none
Geological Time: Quaternary Holocene recent
holotype
View of a specimen of Cassidulina alternans Yabe & Hanzawa, 1925
The identification is based upon:
, : Yabe, H.; Hanzawa, S. (1925). Globigerina ooze from the sea lying south of Okinawa Islands: Jap. Jour. Geol. Geogr., vol. 4, nos. 1-2, pp. 47-54. Plate , Fig.