can have a huge impact on warming within decades, rather than centuries. Our challenge is to reduce enteric methane emissions by about 30 to 40 percent with the technologies we have,” said project leader Rod Mackie, a professor in the Department of Animal Sciences at U of I.&nbsp;</p>



<h2 class="wp-block-heading" id="h-focus-of-the-study">Focus of the study</h2>



<p>Connecting six research centers globally, this project zeroes in on enteric methane – a byproduct of microbial fermentation in the rumen. As a part of this strategy, Mackie and his colleagues aim to examine hydrogen’s role during fermentation.</p>



<p>During the fermentation process, the recycling of an energy-rich molecule, NADH, stands out. For the uninterrupted generation of energy, NADH must release its hydrogen and anticipate a replacement from the decomposition of carbohydrates. Generally, NADH’s surplus hydrogen aids in turning CO2 into methane. Yet, the scientists speculate that there are alternatives to use this type of hydrogen.</p>



<p>“In anaerobic fermentation in the rumen, you have to have some way of recycling hydrogen through the conversion of NADH to NAD. In that process, most of the excess hydrogen goes towards methane. If you shut down methane production, hydrogen builds up and inhibits glycolysis,” Mackie explained.&nbsp;</p>



<p>“We don’t want that to happen. Instead, we want to redirect hydrogen into other products, such as propionate and butyrate, reduced fatty acids that serve as the primary energy source for all ruminants.”</p>



<h2 class="wp-block-heading" id="h-methane-reduction">Methane reduction</h2>



<p>“There are a lot of groups working on inhibiting methane directly using dietary additives. Our focus is trying to figure out how we actually make it work in an animal and make it more energetically feasible. That’s really been the missing piece,” added Josh McCann, an assistant professor of Animal Sciences at the same university, who will also be involved in the project.&nbsp;</p>



<p>“If cows can’t metabolize the excess hydrogens for productive benefit and to improve growth, there will continue to be limited adoption of methane reduction strategies or additives. There’s no economic incentive.”</p>



<h2 class="wp-block-heading" id="h-microbial-communities-nbsp">Microbial communities&nbsp;</h2>



<p>The team’s strategy begins in the lab through a thorough investigation of hydrogen production and its utilization. By examining rumen microbial communities from diverse cattle, the researchers aim to uncover potential tweaks using inhibitor compounds. Their findings will eventually be tested on cattle.</p>



<p>“Most of the grant is focused on the basic and the mechanistic side, but once we make something that might work within a microbial community, it still has to work in an animal,” McCann explained.&nbsp;</p>



<h2 class="wp-block-heading" id="h-methane-inhibitor-nbsp">Methane inhibitor&nbsp;</h2>



<p>“We have complicating factors like diet components and how much they want to eat. Not to mention dairy cattle and beef cattle are eating different things, so the bugs in the rumen function differently. So, if we apply a methane inhibitor to a dairy microbial community, we might have to approach the hydrogen capture a little bit differently than in a beef rumen community.”</p>



<p>Mackie envisions this initiative as the starting point of a long-term quest to tackle enteric methane. By the conclusion of the three-year project, the experts aim to pinpoint precise inhibitor dosages that either maintain or even bolster production capacities.</p>



<p>“What we’d like is to have ruminants save the planet within 10 years. That would be amazing,” Mackie concluded.</p>



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<p>.</p>

Greener cattle: Seeking ways to inhibit methane production in cows

As our planet faces escalating challenges from global warming, a...

<p>A team of researchers led by Dartmouth College has recently used an innovative approach to solve the longstanding debate about what caused the mass <a href="https://www.earth.com/news/dinosaurs-were-in-a-state-of-decline-before-their-extinction/">extinction</a> of dinosaurs and many other species 66 million years ago: Did a colossal asteroid strike or volcanic eruptions lead to their demise? </p>



<p>To remove potential biases, the experts took the scientists out of the equation and put the decision-making in the hands of computers.</p>



<h2 class="wp-block-heading" id="h-interconnected-processors">Interconnected processors</h2>



