CLASS CHONDRICHTHYES.

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Class Chondrichthyes Kingdom: Animalia Phylum: Chordata

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Presentation transcript:

CLASS CHONDRICHTHYES

GENERAL CHARACTERISTICS Moveable jaws (usually ventral) & well developed, replaceable teeth in 6-20 rows

Skeleton of a porbeagle shark Cartilage skeleton

Rigid fins Gill slits

Placoid scales – (same composition as teeth) Dermal denticles

No swim bladder

SHARKS 350 sp. Mostly predators Some filter feeders Whale Shark Great White Shark

Well developed caudal (tail) fin; often heterocercal Well developed caudal (tail) fin; often heterocercal (upper lobe larger) Can not force water over gills; constant swimmers Exception: lemon & nurse sharks

Rows of teeth

Ampullae of Lorenzini Electroreception device to sense bioelectrical fields of orgs

Andre Hartman – Crazy Shark Man

No swim bladder – Large oily liver for buoyancy (20% body weight)

Fusiform (torpedo shaped) body = fast swimmer Countershading – dark on top, light on bottom Blue Shark

White Shark

Hammerhead Shark

Separate sexes; internal fertilization Male Female

Live Birth Egg Cases

RAYS & SKATES 450-550 sp. Flattened bodies; most benthic (demersal) exception – manta & eagle rays Broad, wing-like pectoral fins for gliding through water

Ventral gills (5 pairs) & mouth Bluntnose Stingray

Eat fish & invertebrates Southern Stingray

RAYS VS. SKATES Whip-like tail with stinger & poison gland NO whip-like tail & poison gland

Live Birth Egg Case – Mermaid’s Purse

14 foot freshwater ray in Thailand

75 lb 5-6 foot spotted eagle ray kills woman in Florida (2008)

RATFISH 30 sp. Also called chimeras Deep water (up to 3000 ft); feed on mollusks Rabbit-like head; long rat-like tail Large, triangular pectoral fins

THE END