BIO 2135 Study Guide - Final Guide: Ordovician, Proventriculus, Monophyly

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Anapsids, bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation: the air sacs expand and contract in birds rather than the lungs, one of the extraembryonic membranes found in the amniote animals, the allantois contains the metabolic wastes created by the developing embryo, may also be involved in gas exchange and is important in forming the placenta in placental mammals, one of the extraembryonic membranes found in terrestrial vertebrate, the amnion is filled with fluid and the developing embryo of reptiles, birds, and mammals develops suspended inside the amnion, eggs that shelter the developing embryo in a water filled sac the amnion. This is a characteristic of the amniote animals, which include reptiles, birds, and mammals: the type of skull found in reptiles and seen today only in turtles, behind the opening of the orbits the skull is solid and lacks temporal openings found in other amniote.

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