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Siphonaria
sp. #1
 
Siphonaria sp. #1: shell
Maximum size:  11 mm shell length.

Identification:  The shell of this species is highly flattened with the apex set well to the left of the midline and the posterior ribs noticeably better developed than the anterior ribs. (Note 1).

Natural history:  Shells of Siphonaria sp. #1 are moderately common in beach drift.

Distribution:  Big Island, Maui, Kahoolawi and Oahu.

Taxonomic notes:  This species probably corresponds to Siphonaria normalis form chirura as illustrated in Pilsbry, 1921 and Edmondson, 1946.

Photo:  CP: largest 11 mm: composite photo, two shells; beach drift, Mokuleia Bay, Maui; fall, 1984.

Observations and comments:

Note 1:  While shells of Siphonaria normalis vary considerably from site to site but are fairly uniform at a given site, the shells of Siphonaria sp. #1 are consistent in form throughout coastal Maui where they are sympatric with the "typical" form of S. normalis at each location. This may support the suggestion that it's a distinct species.
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