Where: Japan (38.7° N, 141.5° E: paleocoordinates 49.7° N, 152.8° E)
• coordinate estimated from map
• small collection-level geographic resolution
When: Niranohama Formation (Shizukawa Group), Hettangian (201.3 - 199.3 Ma)
• bed-level stratigraphic resolution
Environment/lithology: marine; lithified lithology not reported
Size classes: mesofossils, microfossils
Preservation: mold/impression
Primary reference: M. Goto, N. Kuga, and K. Hachiya. 1991. On the hybodont elasmobranch teeth of three genera from the Mesozoic of Japan. Journal of the Geological Society of Japan 97(9):743-750 [M. Clapham/M. Clapham/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 119673: authorized by Matthew Clapham, entered by Matthew Clapham on 31.10.2011, edited by Bethany Allen
Creative Commons license: CC BY (attribution)
Taxonomic list
| Bivalvia | |
Volsella bakevelloides n. sp.
Volsella bakevelloides n. sp. Hayami 1958 mussel MM 2719 (holotype), right valve; MM 2720, left valve; MM 2721, left internal mould
| |
Pteria kitakamiensis n. sp.
Pteria kitakamiensis n. sp. Hayami 1958 pearl oyster MM 2737 (holotype), right external mould; MM 2738, left internal mould
| |
| Chondrichthyes | |
|
Asteracanthus sp. Agassiz 1836 elasmobranch | |