class chondrichthyes cartilaginous fishes -...
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Class Chondrichthyes
Cartilaginous fishesMarine Fishes
Class Chondrichthyes
Phylum Chordata
Subphylum Vertebrata
Cartilaginous fishes
Sharks, skates, rays, ratfishes
Class Chondrichthyes
Endoskeleton of cartilage
Ventral mouth w/ movable jaws
Well developed teeth
Class Chondrichthyes
Paired lateral (pectoral fins)
Placoid scales (pointed backward tip)
Claspers (males)
Sharks
Class Chondrichthyes
gill slits instead of operculum
Rows of teeth in constant motion
Huge size variation
Size decrease due to overhunting
All regions/all depths
Some may even be freshwater/brackish
Slow growth
Slow reproductive cycle
Rays and Skates
Class Chondrichthyes
Mostly benthic
Dorsoventrally flattened bodies
Gills slits underside of body
Pectoral fins expanded
Venom stinger at base of tail (rays)
Some electric
Ray and Skate Species
Rays and Skates
Class Chondrichthyes
Skates oviparous
Rays ovoviviparous
Skates more rounded
Do not have whiplike tail/venom
Ratfishes
Class Chondrichthyes
One pair gill slits covered by skin
Mostly deepwater
Feed on mollusks/crustaceans