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Definition
| suphylum of Chordata which includes tunicates (sea squirts) characterized by the leathery "tunic" which covers their sponge-like body, they're motile as larva & sessile as adults (save with salps who remain motile), filter-feeders, can be colonial or solitary |
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Definition
| subphylum of Chordata which includes lancelets, characterized by their fish-like body (without jaws or vertebrae), they use gill slits for filter feeding and live on soft sandy bottoms/muddy shores |
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Term
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Definition
| subphylum of Chordata characterized by spine/vertebral column, a dorsal row of hollow skeletal elements which protect the nerve cord |
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Definition
| stiff cartilaginous rod which supports length of body |
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Definition
| openings behind the jaw commonly used for filter feeding |
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Term
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Definition
| class of Vertebrata which includes bagfishes and slime eels characterized by 10-14 gill sets, no eyes or jaws, but a rasp-like structure which comes out of mouth to break apart food, an ability to absorb nutrients through skin, tendency to scavenge & eat prey from inside |
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Term
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Definition
| class of Vertebrata which includes lampreys and stone suckers characterized by long eel-shaped bodies with seven gill sets, eyes, instead of jaws they have a disc-shaped sucker-type mouth that is used to attach to prey and suck blood |
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Term
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Definition
class of Vertebrata which includes subclasses Elasmobranchii and Holocephali, characterized by fish with cartilaginous bones, placoid scales (at least at one stage), five to seven gill sets, internal fertilization, strong hearing, smell, ability to sense movement, heartbeats and position relative to Earth's poles, stiff dorsal, pectoral, pelvic and caudal fins, with claspers in males |
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Term
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Definition
| subclass of Chondrichthyes which contains sharks, rays and skates, characterized by (mostly) five exposed gill sets, well-developed jaws with rows of teeth, denticles/placoid scales, ventral mouth, claspers |
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Definition
| subclass of Chondrichthyes which includes ratfish characterized by the upper jaw being fused with the cranium and a single gill set |
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Term
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Definition
| class of subphylum Vertebrata including all ray-finned fishes, characterized by the swim bladder, the spinous and soft-rayed portions of the dorsal fin, terminal mouths, round scales, equally lobed caudal fins, gill coverings |
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