synapsids and diapsids Flashcards
what are amniotes?
defined by 3 membranes around the embryo
when had amniotes evolved by?
amniotes evolved by late carboniferous
how is the lineage defined?
defined by temporal fenestration - holes in the top of the head
synapsid = 1 hole
diapsids = 2 holes
anapsid = no holes
what are the most abundant permian land vertebrates?
synapsids
whats the purpose of temporal fenstration?
allowed jaw to close as adductor muscle could bulge
whats the different with synapsids and sauropsid?
morphological differences in synapsids and sauropsid brains
what are cynodonts?
where mammalian jaw, posture and diaphragm originated
what was a dinosaurs (sauropsids) posture
bipedal postue
what are the differences between synapsid and sauropsid?
lungs
jaws
circulation
kidneys
brains
parental care