Vert Evo & Eco- Exam 3

ZOO 4301- Vert Evo & Eco

What are the 3 archosaur synapomorphies?

• antorbital fenestra

• mandibular fenestra

• femur w/ 4th trochanter

Where are gharials native to?

India & Nepal

How to tell apart false from true gharials?

false has a broader snout

How can Crocodilia teeth be described?

thecodont, polyphodont, homodont

What are acrodont + pleurodont teeth?

acrodont- sits on top

pleurodont- sits on shelf

What kind of bone are osteoderms made of?

dermal bone

Do snakes have osteoderms?

no

What is the function of osteoderms in Crocodilians?

thermoregulation; well vascularized & used in heat exchange

What is gastralia?

provide support for abdomen and attachment sites for abdominal muscles

Describe crocodilian circulation (write it down)

What is foramen of panizza?

channel connecting left and right aorta

What happens in circulation when crocodiles dive?

closes of blood from going to lungs

What reproduction do crocodiles have?

ALL oviparous (lay eggs)

How do most crocs lay eggs?

mound nesters

Do crocodilians have parental care?

yes

How do crocs communicate?

vocal with bellows, squeaks, exhalations

What are the functions of croc communication?

dominance, aggression, territoriality

Is infrasound in crocs made by both M and F?

no, just males