The families Marginellidae and Cystiscidae (formerly lumped under Marginellidae) are small
prosobranch snails (usually less than 5 mm) that often have transparent shells. In many cases,
the mantle is brightly colored and shows through the shell allowing
them to be mistaken for cephalaspideans. They can be distinguished from
the latter by the bulbous eyes at the bases of their cephalic tentacles.
Several other families of prosobranchs also have small members in which
the mantle colors show through the shell.
Representative Hawaiian species:
Crithe sp. #1
CP: Maliko Bay, Maui
April 19, 2008
Cystiscus sandwicensis CP: Hekili Point, Maui
Oct. 5, 2002
un. cysticid sp. #1
CP: Airport Beach, Maui
April 12, 2012