The difference between Cyclostome and Hagfish
When used as nouns, cyclostome means any of various primitive jawless fish of the class cyclostomata, such as the lamprey or hagfish, whereas hagfish means any of several primitive eellike fish, of the family myxinidae, having a sucking mouth with rasping teeth, and sometimes used as food or for eelskin leather.
check bellow for the other definitions of Cyclostome and Hagfish
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Cyclostome as a noun:
Any of various primitive jawless fish of the class Cyclostomata, such as the lamprey or hagfish.
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Hagfish as a noun:
Any of several primitive eellike fish, of the family Myxinidae, having a sucking mouth with rasping teeth, and sometimes used as food or for eelskin leather.