Locality 3, Ajimu Basin, Oita Prefecture (Pliocene of Japan)

Where: Japan (33.4° N, 131.3° E: paleocoordinates 33.9° N, 130.8° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Tsubusagawa Formation, Piacenzian (3.6 - 2.6 Ma)

• A few meters below radiometric age of 2.8 +/- 0.3 Ma (although fault present in between)

• bed-level stratigraphic resolution

Environment/lithology: mire or swamp; lithified, sandy siltstone

• "marshy area"

Size classes: macrofossils, mesofossils

Preservation: original chitin

Primary reference: M. Hayashi, K. Yahiro, and E. Kitabayashi. 2003. Fossil insects and their paleoenvironments of the Pliocene Tsubusagawa Formation in Ajimu Basin, Oita Prefecture, Kyushu, Japan. Bulletin of the Mizunami Fossil Museum 30:167-173 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 165742: authorized by Matthew Clapham, entered by Matthew Clapham on 27.01.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Dicondylia -
Coleoptera indet. Linnaeus 1758 beetle
 Coleoptera - Gyrinidae
Gyrinus sp. Geoffroy 1762 whirligig beetle
 Coleoptera - Dytiscidae
Ilybius sp. Erichson 1832 predaceous diving beetle
 Coleoptera - Carabidae
Carabidae indet. Latreille 1802 ground beetle
Oodini indet. Laferte-Senectere 1851 ground beetle
Elaphrus sp. Fabricius 1775 ground beetle
 Coleoptera - Chrysomelidae
Chrysomelidae indet. Latreille 1802 leaf beetle
Donaciinae indet. Kirby 1837 leaf beetle
Donacia spp. Fabricius 1775 leaf beetle
 Coleoptera - Curculionidae
Curculionidae indet. Latreille 1802 snout beetle
 Coleoptera - Scarabaeidae
Onthophagus sp. Latreille 1802 scarab beetle
 Coleoptera - Hydrophilidae
Coelostoma sp. Brullé 1835 water scavenger beetle