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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Page springsnail ： ウィキペディア英語版 Page springsnail The Page springsnail (''Pyrgulopsis morrisoni'') is a species of freshwater snail in the family Hydrobiidae, the mud snails. It is endemic to Arizona in the United States, where it is known only from the Upper Verde River drainage in Yavapai County.〔 This snail has an ovate to conical shell no more than 2.9 millimeters tall. The species is sexually dimorphic, with females generally larger than males.〔(''Pyrgulopsis morrisoni''. ) Invertebrate Abstracts. Arizona Game and Fish Department.〕 This aquatic snail lives in a system of springs along a tributary of the Upper Verde River known as the Oak Creek Springs Complex. Many of the waterways in the area are known locally as cienegas. The snail occurs most often in waters with substrates of gravel and pebbles. It is most common around spring vents and in shallower parts of the springs.〔Martinez, M. A. and D. M. Thome. (2006). (Habitat usage by the Page springsnail, ''Pyrgulopsis morrisoni'' (Gastropoda: Hydrobiidae) from central Arizona. ) ''The Veliger'' 48(1) 8–16.〕 The entire population of this snail occurs within a two-mile radius. It is known from six sites, a seventh having been recently extirpated. Loss of habitat occurred when a local fish hatchery was renovated and when ditches were dug nearby, changing water flow rates. Habitat degradation is an ongoing threat to all six remaining sites. The snail may also be threatened by the introduction of the predatory mosquitofish (''Gambusia affinis'').〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Page springsnail」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.