<p>The novel modeling technique they used employed interconnected processors to sift through extensive geological and climate data autonomously.&nbsp;</p>



<p>The processors were given the task of retroactively examining the fossil record to identify the sequences and conditions that culminated in the Cretaceous–Paleogene (K–Pg) extinction event. This event set the stage for mammals, including primates and eventually early humans, to rise.</p>



<h2 class="wp-block-heading" id="h-focus-of-the-study">Focus of the study</h2>



<p>“Part of our motivation was to evaluate this question without a predetermined hypothesis or bias,” said lead author Alex Cox, a graduate student in Earth Sciences at Dartmouth.&nbsp;</p>



<p>“Most models move in a forward direction. We adapted a carbon-cycle model to run the other way, using the effect to find the cause through statistics, giving it only the bare minimum of prior information as it worked toward a particular outcome. In the end, it doesn’t matter what we think or what we previously thought - the model shows us how we got to what we see in the geological record.”</p>



<p>This computational model tested over 300,000 potential scenarios spanning a million years around the K–Pg extinction, factoring in variables like carbon dioxide and sulfur dioxide emissions and biological productivity.&nbsp;</p>



<h2 class="wp-block-heading" id="h-machine-learning">Machine learning</h2>



<p>Relying on a machine learning technique known as the Markov Chain Monte Carlo, the processors functioned collaboratively yet independently, continuously refining their findings until a conclusion was reached that aligned with fossil records.</p>



<p>The traces left behind in fossils distinctly portray the catastrophic environment during the K–Pg extinction. There were significant ecological disruptions as food chains crumbled amidst an atmosphere that oscillated drastically due to airborne pollutants.</p>



<h2 class="wp-block-heading" id="h-what-caused-the-dinosaur-extinction">What caused the dinosaur extinction?</h2>



<p>While the evidence of this devastation is clear, the root cause remains a topic of debate. Initial theories that pointed to volcanic eruptions have been overshadowed by the discovery of the Chicxulub impact crater in Mexico, attributed to a massive asteroid believed to be the primary catalyst for the dinosaur extinction.&nbsp;</p>



<p>However, recent findings suggest the asteroid might have struck an Earth already destabilized by powerful volcanic eruptions in India’s Deccan Traps.</p>



<p>Yet, there is still uncertainty about the relative contributions of each event to the extinction. This drove Cox and his advisor, Brenhin Keller, a Dartmouth assistant professor of Earth Sciences and co-author of the study, to “see what you would get if you let the code decide.”</p>



<h2 class="wp-block-heading" id="h-the-deccan-traps">The Deccan Traps</h2>



<p>Their model indicates that the emissions from the Deccan Traps could have alone instigated the global extinction. The Deccan eruptions began approximately 300,000 years before the asteroid’s impact, releasing staggering amounts of gases over nearly a million years.</p>



<p>“We’ve known historically that volcanoes can cause massive extinctions, but this is the first independent estimation of volatile emissions taken from the evidence of their environmental effects,” Keller explained.&nbsp;</p>



<p>“Our model worked through the data independently and without human bias to determine the amount of carbon dioxide and sulfur dioxide required to produce the climate and carbon cycle disruptions we see in the geologic record. These amounts turned out to be consistent with what we expect to see in emissions from the Deccan Traps.”&nbsp;</p>



<h2 class="wp-block-heading" id="h-surge-in-gas-emissions-nbsp">Surge in gas emissions&nbsp;</h2>



<p>While the model recognized a significant decline in organic carbon accumulation in deep-sea regions around the Chicxulub impact timeframe, it revealed no surge in gas emissions during the period, implying that the asteroid’s role in the extinction wasn’t primarily linked to gas emissions.</p>



<p>Comparing historical events to modern times, Cox noted that between 2000 and 2023, fossil fuel burning released roughly 16 billion tons of carbon dioxide annually, a rate 100 times more intense than the Deccan Traps’ highest yearly emissions. However, it would still take millennia for current emission levels to equal the total output of these ancient eruptions.</p>



