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An adult salamander generally resembles a small lizard, having a basal tetrapod body form with a cylindrical trunk, four limbs, and a long tail. Except in the family Salamandridae, the head, body, and tail have a number of vertical depressions in the surface which run from the mid-dorsal region to the ventral area and are known as costal ...
It was designed as a definitive work, covering all aspects of their biology and evolution, and as part of it every known species was re-evaluated and many of them redescribed. They agreed with prior authors on the semi-aquatic nature of hadrosaurs, but re-evaluated Cope's idea of weak jaws and found quite the opposite.
The first phytosaur species known to science was named Phytosaurus cylindricodon – "plant lizard with cylindrical teeth" – by G. Jaeger in 1828 because he mistakenly believed that petrified mud fillings in the jaw were herbivore teeth. The specimen is too poor to be diagnostic, and this species name is no longer valid.
The tall skull and round teeth of a Nile monitor Skull anatomy of Varanus exanthematicus (2nd row on the left) compared with other Varanoids White-throated monitor Nile monitor The genus Varanus is believed to have originated in South Asia , and the anatomy of its earliest members are thought to resemble modern members of Empagusia , such as ...
Skull diagram in top down and side-on views. Unlike the vast majority of lizards, the tuatara has a complete lower temporal bar closing the lower temporal fenestra (an opening of the skull behind the eye socket), caused by the fusion of the quadrate/quadratojugal (which are fused into a single element in adult tuatara) and the jugal bones of ...
The integument, or body covering, of Psittacosaurus is known from a Chinese specimen, SMF R 4970, which most likely comes from the Yixian Formation of Liaoning Province, China. The specimen, which is not yet assigned to any particular species, was likely illegally exported from China and was purchased in 2001 by the Senckenberg Museum in Germany .
Lizard is the common name used for all squamate reptiles other than snakes (and to a lesser extent amphisbaenians), encompassing over 7,000 species, [1] ranging across all continents except Antarctica, as well as most oceanic island chains.
It was a small, lizard-like animal, about 20 to 30 centimetres (7.9 to 11.8 in) long, with numerous sharp teeth indicating an insectivorous diet. [40] Other examples include Westlothiana (for the moment considered a reptiliomorph rather than a true amniote) [41] and Paleothyris, both of similar build and presumably similar habit.