Bittiolum varium, common name the grass cerith, is a species of sea snail, a marine gastropod mollusk in the family Cerithiidae.
Distribution Bittiolum varium occurs in shallow waters ( depth) of the Western Atlantic between the East Coast of the United States (Maryland) and Brazil.
Description The maximum recorded shell length is 6.5 mm.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLOS One 5(1): e8776. .
Habitat The minimum recorded depth for this species is 0 m; maximum recorded depth is 11 m.
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