Alternative combinations: Biarmeaspira yokoyamai, Pleurotomaria yokoyamai, Zhonghuaspira yokoyamai
Full reference: I. Hayasaka. 1943. On some Permian gastropods from Kinsyozan, Akasaka-mati, Gihu Prefecture Part I. Memoirs of the Faculty of Science, Taihoku Imperial University, Series III 1:23-48
Sister taxon: Nipponomaria anatolica
Type specimen: Its type locality is Kinshozan, Kuro zone, Akasaka, Gifu Prefecture, which is in a Capitanian carbonate limestone in the Akasaka Formation of Japan
Average measurements (in mm): shell diameter 125.2
• Permian of Japan (6 collections)
Total: 6 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.