Coelomates.
No. they are coelomic
Hydras are acoelomates.
The common name of Osteichthyes is bony fish.
its a osteichthyes or other meaning of osteichthyes is bony fish
Acoelomates are animals that do not have a body cavity filled with fluid between the digestive tract and the body wall. Creatures like jellyfish (cnidarians) and flatworms (Platyhelminthes) are all acoelomates
Osteichthyes is a biological class that includes bony fish. Osteichthyes have skeletons primarily composed of bone tissue. These fish are characterized by their bony skeleton and swim bladder.
The reproduction among organisms in Osteichthyes varies greatly, but is all sexual reproduction with separate sexes.
Other fish.
scales
coelomates
cold blooded