Hagfish and lampreys have gills. They are the only living members of a primitive group of fish without jaws. They have round sucker-like mouths.
Hagfish and lampreys.
subterminal
This would seem to describe the hagfish and lampreys. The description fails by saying that they resemble fish. Hagfish and lampreys are classified as jawless fish. They are fish, none-the-less.
Lampreys are jawless fish known for their eel-like appearance and circular mouth filled with sharp teeth. They are sometimes referred to as "eel-like fish" due to their long, slender bodies and lack of jaws.
Fish that do not have fins and scales include lampreys and hagfish.
The earliest vertebrates were probably similar to lampreys or hagfish.
The only extant jawless fish are hagfish and lampreys.
Fish Use Gills Instead of lungs. Gills Help fish to Breath. Fish Use Gills Instead of lungs. Gills Help fish to Breath.
Hagfish and lampreys are apart of Agnatha which means jawless fish. Hagfish are a parasite fish but can be free swimming. Both jawless fish will feed on carcasses on the bottom of the seafloor.
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The lungfish has both gills and lungs.
Goldfish do not have lungs. Sorry but they have gills. =) Goldfishes do not have lungs. They have GILLS.