Traits taxon details
original description
(of Cyrena shiroiensis Yabe & Nagao, 1926 †) Yabe, H.; Nagao, T.; Shimizu, S. (1926). Cretaceous Mollusca from the Sanchû-Graben in the Kwantô Mountainland, Japan. <em>Science reports of the Tohoku Imperial University. 2nd series, Geology.</em> 9(3): 33-76., available online at http://hdl.handle.net/10097/30201 page(s): 52, pl. 14, figs 4-6, 19, 20, 22, 25 [details] Available for editors 
original description
(of Cyrena shiroiensis var. alata Yabe & Nagao, 1926 †) Yabe, H.; Nagao, T.; Shimizu, S. (1926). Cretaceous Mollusca from the Sanchû-Graben in the Kwantô Mountainland, Japan. <em>Science reports of the Tohoku Imperial University. 2nd series, Geology.</em> 9(3): 33-76., available online at http://hdl.handle.net/10097/30201 page(s): 53, pl. 13, fig. 26, pl. 14, figs 15, 28 [details] Available for editors 
basis of record
Kozai, T.; Ishida, K.; Hirsch, F.; Park, S.-O.; Chang, K.-H. (2005). Early Cretaceous non-marine mollusc faunas of Japan and Korea. <em>Cretaceous Research.</em> 26(1): 97-112., available online at https://doi.org/10.1016/j.cretres.2004.11.003 [details] Available for editors 
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