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Synapsida [a] is a diverse group of tetrapod vertebrates that includes all mammals and their extinct relatives. It is one of the two major clades of the group Amniota, the other being the more diverse group Sauropsida (which includes all extant reptiles and birds).
Caimans also hunt insects, birds, small mammals and reptiles. Due to their large size and ferocious nature, caimans have few natural predators within their environments. Humans are their main predators, because the animals have been hunted for their meat and skin.
The decline in amphibian and reptile populations has led to an awareness of the effects of pesticides on reptiles and amphibians. [177] In the past, the argument that amphibians or reptiles were more susceptible to any chemical contamination than any land aquatic vertebrate was not supported by research until recently. [177]
Subclass Anapsida ("proto-reptiles", possibly including turtles) Subclass Diapsida (majority of reptiles, [32] progenitors of birds) Subclass Euryapsida (plesiosaurs, placodonts, and ichthyosaurs) Subclass Synapsida (stem or proto-mammals, progenitors of mammals) Class Aves (birds) Subclass Archaeornithes (reptile-like birds, progenitors of all ...
While reptiles and amphibians can be quite similar externally, the French zoologist Pierre André Latreille recognized the large physiological differences at the beginning of the 19th century and split the herptiles into two classes, giving the four familiar classes of tetrapods: amphibians, reptiles, birds and mammals.
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Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs.
Pleurodeles, including the Iberian ribbed newt, is the type genus of subfamily Pleurodelinae.. The Old English name of the animal was efte, efeta (of unknown origin), resulting in Middle English eft; this word was transformed irregularly into euft, evete, or ewt(e).