killifish

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Related to killifishes: Cyprinodontidae, Killies

killifish,

any of more than a thousand species of small fish of the several families of the order Cyprinodontiformes (toothed minnows or toothed carps), a group that includes also the topminnows and many popular aquarium fishes (e.g., the guppy or rainbow fish, Poecilia reticulata) among its brightly colored tropical species. Most North American toothed minnows are oviparous, i.e., bearing young hatched from eggs, and some are quite colorful; however, the tropical viviparous species (i.e., bearing live young) are preferred for aquariums, since they are easier to raise. Killifishes average from 2 to 4 in. (5–10 cm) in length and have compressed bodies, small mouths with projecting lower jaws, unforked tails, and large scales. They live in ponds, streams, ditches, and salt marshes throughout the United States and feed on insect larvae, crustaceans, and small water plants. The banded killifish is found in the Mississippi basin; the common killifish (5 in./12.5 cm) is an eastern species. Guppies can survive temperatures of up to 100°F; (38°C;) as can certain topminnows of the W United States. The greenish-gray female guppy (1 1-2 in./3.75 cm) produces from 12 to 25 live offspring every few weeks; in captivity they must be separated from the cannibalistic adults. The rainbow colors of the male guppy (1 in./2.5 cm) are marked with black spots and bars. Like the guppy, the 2-in. (5-cm) Gambusia, a topminnow of the S Atlantic and the Gulf, bears live young and is important in controlling mosquitoes, on whose larvae both the guppy and the minnow feed. Killifishes are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Actinopterygii, order Cyprinodontiformes.
References in periodicals archive ?
Historical biogeography of Cynolebiasine annual killifishes inferred from dispersal-vicariance analisys.
Although the present study did not investigate the reproductive tactics in relation to size and ontogeny, the ethogram and the qualitative analysis of videotapes suggest that, depending upon social and environmental factors, males may adopt different behaviors that employ different tactics, as has been suggested for other killifishes.
lima contrasts with that reported for other species of killifishes in the Atlantic drainage such as F.
Comparative morphology, phylogenetic relationships, and historical biogeography of plesi-olebiasine seasonal killifishes (Teleostei: Cyprinodontif-ormes: Rivulidae).
Comparative studies on the biology of killifishes (Pisces, Cyprinodontidae).
If the presence of UV cones in the Atlantic silverside were confirmed, the visual pigment complement of this fish would then be similar to those of the killifishes, with [[Lambda].
This genus is a speciose clade of West African killifishes, with over 80 species inhabiting small streams from Togo to Angola along the coastal plain, on the inland plateau, and the lowlands of the Congo River basin (Huber 2000).
Species delimitation in annual killifishes from the Brazilian Caatinga, the Hypsolebias flavicaudatus complex (Cyprin-odontiformes: Rivulidae): implications for taxonomy and conservation.
2001) also found molecular evidence of multiple colonization events in killifishes of the genus Fundulus.
Taxonomic diversity, origin, and conservation status of Bermuda killifishes (Fundulus) based on mitochondrial cytochrome b phylogenies.
Rivulus gransabanae, a new species of killifishes from Venezuela (Cyprinodontiformes: Rivulidae).