Amniotes Flashcards
what does amniotes mean?
amniotic membrane in eggs
what is a choronic egg
only one membrane alone with embryo and yolk
amniotic egg
mutimembrane egg with embryo and yolk
what are the 5 components to amniotic eggs
- chorion: outermsmbrane
- amnion: inner membrane
- allantois: sac of waste snd aid respiration
- yolk: in vitlan membrane
- embryo
general skeleton of aminotes
names the same as humans
just long caudal tail
general skull of amniotes
5 series of paired cranial bones
lateral tooth bearing series
- pre maxilla and maxilla
median series
- nasal, frontal, parietal & postparietal
circumorbital series
- lacrimal, jugal, prefrontal, postfrontal, postorbital
temporal series
- supra temporal and tabular
cheek series
- squmosal & quadratojugal
describe their skin
less Glands so they don’t worry about losing moisture
- thick epidermis
describe scales
made from epidermal scales
(keratin)
what other things are made from keratin
-nails
- horns
- skin
- hair
- scales
how often do aminotes molt
less than amphibians but have thicker layers when they do
what does bone fusion in ankle tell us?
that they needed greater support for motility