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Helicina rhodostoma : ウィキペディア英語版 | Helicina rhodostoma
''Helicina rhodostoma'' is a species of tropical land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae. == Shell description == Robert John Lechmere Guppy (1868)〔Guppy R. J. L. (1868). "On the terrestrial mollusks of Dominica and Grenada, with an account of some new species from Trinidad". ''Annals and Magazine of Natural History'' (4)1: (429 )-442.〕 noted that this species is not found above 1000 m altitude.〔 Three names have been used for this species, but material by Robinson et al. (2009)〔 shows that the forms intergrade, illustrating the variability of the species. In general, populations from higher altitudes have a more pronounced columellar spine, and are more likely to have a red to reddish-orange aperture, as seen in typical ''Helicina rhodostoma''.〔 Populations from drier, coastal areas tend to lack a columellar spine, and the aperture may be white or yellow.〔 Juvenile specimens of this species often have a hairy periostracum, which is gradually worn off as the snail reaches sexual maturity.〔
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