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A modern semi-aquatic lizard: the marine iguana Modern squamates which have made their own adaptions to allow them to spend significant time in the ocean include marine iguanas and sea snakes . Sea snakes are extensively adapted to the marine environment, giving birth to live offspring and are largely incapable of terrestrial activity.
This list is incomplete; you can help by adding missing items. ( April 2018 ) The page lists all of the families in the clade Tetrapoda , organized by taxonomic ranks .
In biology, being semi-aquatic refers to various macro organisms that live regularly in both aquatic and terrestrial environments. When referring to animals , the term describes those that actively spend part of their daily time in water (in which case they can also be called amphibious ), or land animals that have spent at least one life ...
Such pressure is non-detectable in air, but grooves for the lateral line sense organs were found on the skull of early tetrapods, suggesting either an aquatic or largely aquatic habitat. Modern amphibians, which are semi-aquatic, exhibit this feature whereas it has been retired by the higher vertebrates.
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).
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes. [1] Tetrapods (under the apomorphy-based definition used on this page) are categorized as animals in the biological superclass Tetrapoda, which includes all living and extinct amphibians, reptiles, birds, and mammals.
Chroniosuchidae is a family of semi-aquatic tetrapods found in sediments from the upper Permian and the upper Triassic periods, most in Russia.They were generally rather large animals, with long jaws similar to those found in modern crocodiles, and probably lived a similar lifestyle as riverside piscivores and ambush predators.
Some of these tetrapods (e.g. Archeria, Eogyrinus) were elongate, eel-like aquatic forms with diminutive limbs, while others (e.g. Seymouria, Solenodonsaurus, Diadectes, Limnoscelis) were so reptile-like that until quite recently they actually had been considered to be true reptiles, and it is likely that to a modern observer they would have ...