Onobops crassus is a species of very small aquatic snail, an operculate gastropod mollusc in the family Cochliopidae.
Description The maximum recorded shell length is 2.7 mm.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. .
Habitat Minimum recorded depth is 0 m. Maximum recorded depth is 0 m.
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