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Trivirostra edgari (Shaw, 1909)
 
Trivirostra edgari: young
 
shell size
shows mature shells with form typical of T. hordacea from each site on left and mature shells with form typical of T. edgari from each site on right: Maalaea Bay T. hordacea range from 3.5-4.3 mm. Maalaea Bay T. edgari range from 6-8 mm. La Perouse Bay T. hordacea range from 4-6 mm. La Perouse Bay T. edgari is a single 5.5 mm shell.

Photo:
  CP: left 2 groups--beach drift; Maalaea Bay, Maui; 1979: right 2 groups--beach drift, La Perouse Bay, Maui; 1979.
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