Species found in “Japan, Amami-O-Shima” (3)

Heterostegina depressa

Order “Rotaliida” > Family “Nummulitidae” > Genus “Heterostegina

Original description Orbigny, A. D’, 1826, Annales du Museum d’Histoire Naturelles, Paris, 7, 1-275
Description Hohenegger, J., Yordanova, E., Hatta, A., 2000, J. Foram. Res., 30, 3-28
Further reference Holzmann M., Hohenegger J., Pawlowski J., 2003, J. For. Res., 33, 277-284 (["127 KB"])
Further reference Holzmann, M., Berney, C., Hohenegger, J., 2006, Symbiosis, 42, 93-101 (["3.03 MB"])
Description Hottinger, L., 1977, Mémoires du Muséum National d`Histoire Naturelle, Paris., 40, Série C, 1-159

General description

Central part of the test is thickened, early chambers are undivided, later ones are divided by secondary septa. Diatom symbionts lead to a brownish colour in living specimens.

Representative pictures

Heterostegina depressa Heterostegina depressa Heterostegina depressa
6 specimens

Planostegina longisepta

Order “Rotaliida” > Family “Nummulitidae” > Genus “Planostegina

Original description Zheng, S., Y., 1979, Stud. Mar. Sin., 15, 1-27
Further reference Holzmann, M., Berney, C., Hohenegger, J., 2006, Symbiosis, 42, 93-101 (["3.03 MB"])
Description Hohenegger, J., 2004, J. For. Res., 34, 9-33

General description

Very flat and evolute test with granular surface ornamentation. Chambers are divided into chamberlets by secondary septa. Diatom symbionts cause brownish colour in living specimens.

Representative pictures

Planostegina longisepta Planostegina longisepta, Japan, Sesoko Planostegina longisepta, Japan, Sesoko
1 specimen