EEB267H1 Lecture 12: The Amniota (Membranes Rule): Lectures 11 and 12
29 May 2017
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Document Summary
Eeb267 page 1 (hard and rigid e. g. in shells, horny claws) (soft and flexible e. g. in hair) The fluid-filled amniotic sac buffers the embryo from shock. Eeb267 page 2 expensive protein to produce stratum corneum stratum granulosum stratum spinosum stratum basale. Eeb267 page 4 (leather = skin filled with soft keratins) Eeb267 page 5 the rest of the carapace is is made of completely novel plates of bone. There"s just a shell, but it"s important that the thoracic cavity is attached to the shell so there"s something to pull against. Some, especially the soft- shelled pleurodira have very thin skin at the base of their arms and legs and under their necks. They can exchange gases gases through their skin as well. well. They cluster on the shore b/c they come out of the water to bask in the sun in limited areas. A bunch of tortoises are colonial, however e. g. pancake tortoises and gopher tortoises.
