This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
Current identification:
Diagnosis.– Species of Praeplanctonia nov. gen. with relatively smaller proloculus and lower rate of chamber increase in size. Description.–Test twisted, small-sized with biserial chambers arrangement throughout (Pl. 4, Figs 14, 19, 20) or sometimes with a short triserial stage in the earlier part of the test (Pl. 4, Figs 9, 12, 13, 16, 17). Proloculus is relatively small, its diameter being between 11 and 14 µm. Chambers are globular in the earlier part of the test, subglobular in the adult and increase slowly in size as added. Sutures are distinct, depressed and straight to slightly curved. Aperture is elliptical in shape and subterminal in position; it is bordered by an asymmetrical and imperforate rim (Pl. 4, Fig. 10) and bears a toothplate (Pl. 4, Figs 16-20). Chamber surface is smooth. Test wall is calcitic, hyaline, nannoperforate with elongate to circular pores, pore dimension ranging between 0.2 and 0.5 µm (Pl. 4, Fig. 11). Remarks.– Praeplanctonia quasiplanctonica differs from any species of serial planktic foraminifera in the position of the aperture, which is subterminal and not interiomarginal and by having the aperture provided with a well-developed toothplate, which is absent in the planktics with serial chamber arrangement.
Original Description
Size:
Etymology:
Extra details from original publication
Georgescu, M. D. (2009a). On the origins of Superfamily Heterohelicacea Cushman, 1927 and the polyphyletic nature of planktic foraminifera. Revista Española de Micropaleontología. 41: 107-144. gs References:

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Praeplanctonia quasiplanctonica compiled by the pforams@mikrotax project team viewed: 10-7-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=132499 Go to Archive.is to create a permanent copy of this page - citation notes |
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