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Class Reptilia

Class Reptilia. Traditional Taxonomy. Class Reptilia Order Testudines – turtles, terrapins, tortoises Order Crocodilia – crocs & gators Order Squamata – snakes & lizards Order Sphenodonta – tuatara. Fig. 26.1. Some Early Reptilians. General Reptile Traits. Reproduction

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Class Reptilia

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  1. Class Reptilia

  2. Traditional Taxonomy • Class Reptilia • Order Testudines – turtles, terrapins, tortoises • Order Crocodilia – crocs & gators • Order Squamata – snakes & lizards • Order Sphenodonta – tuatara

  3. Fig. 26.1

  4. Some Early Reptilians

  5. General Reptile Traits • Reproduction • Amniotic eggs with shell • Internal fertilization • Oviparous, ovoviviparous, viviparous (few) • Direct development • Epidermal scales & claws • 5 digits on each limb • Thoracic ribs (except turtles)

  6. Shelled Egg

  7. Epidermal Scales

  8. Order Testudines

  9. Sex Determination in Turtles & Crocodilians • Turtles • Males develop at low temps • Females develop at higher temps • Crocodilians • Males develop at higher temps • Females develop at lower temps

  10. Order Crocodilia

  11. Crocodilians

  12. Order Squamata • Shed their epidermal scales with growth

  13. Gekkos

  14. Chameleons

  15. Iguanas

  16. Snake Families • Viperidae • Vipers • Sheathed fangs at front of mouth • Elapidae • Short, immovable fangs at front of mouth • Colubridae • Rear fanged (or no fangs) • Mostly non-poisonous • Hydrophiidae • Sea snakes • Extremely poisonous • Boidae • Constrictors • Many retain vestigial pelvic structures

  17. Order Squamata, Suborder Serpentes Cotton mouthor water moccasin Copper head Rattlesnake Viperidae

  18. Snake Venoms • Neurotoxins • Paralysis • Blindness • Hemorrhagins • Digest tissues • Prevent clotting Fasciotomy

  19. Viperidae

  20. Pit Organs of Pit Vipers Family Viperidae Subfamily Crotalidae

  21. Red on yellow, kill a fellow Red on black, friend to jack Coral snake or King snake

  22. Elapids

  23. Temperature Regulation • Cold-blooded vs warm-blooded • Poikilothermy vs homeothermy • Ectothermy vs Endothermy

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