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GenusRhiostomaBenson, 1860 Synonyms. For a list of the synonyms and usage of the name, see Tongkerd et al. (2023). Type species. Rhiostoma haughtoni Benson, 1860 by original designation in Benson (1860: 96). Remarks. Rhiostoma is diagnosed by a small to large, heliciform to depressed shell. The detached whorl is absent, or present (short to long, curved, and descending). A prominent breathing device of various forms is present. Peristome double; lip thickened and expanded. Shell color variable, ranging from uniform to zigzag patterns. Operculum calcareous, cup-shaped, anticlockwise multispiral, with an elevated lamella.
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Prasankok et al. (2026) studied this question.
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