- topminnow, poeciliid fish, poeciliid, live-bearer - small usually brightly-colored viviparous surface-feeding fishes of fresh or brackish warm waters; often used in mosquito control
--1 is a kind of cypriniform fish
--1 is a member of Poeciliidae, family Poeciliidae
--1 has particulars:mosquitofish, Gambusia affinis; platy, Platypoecilus maculatus; mollie, molly - swordtail, helleri, topminnow, Xyphophorus helleri - freshwater fish of Central America having a long swordlike tail; popular aquarium fish
--2 is a kind of cyprinodont
--2 is a member of Xyphophorus, genus Xyphophorus