<h2 class="wp-block-heading" id="h-impressive-results">Impressive results</h2>



<p>“Most heartening is that the results we achieved are broadly physically plausible, which is impressive given that the model could have technically run completely wild without stronger prior constraints,” Cox said.</p>



<p>The integration of processors sped up the data analysis, trimming what could have taken years down to mere hours. This method developed by Cox and Keller can be applied to other earth systems models, enabling researchers to delve deeper into well-documented geological events where the outcomes are clear but the preceding conditions remain elusive.</p>



<p>“This type of parallel inversion hasn't been done in earth sciences models before. Our method can be scaled up to include thousands of processors, which gives us a much broader solution space to explore, and it’s quite resistant to human bias,” remarked Cox.</p>



<p>“So far, people in our field have been more fascinated by the novelty of the method than the conclusion we reached. Any earth system for which we know the effect but not the cause is ripe for inversion. The better we know the output, the better we’re able to characterize the input that caused it.”</p>



<p>The study is published in the journal <a href="http://dx.doi.org/10.1126/science.adh3875" target="_blank" rel="noreferrer noopener"><em>Science</em></a><em>.</em></p>



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Violent volcanic eruptions likely caused dinosaur extinction

A team of researchers led by Dartmouth College has recently...

<p>Experts have identified a fascinating new species of dinosaur, Garumbatitan morellensis, which inhabited the Iberian Peninsula approximately 122 million years ago during the Early Cretaceous period.&nbsp;</p>



<p>The remains were uncovered in the Morella region of Spain, highlighting the region's significant contribution to the understanding of dinosaur diversity in Europe. Sedimentary deposits in this region have been found to contain an abundant record of dinosaurs from the Early <a href="https://www.earth.com/news/scientists-shed-new-light-on-europes-enigmatic-dinosaurs/" target="_blank" rel="noreferrer noopener">Cretaceous</a>.</p>



<h2 class="wp-block-heading" id="h-new-cretaceous-dinosaur">New Cretaceous dinosaur</h2>



<p>Garumbatitan morellensis belongs to the <a href="https://www.earth.com/news/new-species-of-sauropod-dinosaur-discovered/">sauropod</a> group, characterized by their immense size, quadrupedal stature, herbivorous diet, and distinctive long necks and tails.&nbsp;</p>



<p>The new dinosaur was identified by a team of Spanish and Portuguese paleontologists, whose findings were recently published in the <a href="http://dx.doi.org/10.1093/zoolinnean/zlad124" target="_blank" rel="noreferrer noopener"><em>Zoological Journal of the Linnean Society</em></a>.&nbsp;</p>



<h2 class="wp-block-heading" id="h-historical-significance">Historical significance</h2>



<p>Morella has a history of significant fossil discoveries, with the region yielding some of Spain's first dinosaur fossils. In recent years, there has been an upsurge in the discovery of relevant Mesozoic vertebrate fossils, including a notable collection of ornithopod dinosaurs like Morelladon beltrani and other sauropods.</p>



<p>One of the unique aspects of Garumbatitan morellensis is its distinct anatomical characteristics, separating it from other known sauropods. Its femur shares similarities with those of later sauropods from the Late Cretaceous, while the elements forming the foot exhibit unique morphologies.</p>



<p>“One of the individuals we found stands out for its large size, with vertebrae more than one meter wide, and a femur that could reach two meters in length," said Pedro Mocho, a paleontologist at the <a href="https://www.ulisboa.pt/en" target="_blank" rel="noreferrer noopener">University of Lisbon</a>. "We found two almost complete and articulated feet in this deposit, which is particularly rare in the geological record."</p>



<h2 class="wp-block-heading" id="h-evolutionary-implications">Evolutionary implications</h2>



<p>“Our study highlights the enormous complexity of the evolutionary history of sauropods from the European Cretaceous - in particular, from the Iberian Peninsula, with species related to lineages present in Asia and North America, as well as some groups related to forms from the African continent. Our results suggest the existence of periods of faunal dispersal between these continents," explained Pedro Mocho.&nbsp;</p>



