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Plains topminnow
The plains topminnow (''Fundulus sciadicus'') is a species of freshwater topminnow found in North America. The fish has a small range within the United States of America which consists of two major populations.
==Description==
The plains topminnow is small, almost always shorter than 2.5 inches (6.35 cm).〔(【引用サイトリンク】url=http://ndis.nrel.colostate.edu/wildlifespx.asp?SpCode=010602 )〕 The fish has a flat head and an upturned (superior) mouth.〔 It lacks any distinctive markings.〔 The male plains topminnow’s fins are iridescent and have a red tip with blue-purple bands, as well as a gold stripe on the body. Both males and females are usually olive-brown with white on its underside.〔(【引用サイトリンク】url=http://www.dnr.state.mn.us/rsg/profile.html?action=elementDetail&selectedElement=AFCNB04170 )〕 The plains topminnow also has bronze reflections with faint blue-green cross-hatching on its back and sides.〔 Its fins are colorless or yellowish in immature fish, females and non-breeding males.〔 There are no black bars on the fish’s body, which makes it distinguishable from the banded killifish, a more common species, which is often found in the same habitats as the plains topminnow.〔〔 Two other distinct features of the plains topminnow are its rounded caudal fin and the absence of an externally visible lateral line.〔 The plains topminnow has 33 to 37 ctenoid scales in its lateral line. The dorsal fin has 9-12 rays, the anal fin 12-15 rays and the origin of the anal fin is slightly forward of the dorsal fin, the pelvic fin is small and in the abdominal position.〔 The plains topminnow also has a squared caudal fin, a trait that many topminnows and killifish share. There is little sexual dimorphism between males and females except during breeding season, when males have bright orange-red fin tips.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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