BIOL 3300 Vertebrate Zoology: Ectotherms - Herpetology

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Presentation transcript:

BIOL 3300 Vertebrate Zoology: Ectotherms - Herpetology http://www.amphibian.com.au/

How do reptiles reproduce? Viviparity

How do reptiles reproduce? Oviparity

How do reptiles reproduce? Virgin Birth?!? Gekkonids, lacertids, teiids (~33%), xantusiids & a typhlopid

How is gender determined? GSD & TSD ♀ ♂ ♂ ♀ ♀ ♂ ♀

How is gender determined? Testosterone in yolk At ♂ temperatures… 5 α-reductase induced Testosterone => Dihydrotestosterone Gonads => testes Testes => testosterone Testosterone in yolk At ♀ temperatures… aromatase induced Testosterone => Estradiol Gonads => ovaries Ovaries => estrogen

How does reproduction cycle?

How does reproduction cycle?

How does “IT” happen?

What are the parts of an amniotic egg?

How does development occur?

How does “IT” happen?

How does “IT” happen? Alligator mississippiensis

How does life history vary?

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