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Chrysallida cossmanii
(Hornung & Mermod, 1924)
 
Chrysallida cossmanii
Maximum size:  2 mm shell length.

Identification:  This species has an elongate-oval shell with axial ribs and fine spiral striae. The profile varies from relatively slender to relatively robust.

Natural history:  Shells of Chrysallida cossmanii are moderately common in beach drift. According to Kay (1979), they are found in sand samples to depths of 65 m (213 ft) and the species is particularly common in highly protected sites on Oahu.

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

Taxonomic notes: This species is listed as Pyrgulina oodes in Kay, 1979. It's listed as Chrysallida aff. cossmanii in Severns, 2011. John Van Aartsen stated that: "The specimens are not O. oodes but seem to correspond with Chrysallida cossmanni (Hornung & Mermod, 1924). Note that the name is preoccupied by Chrysallida cossmanni  (Monterosato in Cossmann, 1921). The correct name is not known to me at present." (pers. com., 2012) So, although we are listing it at Chrysallida cossmanni (Hornung & Mermod, 1924) a new species name will probably need to be assigned.

Photo:  CP: Kahului Harbor, Maui; June 15, 2015.

Observations and comments:

Note 1:  ( )
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