Pachymelon benthicola Dell, 1963 Alcithoe benthicola is a species of very large deepwater sea snail, a marine prosobranch gastropod mollusc in the family Volutidae, the volutes.

[1] This species attains a size of 260 mm, its diameter 145 mm.

This marine species is endemic to New Zealand occurs off Northland in deep water: 400–800 metres.

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