Western Mosquitofish Gambusia Affinis ILLINOIS RANGE

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Western Mosquitofish Gambusia Affinis ILLINOIS RANGE

western mosquitofish Gambusia affinis Kingdom: Animalia FEATURES Phylum: Chordata The western mosquitofish male grows to about one Class: Osteichthyes inch in length, while the female attains a length of Order: Cyprinodontiformes about two inches. A dark, teardrop-shaped mark is present under each eye. Black spots can be seen on Family: Poeciliidae the dorsal and tail fins. The back is gray-green to ILLINOIS STATUS brown-yellow with a dark stripe from the head to the dorsal fin. The sides are silver or gray with a common, native yellow or blue sheen. Scales are present on the head, and scales on the body have dark edges, giving a cross-hatched effect. These fish tend to die in the summer that they become mature. BEHAVIORS The western mosquitofish may be found in the southern one-half of Illinois. This fish lives in areas of little current and plentiful vegetation in swamps, sloughs, backwaters, ponds, lakes and streams. The western mosquitofish reproduces three or four times during the summer. Fertilization is internal. After mating, sperm is stored in a pouch within the female and may be used to fertilize several broods. The eggs develop inside the female and hatch in three to four weeks. Young are born alive. A brood may contain very few or several hundred fish. Young develop rapidly and may reproduce in their first summer. The western mosquitofish swims near the ILLINOIS RANGE surface, alone or in small groups, eating plant and animal materials that includes insects, spiders, small crustaceans, snails and duckweeds. © Illinois Department of Natural Resources. 2020. Biodiversity of Illinois. Unless otherwise noted, photos and images © Illinois Department of Natural Resources. © Bryce Gibson/Engbretson Underwater Photography Aquatic Habitats rivers & streams; lakes, ponds & reservoirs; swamps & sloughs Woodland Habitats none Prairie and Edge Habitats none © Illinois Department of Natural Resources. 2020. Biodiversity of Illinois. Unless otherwise noted, photos and images © Illinois Department of Natural Resources..

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A REVISION of the GAMBUSIA NICARAGUENSIS SPECIES GROUP (PISCES:POECILIIDAE) by William L. Fink ABSTRACT in Addition to Gambusia
Reprinted from PUBLICATIONS OF THE GULF COAST RESEARCH LABORATORY MUSEUM 2:47-77, June 18, 1971 A REVISION OF THE GAMBUSIA NICARAGUENSIS SPECIES GROUP (PISCES:POECILIIDAE) by William L. Fink ABSTRACT In addition to Gambusia nicaraguensis, the species group includes G. wrayi, G. mela pleura and G. his paniolae sp. nov. G. gracilior is a junior synonym of G. wrayi and G. dominicensis is found to be a member of another species group. A key and zoogeographical notes are provided for the group. Rivas (1963) published on subgenera and species groups in the genus Gambusia. He used only gonopodial characters in defining his groups, and I believe that his system is both natural and practical. Subsequent investigation has shown a need to review his findings and to make adjust- ments in the system. I have found that G. dominicensis is a member of another species group and that the species referred to as dominicensis by Rivas (1963) is actually undescribed. Otherwise, I accept his G. nicara- guensis species group and feel that its revision will help clarify other prob- lems within the genus. METHODS.—Methods are those of Fink (1971). Abbreviations are as follows: ANSP - Academy of Natural Sciences of Philadelphia; BMNH - British Museum (Natural History); GCRL - Gulf Coast Re- search Laboratory; UMMZ - University of Michigan Museum of Zoology; USNM - United States National Museum. Unless otherwise noted, lengths are standard length (SL); descriptions of coloration are from alcoholic specimens; all material examined is not included in the tables. 47 DIAGNOSIS OF THE SPECIES GROUP.—Length of gonopodium about one-third of SL.
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