The taxonomic diversity of the IKIP Elmidae holdings currently consists of a single species. This taxon is listed below and the islands on which it was collected, from south to north, is given in brackets (the islands are designated by two-letter Island Codes). All determinations were made by Dr. Anders Nillson (see IKIP COLEOPTERA REPORT).

Genus Optioservus
 
Optioservus kubotai [KU, SH, IT, UR]

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