JAWLESS FISH=>JAWLESS FISH=>•Subphylum: Vertebrata, Class: Agnatha

•lampreys and hagfishes•scaleless, cylindrical body•no vertebral column (a notochord)•poor swimmers

•Subphylum: Vertebrata, Class: Agnatha

•lampreys and hagfishes•scaleless, cylindrical body•no vertebral column (a notochord)•poor swimmers

JAWLESS FISH=>JAWLESS FISH=>•LAMPREYS are usually parasites with a larval stage which filter-feeds

•HAGFISHES have no larval stage and live at the bottom of cold seas acting as scavengers.

•LAMPREYS are usually parasites with a larval stage which filter-feeds

•HAGFISHES have no larval stage and live at the bottom of cold seas acting as scavengers.

buccal funnel or “mouth”buccal funnel or “mouth”

lampreys on lake troutlampreys on lake trout

sea lampreysea lamprey

atlantic hagfishatlantic hagfish

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CARTILAGINOUS FISH=>CARTILAGINOUS FISH=>• Subphylum: Vertebrata, Class:

Chondrichthyes• sharks, rays and skates• skeleton of cartilage• hinged jaws, paired fins• ventral mouth

• Subphylum: Vertebrata, Class: Chondrichthyes

• sharks, rays and skates• skeleton of cartilage• hinged jaws, paired fins• ventral mouth

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heterocercal tail

heterocercal tail

homocercal tail

homocercal tail

TAILS:

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CARTILAGINOUS FISH=>CARTILAGINOUS FISH=>•have large, oily liver for buoyancy (to 20% wt.)–still heavier than water

•have large, oily liver for buoyancy (to 20% wt.)–still heavier than water

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CARTILAGINOUS FISH=>CARTILAGINOUS FISH=>•tough skin, placoid scales•ventral mouth w/ 6 to 20 rows of sharp teeth

•tough skin, placoid scales•ventral mouth w/ 6 to 20 rows of sharp teeth

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shark jawboneshark jawbone

CARTILAGINOUS FISH=>CARTILAGINOUS FISH=>•5-7 pairs of gills(many must swim constantly)

•5-7 pairs of gills(many must swim constantly)

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Silky SharkSilky Shark

CARTILAGINOUS FISH=>CARTILAGINOUS FISH=>•complex digestive system with “spiral valve intestine”

•complex digestive system with “spiral valve intestine”

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CARTILAGINOUS FISH=>CARTILAGINOUS FISH=>•have a “lateral line” system•fertilization is internal and are usually born live

•have a “lateral line” system•fertilization is internal and are usually born live

Ampullae of Lorenzini

“Techno Shark”“Techno Shark”

Gray Reef SharkGray Reef Shark

Blacktip Reef SharkBlacktip Reef Shark

Great White SharkGreat White Shark

Hammerhead SharkHammerhead Shark

Silky SharkSilky Shark

Whitetip Reef Sharks need love too...Whitetip Reef Sharks need love too...

Whale SharkWhale Shark

Whale SharkWhale Shark

Whale SharkWhale Shark

Southern StingraySouthern Stingray

Dasyatis americanaDasyatis americana

Southern StingraySouthern Stingray

Manta RayManta Ray

Manta RayManta Ray