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20 Cards in this Set
- Front
- Back
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chordate characteristics
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- notochord
- dorsal hollow nerve chord - muscular post anal tail - pharyngeal slits |
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urochordata
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- eumetazoa -> triploblastic -> deuterostome -> urochordata
- simple chordate |
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craniates
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> craniates
- have a head region - two clusters of Hox genes - neural crest during development |
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hagfish
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> hagfish
- skull made of cartilage. - no jaws or vertebrae |
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vertebrates
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate
- craniates with a backbone |
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lampreys
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> lamprey
- no jaw - oldest living lineage of vertebrates |
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gnathosomes
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes
- have jaws! |
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chondrichthyes
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> chondrichthyes
- sharks, snakes, rays - CARTILAGE skeleton |
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osteichthyans
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> osteichthyans
- mineralized skeleton |
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fish
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> osteichthyans -> fish
- gills. - swim bladder - some have lungs |
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tetrapods
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> oteichthyans -> tetrapods
- have limbs |
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amphibians
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> oteichthyans -> tetrapods -> amphibians
- gas exchange over skin - eggs need to be kept moist |
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amniotes
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> oteichthyans -> tetrapods -> amniotes
- have amniotic eggs - reptiles/ birds and mammals |
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amniote adaptations for land
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- amniotic eggs
- breathing aided by rib cage muscles |
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reptiles and birds
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> oteichthyans -> tetrapods -> amniotes -> reptiles and birds
- reptiles are ectothermic - rely on their environment to regulate body tempterature - birds are endothermic - constant body temperature. |
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mammals
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- eumetazoa -> triploblastic -> deuterostome -> chordate -> vertebrate -> gnathosomes -> oteichthyans -> tetrapods -> amniotes -> mammals
- characteristics: milk, hair, differentiated teeth, endothermic |
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mammal classification
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- monotremes
- marsupials - eutherians |
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monotremes
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- only in australia and new guinea
- lay eggs - platypus and echidnas |
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marsupials
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- placenta nourish the young
- give birth to live young early in development - opossum, tasmanian devil, kangaroo |
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eutherians
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- more complex placenta than marsupials
- placental mammals - longer pregnancy - complete embryonic development within the uterus |
