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''Crepidula plana'', common name the eastern white slippersnail, is a species of sea snail, a marine gastropod mollusk in the family Calyptraeidae, the slipper snails or slipper limpets, cup-and-saucer snails, and hat snails. This species is characterized by a flat white shell, a white body and development that includes a planktotrophic larval stage. This species often occurs inside large gastropod shells that are inhabited by hermit crabs. Due to this habit the shells are often very flat or even recurved. Like all slipper snails ''Crepidula plana'' are filter feeders. The brood their offspring in clusters of transparent capsules between the substrate, the propodium and the neck. ''Crepidula plana'' is native to the east coast of North America, where it ranges from Canada to North Carolina. It has also been reported as introduced into San Francisco Bay. Reports of this species in the Gulf of Mexico or south of the US are incorrect and result from taxonomic confusion with other flat what species of Crepidula (of which there are many). ==Distribution== The distribution of ''Crepidula plana'' is often reported to range from 48°N to 38°S; 97.75°W to 34.9°W.〔 Many of these locations are incorrect, and have not been updated based on recent taxonomic revisions in the group. The distribution is often reported to include: * Canada: Nova Scotia, New Brunswick〔 * USA: Massachusetts, New York, New Jersey, Maryland, Virginia, North Carolina, South Carolina, Georgia, East Florida, West Florida, Louisiana, Flower Garden Banks (East & West), Texas〔 * Mexico: Tamaulipas, Tabasco, Veracruz, Campeche State, Cayo Arcas, Campeche, Yucatán State, Campeche Bank, Alacran Reef, Quintana Roo〔 * Costa Rica〔 * Panama〔 * Colombia〔 * Venezuela: Gulf of Venezuela, Sucre, Isla Margarita〔 * Bermuda〔 * Jamaica〔 * Virgin Islands: St. Croix〔 * St. Vincent & the Grenadines: Grenada〔 * Surinam〔 * Brazil: Amapa, Ceara, Pernambuco, Rio de Janeiro, São Paulo〔 However, DNA sequence data, allozyme data and developmental data have provided evidence since the 1980s that the flat white ''Crepidula'' from Eastern North America is composed to at last 3 distinct species. ''C. plana'' actually ranges only from Nova Scotia and New Brunswick south to Georgia or northern Florida. Records of ''C. plana'' in Southern Florida and the Gulf of Mexico are almost certainly misidentified ''C. atrasolea'' or ''C. depressa''. The identity of the flat white ''Crepidula'' that occur south of the Gulf of Mexico needs to be re-examined as they are certainly not ''C. plana''. 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「Crepidula plana」の詳細全文を読む スポンサード リンク
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