Listing species

Operculina ammonoides

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

Original description Gronovius, L., T., 1781, Haak et Cie (Leyden), Tome 3., 241-380
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)

General description

Semiinvolute test with undivided chambers and ornamented surface.Brownish colour in living specimens due to diatom symbionts.

Representative pictures

Operculina ammonoides Opercilina ammonoides, Japan, Sesoko Operculina ammonoides, Japan, Sesoko
2 specimens

Operculina complanata

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

Original description DeFrance, M., J., L., 1822, Tome 25, Dictionnaire des Sciences Naturelles, F. G. Levrault, Paris, 453
Description Hohenegger, J., Yordanova, E., Hatta, A., 2000, J. Foram. Res., 30, 3-28
Further reference Holzmann, M., Berney, C., Hohenegger, J., 2006, Symbiosis, 42, 93-101 (3.03 MB)

General description

Flat test, semiinvolute to evolute, scarcely covered with knobs. Chambers are undivided. Living specimens show a brownish colour caused by diatom symbionts.

Representative pictures

Operculina complanata
4 specimens

Operculina discoidalis

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

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., Berney, C., Hohenegger, J., 2006, Symbiosis, 42, 93-101 (3.03 MB)

General description

Involute test with prominent surface ornamentation and undivided chambers. Brownish colour in living specimens caused by diatom symbionts.

Representative pictures

Operculina discoidalis
2 specimens

Operculina elegans

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

Original description Cushman, A., J., 1921, U. S. Nat. Mus. Bull. Washington, D. C., USA, 4
Further reference Holzmann, M., Berney, C., Hohenegger, J., 2006, Symbiosis, 42, 93-101 (3.03 MB)
Description Yordanova, E., Hohenegger, J., 2004, Micropaleontology, 50, 149-177

General description

Flat semiinvolute to evolute tests and nearly smooth test surfaces, scarcely covered with knobs. O. elegans resemblesin these aspects O.complanata. What distinguishes the two species are septal flaps that are smooth in O. elegans and folded in O. complanata. Brownish colour in living specimens caused by diatom symbionts.

Representative pictures

Operculina elegans
1 specimen