<p>“The future restoration of all fossil materials found in this deposit will add important information to understand the initial evolution of this group of sauropods that dominated dinosaur faunas during the last million years of the Mesozoic era," noted study co-author Francisco Ortega of the Universidad Nacional de Educación a Distancia (UNED).</p>



<h2 class="wp-block-heading" id="h-garumbatitan-morellensis">Garumbatitan morellensis</h2>



<p>The name Garumbatitan morellensis carries significant meaning. “Garumbatitan” translates to “the giant of Garumba,” referencing the base of Mola de la Garumba where the specimen was found.&nbsp;</p>



<p>Meanwhile, “morellensis” pays homage to the location of the deposit, Morella. These fossil remains are now part of the extensive collection of the Iberian Mesozoic at the Temps Museum of Dinosaurs in Morella, contributing to the Valencian Community Museum Network’s offering.</p>



<h2 class="wp-block-heading" id="h-study-implications-nbsp">Study implications&nbsp;</h2>



<p>The introduction of Garumbatitan morellensis to the scientific community not only emphasizes the rich dinosaur diversity in the Early Cretaceous but also provides crucial insights into their evolutionary history.&nbsp;</p>



<p>With the promise of future restoration and study of these fossils, the discovery may ultimately help to clarify the initial evolution of the sauropod group that dominated the dinosaur landscape of the Mesozoic era.</p>



<h2 class="wp-block-heading" id="h-more-about-the-cretaceous-period">More about the Cretaceous period</h2>



<p>The Cretaceous period spanned from approximately 145 to 66 million years ago. It ushered in a diverse array of dinosaurs that dominated the land, air, and sea. This era, last of the three periods of the Mesozoic Era, saw the rise of iconic dinosaurs like the <a href="https://www.earth.com/news/an-estimated-2-5-billion-tyrannosaurus-rexes-lived-and-died-on-earth/" target="_blank" rel="noreferrer noopener">Tyrannosaurus rex</a>, the <a href="https://www.earth.com/news/triceratops-horns-attract-mates/" target="_blank" rel="noreferrer noopener">Triceratops</a>, and as mentioned above, <em>Garumbatitan morellensis</em>. The Cretaceous ended with one of the most significant mass extinction events in Earth's history.</p>



<h3 class="wp-block-heading">Diversity and adaptation</h3>



<p>Cretaceous dinosaurs exhibited remarkable diversity and adaptability, populating every continent and evolving a myriad of forms, sizes, and ecological roles. Small, feathered theropods like Velociraptor roamed the lands, showcasing the link between dinosaurs and modern birds. Larger predators like Spinosaurus, with its distinctive sailback, pursued prey in aquatic environments.</p>



<h3 class="wp-block-heading">Herbivorous giants</h3>



<p>Massive herbivores such as the long-necked sauropods also marked the landscapes of the Cretaceous. Titanosaurs, the last surviving group of long-necked sauropods, roamed the Southern Hemisphere, revealing the evolutionary success of herbivorous dinosaurs. Triceratops, recognized by their prominent frills and horns, browsed the lush vegetation. They represented a group of herbivorous dinosaurs known as ceratopsians.</p>



<h3 class="wp-block-heading">Flora and climate</h3>



<p>Rich and diverse flora characterized the Cretaceous landscapes. Flowering plants, or angiosperms, made their first appearance, rapidly diversifying and providing new food sources for herbivorous dinosaurs. The global climate was warmer, with higher sea levels creating shallow seas and dividing continents. These conditions shaped the distinct dinosaur faunas in different regions.</p>



<h3 class="wp-block-heading">Birds and flight</h3>



<p>The Cretaceous period witnessed the evolutionary transition from non-avian dinosaurs to birds. Archaeopteryx, often regarded as the first bird, illustrated the morphological changes from theropod dinosaurs to modern avian species. Pterosaurs, with their membranous wings, dominated the skies, showcasing various adaptations for flight and feeding.</p>



