The Animal Encyclopedia: Amniotes - Amniota.
Amniotes (Amniota) form a monophyletic group that encompasses the last common ancestor of living mammals and reptiles, and all descendents of that ancestor. They are characterised by the possession of an amniote egg (or at least amniotic membranes in live-bearers) that contains the essentials for embryo development, but is protected by a leathery or calcareous outer shell. This key innovation.
Amniota tetrapodo ornodunen talde bat da. Lehorrean bizitzeko arrautza garatu dute. Gaur egungo animalien artean synapsidoak (), sauropsidoak (narrasti eta hegaztiak) eta euren arbaso fosilak biltzen ditu. Enbrioia arrautza batean doa edo emeak garraiatzen du eta hainbat mintzaz babestua hazten da. Eutheriaren barruan (gizakia, adibidez) mintza hauek umekia babesten duen poltsa amniotikoa izan.
Amniote definition is - any of a group (Amniota) of vertebrates that undergo embryonic or fetal development within an amnion and include the birds, reptiles, and mammals.
Amniote definition, any vertebrate of the group Amniota, comprising the reptiles, birds, and mammals, characterized by having an amnion during the embryonic stage. See more.
Introduction to the Amniota. Which came first, the chicken or the egg? Animals have been laying eggs for millions of years; snails, fish, and many other critters produce eggs from which their young hatch. The egg of the chicken is a special kind of egg. It has a shell to help prevent drying, and a series of membranes that surround the developing chick. This kind of egg is unique to the.
Amniota: Mammals. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. BaileyRitterMC. Terms in this set (63) what are the 2 clades of Tetrapods? Lissamphibia Amniota. How are Amniota characterized? amniotic eggs. An amniotic egg is surrounded by a what? shell. Is the shell a membrane? no. An amniotic shell has 4 membranes. Chorion Amnion Allantois Yolk sac. The.
Amniotes synonyms, Amniotes pronunciation, Amniotes translation, English dictionary definition of Amniotes. n. Any of numerous vertebrates of the group Amniota, characteristically having an amnion during embryonic development and including the reptiles, birds, and.