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''Pomacea haustrum'', common name the titan applesnail, is a species of large freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the applesnails. == Original description == ''Pomacea haustrum'' was originally described under the name ''Ampullaria haustrum'' by Lovell Augustus Reeve in his book ''Conchologia Iconica'', in 1856.〔 In Reeve's original text, (the type description) reads as follows: It is difficult to identify even the general region of the type locality for this species.〔 The type locality was given as the Río Marañón, Brazil, but this river is in Peru, joining with the Rio Ucayali above Iquitos to become the Rio Solimões, which in turn joins with the Rio Negro to become the Amazon River of Brazil.〔 Some of the first Europeans to explore the region in the sixteenth century, however, referred to the Amazon River as El Río Marañón, and some nineteenth century maps refer to the entire Amazon as the Marañón.〔 It is likely that the Río Marañón of one collector was not the same as the Río Marañón of another. It was considered a synonym of ''Pomacea canaliculata'' by Thompson (1997)〔Thompson F. G. (1997). "''Pomacea canaliculata'' (Lamarck 1822) (Gastropoda, Prosobranchia, Pilidae): a freshwater snail introduced into Florida, USA". ''Malac. Rev. 30: 91.〕 based on shell morphology, but tentatively retained as a separate species by Cowie & Thiengo,〔Cowie R. H. & Thiengo S. C. (2003) "The apple snails of the Americas (Mollusca: Gastropoda: Ampullariidae: ''Asolene'', ''Felipponea'', ''Marisa'', ''Pomacea'', ''Pomella''): a nomenclatural and type catalog". ''Malacologia'' 45: 41-100.〕 because of its reported production of green eggs.〔 Phylogenetic analyses by Rawlings et al. (2007) confirmed its species status.〔 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「Pomacea haustrum」の詳細全文を読む スポンサード リンク
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