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rcornelio
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What are the five orders of reptiles around the world
- Crocodila: crocodiles and alligators
- Chenolia : turtles and tortises
- Squamata :snakes and lizards
- Rhynocophelia : NZ only
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Why are reptiles so successful?
- they have scales that prevent water loss
- they have an amniotic sac fluid filled to protect their young
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How many families in the different orders of reptiles?
- Crocodiles: 1 family
- Turtles: 4 families
- Lizards: 5 families
- Snakes: 7 families
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Are reptiles monophyletic?
No, reptiles are not monophyletic in fact they all had different ancestors
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Crocodiles : give a a brief summary
- widespread
- have heavily armored bodies
- advanced maternal care - fathers carry babies in mouth
- all lay eggs
- 20 mya
- tropical distribtuin
- Two types : Fresh water and Salt Water
- Fresh water : endemic and restricted( long slender not dangerous
- Salt water : PNG and Auz( dangerous eat big animals)
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Give a brief description of turtles and tortoises
- Chelonia are based on the way the head retrats
- Cryptoria : 3 families
- Pleurodira: 1 family
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Give a brief description of Australian Lizards
- 5 families ( some with legs others without)
- Agamidae : dragons , have strong fast moving legs, all oviparous and eggs in burrows (have head bobbing and other visual displays as courtship)
- Geckonidae: geckos, nocturnal, oviparous,some parthenogenesis have tail autonomy
- Pygopodidae: legless lizards , endemic to aus, tail autonomy,no fore limbs but hind limbs reduced to flops , have a fleshy tongue and ear holes
- Scincidae: skinks, both oviparous and viviparious , high diversity
- varanidae: monitors and dragons , closest relative to snakes, oviparous , fast , predators and scavengers
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Give a brief description of Australian snakes
- legless and 7 families
- Tuphilopidae : (blind snakes) , light sensitive eye spots ,insectivourous , and oviparous
- Phythonidae: (pythons) large muscular snakes, mostly nocturnal,oviparous kill prey by afixiation
- arrochordidae: file snake aquatic, viviparous, tropical lagoons of NT
- Coluridae: tree snake , in east coast, arboreal both oviparious and viviparious
- elapidae : venemous land snakes , front fanged , oviparious and viviparious
- Laticaudidae : sea snake oviparous come to shore to lay eggs
- Hydrophiida : sea snake wholly acquatic viviparious
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Oviparous vs viviparous
- Oviparous : ancestral condition
- most eggs laid in burrows
- some incubate their eggs
- Viviparous: birth , colder eggs dominant
- Suggests evolution due to thermalconstraints on embryogenesis
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How does sex determination differ in crocodiles and turtles
fresh water crocodiles and marine turtles : • <30oC all males• 30-32oC mixed males & females• >32oC all females(above is for some Australian turtles
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