Science quiz 24

For science :D

Two classes of cartilaginous fish

chrodrichthytes and cyclomata

Denticles

Sharks tooth like placoid scales that make them feel like sandpaper.

Spiracles

nostrils behind the eyes of both sharks and skates.

Mermaids purse

A protective case for some sharks and skates embryos, shaped like a small pouch.

Whale shark

the largest known fish

Great white shark

largest carnivorous fish

Hammerhead shark

unusual head anatomy

Sand tiger shark

only known shark that comes to the surface to gulp air using its stomach as a swim bladder

Sawfish

has an unusual nose called a rostrum

Chimaeras

Have gills covered by operculum and have only one gill opening.

Hagfish

has 70-200 pores that run along its body that excrete proteins that when mixed with seawater produce slime

Rays and batoids

are cartilaginous fish with flattened bodies

Skates

are non venomous rays with long noses and have dorsal fins near the tip of the tail and lay eggs

Electric rays

electric rays stun or kill their prey with an electric charge generated by special organs located behind each eye