genus rivulus

Noun
  1. Killifish (synset 101450192)
    is a type of: fish genus - any of various genus of fish
    member holonym: rivulus - found in small streams of tropical America; often kept in aquariums; usually hermaphroditic
    belongs to: cyprinodontidae, family cyprinodontidae - large family of small soft-finned fishes; killifishes; flagfishes; swordtails; guppies

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