ammonites
Zhonghuaspira yokoyamai Hayasaka 1943 (snail)

Gastropoda - Murchisoniina - Gosseletinidae

Alternative combination: Pleurotomaria 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

Belongs to Zhonghuaspira according to A. Nützel 2012

Sister taxa: Guizhouspira convexa, Guizhouspira gibbicircella, Guizhouspira gibbicircelloides, Guizhouspira sequens, Guizhouspira venusta

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

Ecology: facultatively mobile epifaunal suspension feeder

Average measurements (in mm): shell diameter 125.2