The taxonomic diversity of the IKIP Ephemerellidae holdings currently consists of five species in four genera. A check-list of these taxa, arranged alphabetically, is provided below and the islands on which they were collected, from south to north, is given in brackets (the islands are designated by two-letter Island Codes). All determinations were made by Tatyana Tiunova (see IKIP EPHEMEROPTERA REPORT).

Genus Cincticostella
 
Cincticostella okumai (Gose) [KU]
 
Genus Drunella
 
Drunella cryptomeria (Imanishi) [KU]

Drunella trispina (Ueno) [KU]
 

Genus Ephemerella
 
Ephemerella ignita Poda [KU]
 
Genus Seratella
 
Seratella setigera Bajikova [KU]

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