Anatomy and Synapomorphies Flashcards
Choanae
Brings air through throat
Bones are made of
Protein and mineral
Orbit
Part of skull contains the eye
Why did synapsids develop infratemporal fenestra?
Allowed more room for larger jaw closing muscles
More powerful bite
Why did reptilia develop…
post temporal fenestra
color vision
Why did Sauria develop…
Infratemporal fenestra
Supratemporal fenestra
Back or skull concave eardrum
Why did amniotias develop amniotic eggs?
lay on dry land
complete colonization or land
Why did lepidsauria…
Overlapping scales
Why did Squamala develop cranial kinesis and Moveable joint between quadrate?
(bone connects with lower jaw)
ability to move one part of skull relation to another
Why did archosauriforms develop…
Antorbital fenestra
Mandibular fenestra
Antorbital fenestra
Symetrical foot: upright posture
Serrated teeth
Socketed teeth
Why did Archosauria develop…
Four chambered heart
Acetabular crest (brace femur upright)
Complex nest
Why did Dinosaurimorpha develop…
First three fingers in band are longest
S-shaped neck
Why did Dinosauria develop…
Opposable thumb
Perforate acetabulum
Sharply unturned femoral head
Why did Ornithisauria develop:
Predentary teeth
Blunt teeth
Inset jaw margin
Backturned pubis
(beak)
(physical break down of food)
(muscular cheeks)
(larger gut tract)
Obossified tendends in vertebral column (stable vertebral column)
Why did Hetereodontosauridal develop tusks?
Probably display
