Whitetip reef shark

Description

A relatively small species,few whitetip reef sharks are longer than 1.6 m (5.2 ft).The maximum length this species attains is often given as 2.1 m (6.9 ft),though this was originally based on visual observations and may be dubious.The maximum reported weight is 18.3 kg (40 lb).The whitetip reef shark has a slim body and a short,broad head.The snout is flattened and blunt,with large flaps of skin in front of the nares that are furled into tubes.The eyes are small and oval with vertical pupils and prominent ridges above,and are often followed by a small notch.The mouth has a distinct downward slant (imparting a disgruntled expression to the shark),with short furrows at the corners.There are 42–50 tooth rows in the upper jaw and 42–48 tooth rows in the lower jaw.Each tooth has a single narrow,smooth-edged cusp at the center,flanked by a pair of much smaller cusplets.The first dorsal fin is positioned well back on the body,closer to the pelvic than the pectoral fins.The second dorsal and anal fins are large,about half to three-quarters as high as the first dorsal fin.The broad,triangular pectoral fins originate at or slightly before the level of the fifth gill slit.There is no ridge between the first and second dorsal fins.The lower lobe of the caudal fin is half the length of the upper,which has a strong notch near the tip.The dermal denticles are small and overlapping,usually with 7 horizontal ridges,giving the skin a smooth feel.The coloration is grayish to brownish above and white below,with a pattern of scattered small,dark spots unique to each individual.The tips of the first dorsal fin and upper caudal fin lobe,and sometimes also the second dorsal fin and lower caudal fin lobe,are bright white.