出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/05/12 20:42 UTC 版)
Neothauma tanganyicense is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Viviparidae. This is the only species in the genus Neothauma . It is only found in Lake Tanganyika, where it is the largest gastropod, and occurs in all four of the bordering countries — Burundi, the Democratic Republic of the Congo, Tanzania, and Zambia — although fossil shells have been discovered at Lake Edward and in the Lake Albert basin .