Hypselostoma megaphonum (van Benthem Jutting, 1950) Boysidia megaphonum is a species of terrestrial pulmonate gastropod in the family Gastrocoptidae.

[2][3] The distribution of Boysidia megaphonum is restricted to a narrow region (0.25 km2) of karstic moist-forest near Bukit Charas, Pahang, in Peninsular Malaysia.

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