The taxonomic diversity of the IKIP Dytiscidae holdings currently consists of 13 species in 10 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 Dr. Anders Nillson (see IKIP COLEOPTERA REPORT).

Genus Agabus
 
Agabus conspicuus [KU, UR, SI, KE]

Agabus japonicus [KU, UR, CH, SI, KE, RAS]
 

Genus Dytiscus
 
Dytiscus dauricus [KU, ZE, SH, IT, UR]
 
Genus Graphoderus
 
Graphoderus zonatus [UR]
 
Genus Hydroporus
 
Hydroporus morio [KE, RAS]

Hydroporus uenoi [UR]
 

Genus Hygrotus
 
Hygrotus impressopunctatus [KU]
 
Genus Ilybius
 
Ilybius apicalis [IT, UR]

Ilybius nakanei [KU]
 

Genus Nebrioporus
 
Nebrioporus simplicipes [KU]
 
Genus Oreodytes
 
Oreodytes sanmarkii [KU, SH]
 
Genus Platambus
 
Platambus pictipennis [KU]
 
Genus Rhantus
 
Rhantus suturalis [KU, SH]

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