Map showing hypothesized paleodistribution of genus Fukuia (clade II includes Fukuia integra, Fukuia kurodai and Fukuia multistriata) in Early Miocene (23-18 Ma). There are Japanese archipelago, Sea of Japan and surrounding part of continental East Asia on the map.
Kameda Y. &amp; Kato M. (2011). "Terrestrial invasion of pomatiopsid gastropods in the heavy-snow region of the Japanese Archipelago". BMC Evolutionary Biology 11: 118. doi:10.1186/1471-2148-11-118. Figure 5B. Modified: paleodistribution of species removed, added colors of ocean, added white color of unmapped area.
Yuichi Kameda &amp; Makoto Kato (modified by User:Snek01)