<h3 class="wp-block-heading">Cretaceous–Paleogene extinction event</h3>



<p>The fascinating journey of the Cretaceous dinosaurs concluded with the <a href="https://www.earth.com/news/natures-true-survivors-flowering-plants-lived-through-the-dinosaur-extinction/" target="_blank" rel="noreferrer noopener">Cretaceous–Paleogene extinction event</a> around 66 million years ago. A colossal asteroid impact, combined with extensive volcanic activity, dramatically altered the Earth’s climate. This ultimately led to the demise of the non-avian dinosaurs. The remnants of this impact form the Chicxulub crater, located on the Yucatán Peninsula.</p>



<p>In summary, the Cretaceous period illuminates the adaptability and diversity of dinosaurs in a dynamically changing world. The dinosaurs of this era, from the fearsome T. rex to the soaring Pterosaurs to <em>Garumbatitan morellensis</em>, showcase the evolutionary innovations and ecological roles that these creatures occupied. </p>



<p>The advancements in paleontology continue to uncover new dinosaur species and provide deeper insights into their lives, behaviors, and environments. This ongoing research enhances our understanding of the intricate tapestry of life during the Cretaceous period. The fossil record from this time not only serves as a window into our planet’s past, but also as a reminder of the ever-present possibility of change and adaptation in the natural world.</p>



<p>---</p>



<p><em>Image Credit: Grup Guix</em></p>



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Massive new dinosaur discovered in Spain's Early Cretaceous fossil collection

Experts have identified a fascinating new species of dinosaur, Garumbatitan...

<p>Were the earliest forms of animals more inclined towards a predatory nature or passive filtering like sponges?&nbsp;</p>



<p>A new study on sea anemones may offer some answers. The research indicates that the evolution of sea anemones, and potentially the early evolution of multicellular <a href="https://www.earth.com/news/organisms-can-thrive-on-the-seafloor-in-extreme-heat/">organisms</a>, was significantly shaped by a predatory lifestyle.</p>



<h2 class="wp-block-heading" id="h-predatory-larvae">Predatory larvae</h2>



<p>The study, which was led by Dr Thomas W. Holstein of Heidelberg University, was focused on the young life stages or larvae of the Aiptasia sea anemone.&nbsp;</p>



<p>Contrary to previous beliefs, these larvae actively hunt and feed on live prey. They do not rely on algae as previously thought. Using specialized stinging cells and a rudimentary neuronal network, these larvae capture and devour their prey.</p>



<p>“In its simplest form, the gastrula develops from a hollow sphere of cells, the blastula, forming a larval stage with gut and mouth; imagine pushing a ball inwards at one side. All animals pass through this gastrula stage, which could also have existed at the beginning of animal evolution,” said Dr. Holstein.</p>



<h2 class="wp-block-heading" id="h-a-model-organism-nbsp">A model organism&nbsp;</h2>



<p>The Aiptasia sea anemone holds significance as a model for researching endosymbiosis in corals and other cnidarians.</p>



<p>“Corals live in nutrient-poor waters and as larvae or young polyps, take up symbiotic algae cells. In Aiptasia, however, this process is important for adults but does not lead to growth and settlement of the larvae, suggesting that nutrition is a critical step in closing the life cycle,” said Dr. Holstein.&nbsp;</p>



<p>Ira Mägele, a member of the research group, provided crucial evidence. She found that even in the late gastrula stage, Aiptasia larvae actively use their stinging cells to hunt prey that matches their size, subsequently consuming and digesting them.</p>



<h2 class="wp-block-heading" id="h-relevance-of-aiptasia-nbsp">Relevance of Aiptasia&nbsp;</h2>



<p>While corals, especially in nutrient-deficient waters, absorb symbiotic algae cells during their larvae or young polyp stages, Aiptasia doesn't show this reliance during their larval phase.&nbsp;</p>



<p>According to the researchers, lab studies of the nutritional conditions showed that the food for the tiny Aiptasia larvae had to be small enough and alive. Nauplius larvae of Tisbe copepods are 50 to 80 micrometers - a similar size to Aiptasia larvae - making them an ideal food.</p>



<p>Under these conditions, larvae grew consistently, later settling and undergoing metamorphosis into primary polyps.</p>



<p>“In this way, we were able to grow mature polyps as well as their descendants for the first time,” explained Mägele.&nbsp;</p>



