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17 Cards in this Set
- Front
- Back
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what are the key traits of chordata
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deuterostomes with notochord, joined appendages, & segmentation
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what are the 4 key features present at some point in life cycle of all chordates
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dorsal, hollow nerve cord. pharyngeal gill slits. notochord. postanal tail.
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what are the subphyla of chordata
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cephalochordata, urochordata, craniata
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what is cephalochordata
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lancelets. fishlike creatures that bury themselves in mud. muscles broken up into bands called myomeres. no brain in adults.
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what is urochordata
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sea squirts & tunicates. barrel shaped, sessile, filter feeders. many secrete & live in tough cellulose sac (tunic). no brain in adults
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what are the characteristics of craniata
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head with brain & skull. vertebral column. neural crest. internal organs. endoskeleton made of cartilage/bone.
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what are the fishes classified under craniata
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myxini, cephalaspidomorphi, chondrichthyes, osteichthyes
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what are the tetrapods considered craniata
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amphibia, reptilia, aves, mammalia
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what type of assemblage are fishes
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paraphyletic (grade)
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describe the single loop blood circulation found in fish
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heart-->gills-->rest of body-->heart
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what is the name of the first fishes
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ostracoderms. abundant in ordovician & silurian periods
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what are gnathostomes
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jawed veterbrates.
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what is acanthodii
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first successful group of jawed fish. common in denovian period.
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what is class placodermi
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placoderms. extinct. armored fish. common during late denovian.
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what is superclass agnatha
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jawless fish. (grade)
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what is class myxini
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hagfishes. (clade) can't regulate body salts.
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what is cephalospidomorphi
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lampreys (clade) vertebrae only shards of cartilage in tail. larva called ammocoete.
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