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26 Cards in this Set

  • Front
  • Back
no cranium or backbone
The invertebrate chordates
cranium, no backbone, cartilaginous skeleton, no paired fins
Hagfishes
jawless fishes
Lampreys
Jawed fishes
Cartilaginous, bony
Most diverse and numerous group of vertebrates. Paired fins
Jawed fishes
cartilaginous fishes
Chondrichthyes
Bony fishes
Osteichthyes
Includes 96 percent of living fish species
Bony fishes
Only existing lineage of lobe-finned fishes
Coelocanths
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.
Lungfishes
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.
Amphibians
living amphibian groups
frogs and toads
salamanders
caecilians
Produce eggs with four membranes, support the development of the embryo in a protected environment . Reptiels, birds and mammals
The amniotes
forms a fluid-filled sac around the embryo
Amnion
stores nutrients
Yolk sac
gas exchange and waste storage
chorion and allantois
All are cold-blooded, both sexes have a cloaca, female are fertilized internally, eggs are typically laid on land
reptile characteristics
largest order, 95 percent of living reptiles
lizards and snakes
only two living species, look like lizards, live off coast of new zealand, has their own distinc lineage
tuataras
most diverse group of tetrapod vertebrates, can regulate internal body temperature. Feathers, retain scales on legs, have a cloaca
birds
Four chambered heart, highly efficient respiratory system, lightweight bones with air spaces, powerful muscles attach to the keel
adapted for flight
hair
mammary glands
distinctive teeth
highly developed brain
extended care for the young
mammals
egg laying mammals
3 species left
monotremes
pouched mammals
marsupials
placental mammals
eutherians
most diverse mammalian group
placental mammals