Comparative Anatomy of Osteichthyes Quiz

Which class of vertebrates includes the dominant fishes of seas today?

• Class Agnatha

• Class Osteichthyes

• Class Chondrichthyes

• Class Placodermi

What is the general habitat of Chondrichthyes?

• Both marine and fresh water

• Mostly fresh water

• Mostly marine

• Exclusively freshwater

What type of scales cover the body of Chondrichthyes?

• Ganoid scales

• Cycloid scales

• Ctenoid scales

• Placoid scales

What is the shape of the body of Chondrichthyes?

• Usually bilaterally flattened

• Usually spherical

• Usually dorso-ventrally flattened

• Usually cylindrical

Where is the mouth opening located in Osteichthyes?

• Terminal on head

• Ventral on head

• Lateral on head

• Dorsal on head

How many pairs of gills lie in a pouch covered by a bony flap in Osteichthyes?

• Six pairs

• Five pairs

• Four pairs

• Three pairs

What type of fin is usually present in Osteichthyes?

• Homocercal

• Heterocercal

• Diphycercal

• Dorsocaudal

What is the main characteristic of the subclass Actinopterygii?

• Presence of lung-like swim bladder

• Olfactory sacs connected to mouth cavity

• Absence of pelvic fins

• Presence of long dermal rays in fins

Which superorder includes primitive ray-finned fishes with ganoid scales?

• Chondrostei

• Holostei

• Teleostei

• Actinopterygii

What is the special characteristic of the order Polypteriformes?

• Lobed pectoral fins

• Long rostrum

• Ossified skeleton

• Fusiform body