<p>“By thus closing the life cycle of Aiptasia, it will finally be possible to carry out necessary molecular genetic experiments required for functional studies on this key endosymbiotic model organism," noted study&nbsp;co-author Dr. Elizabeth Hambleton.</p>



<h2 class="wp-block-heading" id="h-redefining-the-gastrula-hypothesis">Redefining the gastrula hypothesis</h2>



<p>Dr. Holstein's findings challenge the long-standing gastrula hypothesis first proposed by evolutionary theorist Ernst Haeckel in the 19th century. While Haeckel imagined the gastrula as a passive, particle-filtering entity similar to sponges, the Aiptasia gastrula tells a different story. It showcases a predatory lifestyle with specialized stinging cells tailored for hunting.</p>



<p>This predatory nature, which is also found in some single-celled organisms and simple worms, might have been pivotal in the evolution of multicellular organisms, potentially even spurring the development of sophisticated nervous systems.</p>



<p>The study is published in the journal <a href="http://dx.doi.org/10.1073/pnas.2311872120"><em>PNAS</em></a><em>.</em></p>



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Did early animal evolution start with predatory behavior?

Were the earliest forms of animals more inclined towards a...

<p>Periodontal disease is a prevalent issue among canines, impacting at least 80 percent of <a href="https://www.earth.com/news/typical-american-dog-knows-18-words-and-love-is-at-the-top-of-the-list/">dogs</a> over the age of three. The disease begins with gingivitis, characterized by red, inflamed gums that may bleed.&nbsp;</p>



<p>If untreated, the condition escalates to periodontitis, leading to progressive alveolar bone damage and potential tooth loss, while also increasing the risk of cardiovascular and lung diseases.</p>



<h2 class="wp-block-heading" id="h-oral-hygiene-nbsp">Oral hygiene&nbsp;</h2>



<p>With poor oral hygiene identified as a principal cause of periodontal disease, leading to plaque and tartar build-up, regular teeth brushing for dogs is advised by veterinarians.&nbsp;</p>



<p>However, many people do not comply with this advice, often because their dogs will not cooperate.</p>



<h2 class="wp-block-heading" id="h-reducing-plaque-and-tartar">Reducing plaque and tartar</h2>



<p>Dr. Jerzy Gawor is a veterinary dentistry practitioner and researcher at the Arka Veterinary Clinic in Krakow, Poland, and lead author of a new study published in the journal <a href="http://dx.doi.org/10.3389/fvets.2023.1241197" target="_blank" rel="noreferrer noopener"><em>Frontiers in Veterinary Science</em></a>.&nbsp;</p>



<p>“Here we show that an additive to drinking water, based on pomegranate extract, can reduce the accumulation of plaque and tartar in dogs,” said Dr. Gawor. “This additive thus helps dogs to maintain healthy gums, and may ultimately help to limit the occurrence of periodontal disease.”</p>



<p>The researchers examined Vet Aquadent® FR3SH™ - an over-the-counter oral hygiene product developed by French veterinary company Virbac.&nbsp;</p>



<p>“We did this study after obtaining evidence that the main ingredient, pomegranate extract, limits the growth of oral bacteria in dogs in vitro, including species involved in periodontal disease," said study co-author Dr. Celine Nicolas, an employee of Virbac.</p>



<p>"There was also evidence that the other components, inulin and erythritol, likewise play a role in the maintenance of a healthy oral microbiome in dogs."</p>



<h2 class="wp-block-heading" id="h-focus-of-the-study">Focus of the study</h2>



<p>The product, which can be easily added to dogs’ drinking water, was tested on 40 dogs representing 14 breeds. All subjects had mild to moderate gingivitis but were otherwise healthy.</p>



<p>The dogs were monitored over 30 days after a professional dental cleaning session. The research involved thorough oral health assessments, dental charting, and mouth radiography under general anesthesia.</p>



<p>Dogs were then divided into two groups: one receiving water with a 1% solution of Vet Aquadent® FR3SH™ daily, and the other receiving plain water. During the study, no other oral hygiene practices were implemented.</p>



