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Rissoella
cf. confusa
Ponder & Yoo, 1977
 
Rissoella cf. confusa
Maximum size:  1 mm shell length (Kay, 1979).

Identification:  This species has a very small, transparent-white shell with an angled umbilicus. Live animals are black, spotted with chrome-yellow (usually in a "butterfly" pattern).

Natural history:  Shells of Rissoella cf. confusa are moderately rare in beach drift. However, live animals are common on reef flats and in tide pools at moderately protected to moderately exposed sites. They also occasionally occur in large numbers on sand in shallow basins. (Note 1)

Distribution:  Maui, Oahu and Midway: Rissoella confusa is widely distributed in the western and central Pacific.

Taxonomic notes: Shells are similar to those of  R. confusa found in Japan. (Kay, 1979)

Photo:  Invert Team: 2017 MarineGeo; Kaneohe Bay, Oahu; May 30, 2017.

Observations and comments:

Note 1:  Dozens are often found in single algae washes and hundreds in skimmed sand samples (if there's a bloom).
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