VertebratesPhylum Chordata Fish (3 classes) Ichthyology- study of fish
Class Agnatha • - jawless fish • hagfish and lampreys • - they suck blood or bore into their bodies and eat them from the inside out.
2.Class Chondrichthyes • - cartilaginous fish • - sharks, rays and skates • - skeleton made of cartilage • - rough sand papery skin
SHARKS • 250 species • - found throughout oceans at all depths, but mostly in tropical coastal waters;a few found in freshwater (bullshark) • - all sizes from 10 in.(spiny pygmy shark) to 60 ft.(whale shark) • - most carnivorous predators, some peaceful plankton feeders.
Stingrays and Skates • have flat bodies and mostly live on the bottom • - gill slits are on the underside • - pectoral fins are flat and expanded,look like wings • - eyes on top of the head • - stingrays have a whip like tail with a stinging spine • - skates do not have a whip like tail with spines