Rissoella cf. confusa Ponder & Yoo, 1977
|Maximum size: 1 mm shell
length (Kay, 1979).
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).
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)
Maui, Oahu and Midway: Rissoella
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:
1: Dozens are often found in single algae washes and hundreds in skimmed sand samples (if there's a bloom).