Fish.

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Agnatha Chondrichthyes Osteichthyes

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Presentation transcript:

Fish

Fish I. Fish A. 540 MYA appear in the oceans. B. Water dwelling vertebrates 1. Scales: (There are 4 types) 2.Fins (vary: caudal, anal, pectoral…) 3. Throat with gill slits

Fish C. Types 1. Jawless a. most primative 1. Lack jaw 2. Lack scales 3. Lack paired fins

Fish b. No bones c. Examples 1. Hagfish 2. Lamprey

Fish 2. Cartilaginous a. Skeleton made out of cartilage. b. Most have tooth-like scales. c. NO swim bladder d. Examples 1. Sharks 2. Skates :Egg laying, prominent dorsal fin 3. Rays : Bear live young

Fish 3. Bony a. Have a swim bladder; gives buoyancy b. Color vision c. Distant touch; lateral line that senses movement.