new trilobite collection, Gomi Quarry (Silurian of Japan)

Where: Skikoku, Japan (33.5° N, 133.2° E: paleocoordinates 33.5° N, 133.2° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ludlow (427.4 - 423.0 Ma)

• Cerauroides orientalis horizon, in stage G3 (Early Ludlovian)

Environment/lithology: reef, buildup or bioherm; lithified reef rocks and lithified, red shale

• submarine talus deposits along the outer slope of the wave resistant reef front [redeposited]
• limestone breccia with red shale

Size class: macrofossils

Collected by Y. Sako, T. Mizobuchi

Collection methods: surface (in situ),

Primary reference: T. Kobayashi, J. Katto, and T. Hamada. 1984. New observations of Shiroishi-ohsawa, Mt. Yokokura, Kochi Prefecture with palaeontological studies on the cephalopods and trilobites from the locality. Research Report of the Kochi University 32:235-258 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188692: authorized by Melanie Hopkins, entered by Melanie Hopkins on 13.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Corynexochida - Styginidae
? Illaenoides magnisulcatus n. sp.2 Kobayashi and Hamada 1986 trilobite
? Illaenoides abnormis n. sp.2 Kobayashi and Hamada 1986 trilobite
 Corynexochida - Illaenidae
Bumastus agmakros n. sp. Kobayashi et al. 1984 trilobite
Bumastus glomerosus3 Kobayashi and Hamada 1974 trilobite
Bumastus kattoi n. sp. Kobayashi et al. 1984 trilobite
Bumastus sakoi n. sp. Kobayashi et al. 1984 trilobite
 Phacopida - Phacopidae
? Eophacops sp. Delo 1935 trilobite
 Phacopida - Encrinuridae
Encrinurus similis n. sp.1 Kobayashi and Hamada 1985 trilobite
Encrinurus subtrigonalis n. sp.1 Kobayashi and Hamada 1985 trilobite
? Dindymene megacranidia n. sp.1 Kobayashi and Hamada 1985 trilobite
Staurocephalus sp. Barrande 1846 trilobite
 Phacopida - Cheiruridae
Pseudocheirurus gomiensis n. sp.1 Kobayashi and Hamada 1985 trilobite
Ichiyamella subglobula n. sp.2 Kobayashi and Hamada 1986 trilobite
Sphaerexochus hiratai2 Kobayashi and Hamada 1974 trilobite
Cerauroides orientalis3 Kobayashi and Hamada 1973 trilobite
  - Scutelluidae
? Opoa trinodosa n. sp.2 Kobayashi and Hamada 1986 trilobite
Japonoscutellum geniculatum n. sp.1 Kobayashi and Hamada 1985 trilobite
Japonoscutellum japonicum2 Kobayashi and Hamada 1965 trilobite
two subspecies: puteatum and laticephalum
Japonoscutellum tunidum n. sp.3 Kobayashi and Hamada 1987 trilobite
 Proetida - Proetidae
Cyphoproetus latiaxis n. sp.2 Kobayashi and Hamada 1986 trilobite
 Lichida - Lichidae
Metaleiolichas tuberculatus n. sp.3 Kobayashi and Hamada 1987 trilobite
Paraleiolichas globulus n. sp.3 Kobayashi and Hamada 1987 trilobite
? Apolichas sp. Kobayashi and Hamada 1974 trilobite
Dicranopeltis tricornis n. sp.2 Kobayashi and Hamada 1986 trilobite