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Subspecies Globigerinatheka subconglobata euganea Proto Decima & Bolli 1970 |
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| Discussion / Comments: |
Toumarkine & Luterbacher (1985):
G. subconglobata euganea is considered to have evolved from G. subconglobata curryi and to be the ancestral form of Orbulinoides beckmanni. It possesses a more spherical test,more numerous but smaller apertures in the final chamber and is more tightly coiled than G. subconglobata curryi. Occasionally it can present spiral sutural apertures in the preceding 1 to 3 large chambers. In the overall shape of the test G. subconglobata euganea is similar to Orbulinoides beckmanni from which it differs in the lack ofareal apertures and spiral sutural apertures between the early chambers. It differs from G. subconglobata luterbacheri by a more spherical and regular test, by less pronounced sutures and by a smoother aspect of the test. The sizes of the tests are more or less the same (0.5 to 0.6 mm). |
| Systematics: |
15
Classis Foraminifera
Genus Globigerinatheka
Subspecies Globigerinatheka subconglobata euganea
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| Synonym list: |
Toumarkine & Luterbacher (1985):
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| Was used in synonym list of: |
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| References: |
Proto Decima,F. and Bolli,H.M. (1970):
Evolution and variability of Orbulinoides beckmanni (Saito) . Ecoglae geologicae Helvetiae Vol. 63 p. 883-905
Toumarkine,M. and Luterbacher,H.P. (1985):
Paleocene and Eocene Planktic Foraminifera.
In: Plankton Stratigraphy p. 87-154
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