3454lablecture10 - LECTURE 10 PHYLUM CHORDATA SUBPHYLUM...

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LECTURE 10 PHYLUM CHORDATA SUBPHYLUM VERTEBRATA SUPERCLASS AGNATHA Retain notochord as adults with jointed cartilaginous vertebrae 2 chambered heart, no jaws, 1 st and 2 nd gill bars can manipulate food, will eventually become lower jaws in descendants CLASS MYXINI - HAGFISH Scavengers, slimy with mucus for defense and feeding CLASS PETROMYZONTES – LAMPREYS Scavengers and parasites, migrate from fresh to saltwater for breeding CLASS CHONDRICHTHYES (CARTILAGINOUS FISH) Jaws, placoid scales, internal fertilization, males with claspers No swim bladder, live-bearing or egg-laying SUBCLASS ELASMOBRANCHII – SHARKS, SKATES, AND RAYS Separate gill slits, 1 st gill slit is a spiracle, heterocercal tail SUBCLASS HOLOCEPHALI – RATFISH Upper jaw fused to chondrocranium, gills covered by operculum CLASS OSTEICHTHYES (NOT A TRUE GROUP) Bony fish with external fertilization, operculum over gills Lungs evolved into swim bladder (some retain lungs for air breathing) SUBCLASS ACTINOPTERYGII – RAY-FINNED FISHES Ganoid scales (gar and sturgeon)
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This note was uploaded on 11/29/2009 for the course BIOLOGY 3454 taught by Professor Nelson during the Spring '09 term at UT Arlington.

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3454lablecture10 - LECTURE 10 PHYLUM CHORDATA SUBPHYLUM...

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