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|Noun||1.||Cyprinodontidae - large family of small soft-finned fishes; killifishes; flagfishes; swordtails; guppies|
fish family - any of various families of fish
Cypriniformes, order Cypriniformes - an order of animals including almost entirely freshwater fishes: characins; loaches; carp; suckers; sometimes classified as a suborder of Ostariophysi
cyprinodont - any member of the family Cyprinodontidae
genus Rivulus - killifish