Shuvo's lizard
shuvosaurus latin

Shuvosaurus (meaning "Shuvo's lizard") is a genus of beaked reptile from the Late Triassic of Texas.

Other genera such as Sillosuchus and Shuvosaurus were later erected.

Like Poposaurus, Shuvosaurus was originally thought to be a theropod dinosaur.

Edentulism is also seen in Shuvosaurus and Effigia, which have beak-like jaws.

Other members of the clade include Shuvosaurus, Poposaurus and Effigia.

Shuvosauridae was named by Sankar Chatterjee in 1993 to include the genus Shuvosaurus.

Contemporaries of Gojirasaurus included the pseudosuchian Shuvosaurus, and the phytosaur Rutiodon.

Group Y falls within Group X to include Sillosuchus, Shuvosaurus, and Effigia.

Furthermore, in 2006 Nesbitt and Norell argued that Chatterjeea is a junior synonym of Shuvosaurus.

According to Long and Murry, Chaterjee's Postosuchus material included bones of Poposaurus and Shuvosaurus, giving the impression that it was a poposauroid.

They noted similarities to Silesaurus in the jaw fragments Sereno had excluded, and themselves excluded the posterior fragment as actually belonging to the unusual rauisuchian Shuvosaurus.

In 2007, Lucas and others suggested "Effigia" was synonymous with "Shuvosaurus" and used the new combination "Shuvosaurus okeeffeae" for the animal.

However, the recent discovery of the related Effigia from Ghost Ranch shows that Shuvosaurus is more closely related to crocodilians, and that similarities between this animal and ornithomimids result from convergent evolution.

In a 2007 study Chatterjeea was demonstrated to be a junior synonym of Shuvosaurus, and the therein cladistic analysis found that Shuvosaurus, Effigia and Sillosuchus all form a closely related group.

Nesbitt also demonstrated that Shuvosaurus was the same animal as Chatterjeea, and that it belonged to an exclusive clade containing closely related suchians such as Shuvosaurus and Poposaurus (Poposauridae).

In a study of the ctenosauriscid Arizonasaurus, paleontologist Sterling Nesbitt defined a clade of rauisuchians called "Group X." This group includes Arizonasuchus, Lotosaurus (another ctenosauriscid), and Sillosuchus, Shuvosaurus, and Effigia (all poposaurids).

Nesbitt, in 2007, showed that Effigia was very similar to Shuvosaurus, and is definitely a member of the crurotarsan group Suchia (in the line leading towards modern crocodilians), and that its similarity to ornithomimids represents a case of "extreme" convergent evolution.