3454lablecture11 - LECTURE 11 PHYLUM CHORDATA SUBPHYLUM...

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LECTURE 11 PHYLUM CHORDATA SUBPHYLUM VERTEBRATA “GROUP” AMNIOTA All with internal fertilization Development of cleidoic egg with four extraembryonic membranes – waterproof covering for embryos is main adaptation for living a completely terrestrial life, even more important than limbs or lungs Waste is in the form of uric acid – water insoluble so eggs don’t get contaminated “CLASS REPTILIA” Epidermal scales – heavily keratinized Ectothermic, strong skeletons for better locomotion Secrete waste as uric acid to conserve water Quadrate-articular jaws (as opposed to dentary-squamosal) SUBCLASS TESTUDINATA ORDER CHELONIA (TURTLES) Shells, no teeth, varied diets Anapsid skulls (secondarily derived) SUBCLASS DIAPSIDA 2 temporal fenestrae for jaw muscle attachment
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INFRACLASS LEPIDOSAUROMORPHA ORDER SPHENODONTA (TUATARA) ORDER SQUAMATA (LIZARDS, SNAKES, ETC.) Lizards – have legs, caudal autotomy, various feeding modes Snakes – legless, no eyelids, movable jaws for eating large prey
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3454lablecture11 - LECTURE 11 PHYLUM CHORDATA SUBPHYLUM...

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