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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.
Hagfish and lampreys.
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.
Lampreys and hagfishes are the only jawless vertebrates to survive today. They both have a round mouth and for this reason are often referred to as cyclostomes.
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.
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.
n. 1. a class of eel-shaped chordates with a cartilaginous skeleton lacking jaws, scales, and pelvic fins. Among these are the lampreys and hagfishes. There are some extinct forms.
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 hagfish and the lamprey belong to the superclass Agnatha. This group is characterized by jawless fish and is considered one of the most primitive lineages of vertebrates. Agnatha includes both extant species like hagfish and lampreys, as well as extinct forms.