Transcript Herpetology Lab - Mt. SAC Faculty Contact Directory

Herpetology Lab
Study of amphibians and reptiles
Amphibians
• Frogs, toads, newts, salamanders
• Kingdom Animalia, Phylum Chordata, Class Amphibia
• Semi-terrestrial (double life)
aquatic young, terrestrial adult
• Metamorphosis (frog life cyle)
• No amniotic egg
• Young have gills
• Cutaneous respiration
• No scales (skin with mucus)
• 3 chambered heart
• No true nails or claws
• Homodont teeth
• 10 pairs of cranial nerves
• Ectotherms
Reptiles
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Lizards, snakes, turtles, tortoises, crocadiles, alligators
Terrestrial
Amniotic egg
Keratinized scales
Claws and nails
Respiration by lungs
No metamorphosis
3 chambered heart
Hemipenis in snakes and lizards
Some with heterodont and thecodont teeth
12 pairs of cranial nerves
Ectotherms
Alligator vs. Crocadile
Alligator
1. 4th mandibular (lower jaw) tooth inside mouth when closed
(fits into upper jaw)
2. 4th maxillary (upper jaw) is largest tooth and shows
(upper teeth overlap lower)
3. Rounded snout (U shape)
Crocadile
1. When mouth is closed 4th mandibular is visible
2. 5th maxillary is largest tooth
Upper and lower teeth alternate
3. Triangular to pointed snout (V shape)
alligator
caiman
crocadile
http://www.sandiegozoo.org/animalbytes/t-crocodile.html
Alligator and Caiman Range: alligators are found in the southern United States
and eastern China; caimans are found in Central America and South America
Habitat: grassy swamps and slow-moving rivers
Crocodile Range: Mexico, Central and South America, Africa, Southeast Asia,
and Australia
Habitat: grassy swamps and slow-moving rivers
Mammal Lab
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Kingdom Animalia, Phylum Chordata, Class Mammalia
Mammary Glands
Hair or fur (some exceptions)
Muscular diaphragm
Lower jaw (mandible has 2 halves)
Multiple roots on cheek teeth
3 bones in middle ear
One left aortic arch on heart
Red blood cells without nucleus (when mature)
Heterodont, thecodont
Bony palate
4 chambered heart
Live birth- mouse life cycle
Endotherms