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26 Cards in this Set
- Front
- Back
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no cranium or backbone
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The invertebrate chordates
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cranium, no backbone, cartilaginous skeleton, no paired fins
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Hagfishes
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jawless fishes
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Lampreys
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Jawed fishes
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Cartilaginous, bony
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Most diverse and numerous group of vertebrates. Paired fins
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Jawed fishes
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cartilaginous fishes
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Chondrichthyes
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Bony fishes
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Osteichthyes
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Includes 96 percent of living fish species
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Bony fishes
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Only existing lineage of lobe-finned fishes
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Coelocanths
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All modern species are freshwater, only found in africa, south america and australia, have gills and outpouchings in the gut wall where gases are exchanged, must surface to gulp air, can encase themselves in a slimy covering when streams run dry.
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Lungfishes
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first tetrapods on land. All require water at some point in the life cycle. skin serves as respiratory organ, all have four legs or a four-legged ancestor. lungs are less efficient than those of other vertebrates.
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Amphibians
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living amphibian groups
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frogs and toads
salamanders caecilians |
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Produce eggs with four membranes, support the development of the embryo in a protected environment . Reptiels, birds and mammals
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The amniotes
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forms a fluid-filled sac around the embryo
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Amnion
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stores nutrients
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Yolk sac
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gas exchange and waste storage
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chorion and allantois
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All are cold-blooded, both sexes have a cloaca, female are fertilized internally, eggs are typically laid on land
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reptile characteristics
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largest order, 95 percent of living reptiles
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lizards and snakes
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only two living species, look like lizards, live off coast of new zealand, has their own distinc lineage
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tuataras
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most diverse group of tetrapod vertebrates, can regulate internal body temperature. Feathers, retain scales on legs, have a cloaca
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birds
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Four chambered heart, highly efficient respiratory system, lightweight bones with air spaces, powerful muscles attach to the keel
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adapted for flight
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hair
mammary glands distinctive teeth highly developed brain extended care for the young |
mammals
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egg laying mammals
3 species left |
monotremes
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pouched mammals
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marsupials
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placental mammals
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eutherians
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most diverse mammalian group
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placental mammals
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