classes of fish

Question 1

chondrichthyes

Answer 1

diverse group of cartilaginous fish, with around 1,000 species

Question 2

chondrichthyes characteristics

Answer 2

• flexible skeleton made of cartilage
• paired fins
• hard scales
• two-chambered heart
• one pair of nostrils

Question 3

agnatha

Answer 3

cartilaginous, jawless fish

Question 4

agnatha characteristics

Answer 4

• don’t have paired fins or a stomach
• adults + larvae have a chord that provides the main support for the body
• skeleton made of cartilage
• jawless fish
• have a light sensitive pineal eye
• external fertilisation

Question 5

osteichthyes

Answer 5

bony fish, largest class of vertebrates

Question 6

osteichthyes characteristics

Answer 6

• skeleton made of bones
• have a swim bladder
• paired pectoral and pelvic fins
• have dorsal and caudal fins
• have operculum (facial support bones)
• have a lateral line
• fusiform body design (rounded bodies and tapered ends)