Topic 13 and 19 - Introduction to Reptiles

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5 Terms

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What is a Reptile?

Reptiles are not a monophyletic group (unlike amphibians and mammals). They are paraphyletic because the major clade includes birds (and previously dinosaurs). It is very tricky to classify what a reptile is.

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Image of Phylogenetic Tree

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Reptile Orders in Australia

  1. Testudines (turtles and tortoises)

  2. Crocodilia (crocodiles)

  3. Squamata (lizards and snakes)

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Squamata Families

Geckoes:

  • Gekkonidae

  • Diplodactylidae

  • Carphodactylidae

  • Pygopodidae

Skinks:

  • Lerista

  • Ctenotus

  • Carlia

Dragons:

  • Agamidae

Goannas/monitors:

  • Varanidae

Snakes:

  • Elapidae

  • Pythonidae

  • Typhlopidae

  • Coluribade

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Why so many Lizards?

3 hypotheses:

  1. Lizards fill ecological roles filled by other groups elsewhere

  2. Uniquely ideal for reptile habitats

  3. Uniquely high habitat variability