Crocodilians

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1
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What are general morphological characteristics of crocodilians?
-Elongated body w/powerful tails & limbs
-Long snouts
-Armored body
-Teeth sit in sockets
-4 chambered heart
-Pulmonary and systemic circulation
2
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Bony plates called ___ located underneath the _____ scales
-Osetoderms

-Epidermal
3
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______ separates the respiratory and buccal passageways
Secondary palate
4
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What are behavioral characteristics of crocodilians?
-Nocturnal hunting strategy
-Oviparous-nest builders
-Unique dismemberment strategies
-Vocalization & visuals
5
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Vocalization includes:
-Roars
-Grunts
-Cough
-Purrs from vocal cords
6
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Low frequency sounds are made from:
Contractions of abdominal muscles
7
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Crocodilians sensory system
-Enlarged olfactory processing region of brain
-Nictitating membrane
-Vertical pupils
-Tapetum lucidum
-Rods & Cones
8
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Crocodilians locomotion:
-High walk
-Belly crawl
-Gallop
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Crocodilian thermoregulation:
-Denning
-Ice response
-Basking
10
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What are the 4 major morphological differences between Alligators & Crocodiles
1. Jaw shape
2. Teeth orientation w/closed mouth
3. Lingual salt glan
4. Dermal pressure receptors
11
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Crocodylidae (14)
EX: Nile Crocodile
-Long snouth "V" or "A" shaped
-4th tooth exposed w/closed mouth
-Rest of teeth in pits w/closed mouth
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Alligatoridae (8)
EX: American Alligator
-Snouth broad "U" or "C" shaped
-Opportunistic feeder
-"El Lagarto = Lizard
-4th tooth on bottom & pit in upper jaw
13
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Gavialidae (1)
EX: Common Gharrial
-Long slender snout
-Piscivore
-Swallows fish head first
-Interlocking teeth