Ammonia japonica (Hada 1931)

Japan, Shimoda Bay. Pl. 1 in Toyofuku et al., 2004. Figs 3.7, 4.7, 5.6 in Hayward, B.W.; Holzmann, M.; Tsuchiya, M. 2019. Combined molecular and morphological taxonomy of the beccarii/T3 group of the foraminiferal genus Ammonia. Journal of Foraminiferal Research 49: 367-389.

Image source: Cushman, J.A. 1915. A Monograph of the Foraminifera of the North Pacific Ocean. Part V. Rotaliidae. Bull. U.S. Nation. Mus 71: vii+87 pp.+31 pls.