genus rivulus

English Thesaurus

1. killifish (noun.animal)

hypernym	:	fish genus,
definition	:	any of various genus of fish (noun.animal)

member holonym	:	rivulus,
definition	:	found in small streams of tropical America; often kept in aquariums; usually hermaphroditic (noun.animal)

member meronym	:	cyprinodontidae, family cyprinodontidae,
definition	:	large family of small soft-finned fishes; killifishes; flagfishes; swordtails; guppies (noun.animal)