Agnatha/Chondrichthyes/Osteichthyes
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28 terms
Terms | Definitions |
|---|---|
 agnatha | examples: lamprey, hagfish |
| agnatha | jawless fish (don't need jaws cuz they're parasites) |
| agnatha | cartilage skeleton, notochord for backbone |
| agnatha | no scales, slimy skin (secretes mucus, which defends and protects) |
| agnatha | 7 gill openings w/ no covering (not great, easily damaged) |
| agnatha | live in lakes, return to streams to lay eggs |
| agnatha | feed on bony fish: grind off scales w/ radula, feed on body fluids |
| chondrichthyes | example: sharks, skates, rays |
| chondrichthyes | cartilage body skeleton (good b/c it's a shock absorber, flexible, light) |
| placoid scales | sharp scales that cover chondrichthye bodies |
| chondrichthyes | 5 gill openings (no covering) |
| chondrichthyes | float b/c of fats & oils in its tissues |
| chondrichthyes | have mouth on ventral side (good: more protected. bad: must lift head back to eat, can't see what they're doing for a moment) |
| electromagnetism | method used by chondrichthyes to smell & "See" |
| chondrichthyes | normally eat crustaceans, mollusks, fish |
| oviparous | skates & rays lay eggs in pouch that hatch outside their bodies, so they are ________________ |
| ovoviviparous | sharks retain their eggs, which nourish young inside body. they are ____________ |
| ovaduct | path that developing embryos follow in a shark body from the uterus to full development |
| skate | these chondrichthyes move by undulating their edge in ripples |
| ray | these chondrichthyes move by moving pectoral fins up and down like wings |
| osteichthyes | examples: perch, eels, salmon, blue gill, sturgeon. (most numerous of all vertebrates) |
| osteichthyes | have bony skeleton (more rigid, stronger, but they can break) |
| osteichthyes | have flat, continuously growing scales. |
| rays | osteichthyes have cartilage bones that support their fins called ______________ (precursors to limbs) |
| operculum | osteichthyes have gills covered w/ ____________ |
| swim bladder | gas filled balloon in osteichthye fish for buoyancy (gasses come from blood) |
| concentrate, dilute | marine fish _________ their urine, freshwater fish ______________ their urine |
| spawning | oviparous fish lay their eggs in water, called _____________ |
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