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Cylichna biplicata
(A. Adams in Sowerby, 1850)
 
Cylichna biplicata
Maximum size:  10 mm (extrapolated from shell length).

Identification:  This species has an elongate, straight-sided shell with prominent spiral striae and a strong columellar fold. In living animals, the otherwise thin, golden-brown periostracum fills the striae giving the shell a narrowly banded appearance. The animal is translucent cream.

Natural history:  Our only two live Cylichna biplicata were found in sand samples taken in Halimeda kanaloana beds at depths of 10-20 m (33-55 ft). However, dead shells suggest that it's probably a moderately common burrowing species at such depths.

Distribution:  Maui: widely distributed in the western & central Pacific.

Taxonomic notes:  Shells are present in various mixed lots at the Bishop Museum. It's listed in Severns, 2011 as Eocylichna braunsi (Yokoyama, 1920).

Photo:  CP: 6 mm: Airport Beach, Maui; Oct. 22, 1994.

Observations and comments:

Note 1:  ( )
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