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.
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References in periodicals archive ?
Historical biogeography of Cynolebiasine annual killifishes inferred from dispersal-vicariance analisys.
Pattern recognition of cytogenetically divergent South American killifishes has been used to propose models of conservation in threatened species Austrolebias [38].
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).
In killifishes, the breeding systems are usually characterized by large groups of fish aggregating on the breeding grounds, with males adopting conditional tactics that switch between territory defense, satellite positions, and sneak spawning (Kodrich-Brown, 1986, 1988; Leiser and Itzko-witz, 2002, 2004).
Phylogeny and classification of the Cyprinodontidae revisited (Teleostei: Cyprinodontiformes): are Andean and Anatolian killifishes sister taxa?
Banded killifish (Figure 63) Freshwater, and often in brackish water; native; largely coastal, widespread in Atlantic, Delaware River and Delaware Bay, drainages; some of the records on the immediate Atlantic shore are perhaps of misidentified other killifishes, especially of the mummichog; occurs in the Pinelands in some tidal waters; often common or abundant.
Overall, numerical dominance in the fish assemblage has shifted from minnows (family Cyprinidae) to pupfishes and killifishes (family Cyprinodontidae).
These organelles were first documented in the double cones of killifishes and guppies and are known to be of mitochondrial origin (7).
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).