Megadytes ducalis

Description

Megadytes ducalis is a species of water beetle in the family Dytiscidae. With a length of 4.75 cm (1.9 in), it is the largest species in the family. The species is only known from a single specimen that was collected in the 1800s from an unknown locality in Brazil, although rumors indicate it was found in the bottom of a canoe in the Amazon. As a consequence of the lack of recent records, the IUCN lists it as extinct. Considering the almost complete absence of information about the species (even the location where the type was collected) and the limited studies conducted on water beetles in Brazil, it might still survive.