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Unformatted text preview: Amphibia (frogs & toads) yes yes yes (not all) yes yes no absent Reptilia (snakes, lizards) yes yes yes yes yes yes absent Aves (birds) yes yes no yes yes yes absent Mammalia (mammals) yes yes yes yes yes yes present Note: Lamprey show the first signs of a vertebral column. Hagfish do not have a vertebral column, but they do have a cranium (brain case). Make sure you understand the significance of the derived features, as well as the other features we discussed in lecture....
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- Fall '11