(5) Fishes2 - Formerly Class Osteichthyes > 25,000 species...

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Formerly Class Osteichthyes Formerly Class Osteichthyes > 25,000 species Operculum over the gills Paired pectoral and pelvic fins supported by bony girdles Specialization of jaws and feeding mechanisms Now: Class Actinopterygii: Ray-finned fishes Teleosts Class Sarcopterygii: fleshy finned fishes - lungfishes - lobe-finned fish
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Cartilagenous vs. Bony fishes Cartilagenous vs. Bony fishes Chondrichthyes Bony Fish Skeleton Cartilage only Cartilage and bones Swimming Forward only Forward and backward Buoyancy Large, oily liver Gas-filled swimbladder Gills Slits but no Covered gill slits gill cover Reproduction Internal fertilization Eggs usually fertilized externally Scales Rough, sand-paper Smooth, overlapping like placoid scales scales
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Class Actinopterygii: Class Actinopterygii: Ray-finned Fishes Ray-finned Fishes
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Fish Tails Fish Tails Larger fish faster swimmer Sickle shape tail faster Swimming is energetically economical
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Fish Scales Fish Scales Primitive Bony
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This note was uploaded on 04/07/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

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(5) Fishes2 - Formerly Class Osteichthyes > 25,000 species...

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