Home > Invertebrates > Bivalves > Isognomon californicus

Updated 8/20/2025

Family Isognomonidae

HAWAII - ENDEMIC

Isognomon californicus   

Kapoho Point, Kailua, Oahu

 

Makai Pier, Waimanalo, Oahu

Diamond Head, Oahu

 


Ho'okena, Hawaii

Kuki'o, Hawaii
   

BLACK PURSE SHELL   NAHAWELE

Common as colonies in rocky crevices of the splash zone.  The dull black shells have jagged layers and attain 1.5 inch.   Endemic to Hawaii.  The species name was given before a labeling error was discovered.  Formerly known as Isognomon californicum.