Mammals Flashcards
Are mammals the only synapsids?
Yes
What is endothermy?
High body temperature generated by heat produced by metabolism
What do these have in common: dimetrodon, dicynodonts, cynodonts, and gorgonopsians
They are non-mammalian synapsids
Indicators of endothermy
Erect stance, larger brain, smaller size, nocturnality, high growth rate, secondary palate, and interlocking teeth
What are the 3 ossicles?
1 - Stirrup/stapes
2 - Anvil/incus
3 - Hammer/malleus
Where did we get most of our mammal knowledge?
From jaws and teeth
Monotremata includes…
Platypus and echidnas
What is special about monotremes?
They are the only mammals that lay eggs
How are marsupials born?
They crawl from the vagina to the pouch where they continue their development
What type of placenta do placentals have?
A chorioallantoic placenta