<h2 class="wp-block-heading" id="h-results-of-the-study">Results of the study</h2>



<p>After 30 days, dogs receiving the pomegranate extract additive had a 47 percent reduction in plaque and a 24 percent decrease in tartar. Furthermore, the gums of dogs in the treatment group were completely healthy.&nbsp;</p>



<p>“The results showed that 30 days after the dental cleaning and polishing, dogs which had received the additive daily scored 47% lower for the amount of plaque, and had a 24% lower score for the amount of tartar, compared to dogs in the control group. The gum was also completely healthy in the active treatment group,” wrote the study authors.&nbsp;</p>



<h2 class="wp-block-heading" id="h-healthier-dog-teeth">Healthier dog teeth</h2>



<p>The study thus affirmed that the additive effectively limits plaque and tartar reformation post professional dental cleaning.&nbsp;</p>



<p>Dr. Gawor and team suggest that the product works by restricting the growth of harmful bacteria, especially preventing bacterial biofilms formation.</p>



<p>"Daily oral hygiene and prophylaxis are essential to prevent periodontal diseases in dogs. This includes active methods like brushing, passive methods like dental chews or water additives, or a combination, as well as regular clinical dental checks," said Dr. Gawor.</p>



<p>"The frequency of the latter should depend on the dog’s age, breed, size, and predisposition, as determined by veterinary clinicians."</p>



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Mouthwash with pomegranate helps prevent gum disease in dogs

Periodontal disease is a prevalent issue among canines, impacting at...

<p>Scientists have recently uncovered remnants of DNA within the fossilized remains of a <a href="https://www.earth.com/news/fossilized-sea-turtle-flattened-dinosaur/">sea turtle</a>, closely related to contemporary Kemp’s ridley and olive ridley turtles, dating back six million years.&nbsp;</p>



<p>This finding marks one of the infrequent instances where genetic material has been identified in ancient vertebrate fossils. The study is published in the <a href="http://dx.doi.org/10.1080/02724634.2023.2254356" target="_blank" rel="noreferrer noopener"><em>Journal of Vertebrate Paleontology</em></a><em>.</em></p>



<h2 class="wp-block-heading" id="h-bone-cells-nbsp">Bone cells&nbsp;</h2>



<p>The fossil, discovered along the Caribbean coast of Panama in 2015, presented notably well-preserved bone cells, known as osteocytes.&nbsp;</p>



<p>Though the fossil is incomplete, featuring a relatively intact carapace - the turtle’s shell - but lacking the rest of the skeleton, researchers estimate the turtle would have measured about a foot (30 cm) in length during its lifetime.</p>



<h2 class="wp-block-heading" id="h-dna-remnants">DNA remnants</h2>



<p>In some of these osteocytes, the cell nuclei remained intact and responded to a specific chemical solution. This reaction allowed the scientists to detect the remnants of DNA, essential for an organism’s development and functioning, explained study lead author Edwin Cadena, a paleontologist at the Universidad del Rosario in Bogota and the Smithsonian Tropical Research Institute.</p>



<p>“I want to point out that we did not extract DNA, we only were able to recognize the presence of DNA traces in the nuclei,” Cadena said.&nbsp;</p>



<p>Given its perishable nature, DNA preservation in ancient remains is rare, but not unprecedented, with discoveries of DNA remnants dating back to around two million years in some ancient specimens from Greenland.</p>



<p>The only vertebrate fossils older than the newly studied turtle and showing similar DNA remnants belonged to two dinosaurs – Tyrannosaurus, from around 66 million years ago, and Brachylophosaurus, from about 78 million years ago. DNA remnants have also been reported in insects dating back tens of millions of years.</p>



<h2 class="wp-block-heading" id="h-evolutionary-history-nbsp">Evolutionary history&nbsp;</h2>



<p>The turtle in question belongs to the genus Lepidochelys, which includes two of the seven existing sea turtle species – the Kemp’s ridley, primarily found in the Gulf of Mexico, and the more widespread olive ridley.&nbsp;</p>



