Drepanosaurus

Drepanosaurus Temporal range: Late Triassic
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Node:	†Drepanosauromorpha
Family:	†Drepanosauridae
Node:	†Megalancosaurinae
Genus:	†Drepanosaurus Pinna, 1979
Species:	†Drepanosaurus unguicaudatus Pinna, 1979

Drepanosaurus is a genus of arboreal (tree-dwelling) reptile that lived during the Triassic Period. Only one specimen of Drepanosaurus has thus far been found. Sadly this specimen was incomplete and lacked a head and neck. Drepanosaurus was probably an insectivore, and lived in a coastal environment in what is now modern Italy.

Drepanosaurus

Anatomy

A full sized adult Drepanosaurus had a length of about half a meter. Its name means "scythe lizard", which is thought to refer either to the enlarged claw on its forelimb, or the claw-like structure at the tip of its prehensile tail. The structure at the end of the tail is made of fused vertebrae.

The forelimb of Drepanosaurus is QUITE highly modified compared to other vertebrates and very robust. Its ulna was altered from being a forearm bone into an odd crescent shaped site for muscle attachment. The role played by the ulna in most tetrapods is replaced by an elongated carpal bone. Additional musculature would be attached to the high withers that characterized Drepanosaurus and its close relatives.

A clue to the purpose of these large muscles can be found on its hand. The animal's "index finger" bore a large claw reminiscent of those born by dinosaurs such as Noasaurus and Baryonyx. However it is more likely that Drepanosaurus used its claw like the modern pygmy anteater, tearing through bark and insect nests to find invertebrate prey. Some researchers have forwarded the more far-fetched proposal that the claw was used to excavate burrows, but this is unlikely.

External links

• Hairy Museum of Natural History page on simosaurs

Paleontology portal