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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 ...
Lizard morphological and ecological diversity substantially increased over the course of the Cretaceous. [54] In the Palaeogene, lizard body sizes in North America peaked during the middle of the period. [55] Mosasaurs likely evolved from an extinct group of aquatic lizards [56] known as aigialosaurs in the Early Cretaceous.
Ascendonanus was about 40 cm long, although the end of the tail is missing in all specimens and the full body length in life is not currently known. It is the smallest known member of the clade Varanopidae, a group of early synapsids that generally resembled the unrelated monitor lizards.
The eastern blue-tongue lizard has smooth skin covered with scales that overlap and have small bone plates. [2] The ventral (abdominal) region of the lizard is a silver or gray color. The lizard's back, however, appears dark brown and cream-colored and its head is pale brown. [5] Across its body, the eastern-blue-tongued lizard has broad black ...
The body is laterally compressed, and is covered with imbricate keeled scales. A strong transverse gular fold is present, but a gular pouch is absent. The limbs are very long, and the infradigital lamellae have a median tubercle-like keel. Femoral pores are absent. The tail is very long, and is round in cross section.
Females are generally 135 to 194 g (4.8 to 6.8 oz), and weigh half as much as males. The tail comprises 70 to 75% of the total length: for example, a 70-cm-long (27.5-inch-long) common basilisk would have a 50-cm-long (19.5-inch-long) tail. The common basilisk has a large mouth with saw-like teeth on the inner sides of the jaw.
Other common names for P. fasciatus include blue-tailed skink (for juveniles) and red-headed skink (for adults). It is technically appropriate to call it the American five-lined skink to distinguish it from the African skink Trachylepis quinquetaeniata (otherwise known as five-lined mabuya) or the eastern red-headed skink to distinguish it from its western relative Plestiodon skiltonianus ...
Tuatara are greenish brown and grey, and measure up to 80 cm (31 in) from head to tail-tip and weigh up to 1.3 kg (2.9 lb) [10] with a spiny crest along the back, especially pronounced in males. They have two rows of teeth in the upper jaw overlapping one row on the lower jaw, which is unique among living species.