<p>This fossil is pivotal in shedding light on the evolutionary history of this genus, which remains largely unclear.&nbsp;</p>



<p>Due to the incomplete nature of the remains, the researchers have refrained from identifying the turtle by its species.</p>



<h2 class="wp-block-heading" id="h-biomolecular-remains-nbsp">Biomolecular remains&nbsp;</h2>



<p>“Each fossil, each fossil site has specific conditions of preservation that in some cases could have favored preservation of original biomolecular remains such as proteins and DNA," said Cadena.</p>



<p>"Maybe in the future and with more studies of this kind, we could be able at some point to sequence very small pieces of DNA and to infer things about their close relatives or involve that information in a broader molecular evolutionary study."</p>



<h2 class="wp-block-heading" id="h-ridley-turtles-nbsp">Ridley turtles&nbsp;</h2>



<p>Ridley turtles, specifically those in the Lepidochelys genus, are known for their relatively small size compared to other sea turtles and unique nesting habits.</p>



<p>There are two species within this genus: the Kemp's ridley turtle (Lepidochelys kempii) and the olive ridley turtle (Lepidochelys olivacea).</p>



<h3 class="wp-block-heading" id="h-size">Size</h3>



<p>Ridley turtles are among the smallest sea turtles, with adults usually weighing between 75 and 100 pounds.</p>



<h3 class="wp-block-heading" id="h-shell">Shell</h3>



<p>Their carapace (upper shell) is broad and somewhat heart-shaped, typically olive-green in Kemp’s ridleys and grayish-green in olive ridleys.</p>



<h3 class="wp-block-heading" id="h-limbs">Limbs</h3>



<p>They possess flippers with clawless tips, which are adapted for swimming in open oceans.</p>



<h3 class="wp-block-heading" id="h-habitat-and-distribution">Habitat and distribution</h3>



<p>Kemp's ridley is primarily found in the Gulf of Mexico and along the Atlantic coast of North America. These turtles prefer coastal habitats like bays, estuaries, and lagoons.</p>



<p>Olive ridley is found in tropical regions of the Pacific, Atlantic, and Indian Oceans. They are often found in open waters but migrate to coastal areas for nesting.</p>



<h3 class="wp-block-heading" id="h-nesting">Nesting</h3>



<p>One notable behavior of ridley turtles is “arribada,” a mass nesting phenomenon where thousands of females come ashore simultaneously to lay eggs.&nbsp;</p>



<p>Olive ridley turtles are particularly known for this behavior, with significant arribada events occurring in places like Ostional, Costa Rica.</p>



<h3 class="wp-block-heading" id="h-diet">Diet</h3>



<p>Ridley turtles are omnivores, consuming a variety of food items, including crabs, shrimp, mollusks, jellyfish, and occasionally algae and seaweed.</p>



<h3 class="wp-block-heading" id="h-conservation-status">Conservation status</h3>



<p>Both species of ridley turtles are listed under the IUCN Red List. Kemp's ridley is classified as critically endangered, with major threats including habitat loss, accidental capture in fishing gear (bycatch), and climate change affecting their nesting sites.</p>



<p>Olive ridley is listed as vulnerable, facing threats like illegal egg collection, bycatch, and habitat destruction.</p>



<h3 class="wp-block-heading" id="h-conservation-efforts-nbsp">Conservation efforts&nbsp;</h3>



<p>Various conservation programs and legal protections are in place to help conserve ridley turtles, such as:</p>



<ul>
<li>Establishing protected areas and wildlife refuges.</li>



<li>Implementing regulations and initiatives to reduce bycatch.</li>



<li>Engaging in public education and awareness campaigns.</li>
</ul>



<h3 class="wp-block-heading" id="h-arribadas-nbsp">Arribadas&nbsp;</h3>



<p>The synchronized nesting events, or arribadas, are crucial for the survival of these species as it overwhelms predators, ensuring that more hatchlings can safely reach the ocean.</p>



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DNA remnants found in six million-year-old sea turtle

Scientists have recently uncovered remnants of DNA within the fossilized...

Dentalium caledonicum

Taxonomic tree: