Chapter 24 Flashcards
(20 cards)
Nerve Cord
Cord of nerve tissue that runs along back, hollow, filled with fluid
Notocord
Cord between nerve cord and digestive tract; stiff, flexible, can be replaced by skeleton in developing embryo
Pharyngeal Gill slits
Grooves in pharynx of developing embryo; may become gills
Post anal tail
Muscle; nerve cord that extend past anus of developing embryo
Tunicates
No skull No backbone Simple heart Gill slits Ectothermic External fertilization
Lancelets
No skull No backbone Simple heart Gill slits Ectothermic External fertilization
Endothermic
Heat needed to maintain temperature comes from environment; cold blooded
Endothermic
Heat needed to maintain temperature comes from organism; warm blooded
Hagfishes
Skull No backbone gills 2-chamber heart Ectothermic External fertilization
Lampreys
Skull Backbone Gills 2-chamber heart Cartilage skeleton Ectothermic External fertilization
Cartilaginous Fishes
Skull Backbone Gills 2-chamber heart Cartilage skeleton Ectothermic Internal fertilization
Ray-finned fishes
Skull Backbone Gills 2-chamber heart Bone skeleton Ectothermic External fertilization
Lungfishes
Skull Backbone Gills and lungs 2-chamber heart Bone skeleton Ectothermic External fertilization
Amphibians
Skull Backbone Skin, gills or lungs 3-chamber heart Bone skeleton Limbs Ectothermic External or internal fertilization
Reptiles
Skull Backbone Lungs 3-chamber heart Bone skeleton Ectothermic Limbs Internal fertilization shelled egg in embryo development
Mammals
Skull Backbone Lungs 4-chamber heart Bone skeleton Limbs Endothermic Internal fertilization, mammary glands for young
Monotreme eggs
Leathery eggs
Marsupials
Embryo partially develops in uterus (simple placenta)
Development finishes in pouch
Placental Mammals
Embryo fully develops in uterus (complex placenta)
Characteristics of chordates
Bilateral symmetry 3 germ layers, a defined head Organs and organ systems Coelom Dorsal nerve cord Notocord Pharyngeal gill slits Post-anal tail
