Sea lampreys are jawless fish and, like all fish, they are vertebrates because they have a spine and spinal cord, and an internal skeleton. They belong to the Phylum Chordata.
Mammals, birds, fish, reptiles and amphibians are all vertebrates.
Hagfish are cartilaginous, meaning their skeletons are made from cartilage. FALSE what the person just wrote is wrong. Hagfish are neither cartilaginous or bony fish. Although they have cartilage in their bodies, they belong to a third category called Jawless fish. Jawless, cartilaginous, and bony are the 3 types of fish.
Lizards are not bony or cartilaginous fish, they are reptiles.
bony
There are bony fishes and cartilaginous fishes.
No. Hagfish are cold-blooded, as are all similar eels. The hagfish is unique in that it has no vertebrae (spinal column) but does have a bony skull.
it is the cartilaginous fish.s
Similar to Stingrays, skates are cartilaginous.
bony jaws
Fish are general classified into one phylum which is known as chordata. There some fish like the hagfish that are not able to fit into this phyla properly.
A bony skeleton. Snappers are a member of the taxonomic group Osteichthyes (bony fish), as opposed to cartilaginous fishes (like sharks) or boneless fishes (like hagfish).
Sharks are not bony fish. They are cartilaginous fish.
Technically, all fish that are not cartilaginous (sharks and rays) or jawless (lampreys, hagfish, etc) are considered bony fish. Thus, all of the fish that penguins eat are considered bony fish.