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.
| | | Praeplanctonia globifera Georgescu 2009 |
| | | Praeplanctonia quasiplanctonica Georgescu 2009 |
Current identification:
Diagnosis.– Test biserial throughout or with a short triserial juvenile stage and biserial in the adult; aperture sub- terminal bordered by a short rim and provided with a toothplate; apertural face with supplementary suture; chamber surface smooth. Description.– Test twisted, biserial throughout or with an early triserial stage and biserial in the adult. Chambers are globular to subglobular, overlapping at various rates. Sutures are distinct and depressed. Aperture subcircular and subterminal in position and bears a toothplate and is bor- dered by an asymmetrical rim. A supplementary suture is present on the apertural face, which connects the aper- ture base with the suture between the penultimate and last-formed chamber. Chamber surface is smooth. Test wall is calcitic, hyaline and nannoperforate; pore shape is elongate to circular.
Original Description
Etymology: The name suggests that this genus is ancestral to the planktic foraminifera with serial chamber arrangement.
Extra details from original publication
Remarks.– Praeplanctonia nov. gen. is characterized by high variability of the morphological features. The test may have an early triserial stage, becoming biserial when adult or is biserial throughout; the triserial-biserial tests present general resemblances with some Neobulimina Cushman & Wickenden, 1928 species of the late Albian, such as N. irregularis (Cushman & Parker, 1936), N. numerosa (Vasilenko, 1961), N. vridhachalensis (Rasheed & Govindan, 1968) and N. canadensis var. beta (Mello,1969). By contrast to Neobulimina, has twisted tests and therefore can be considered morphologically closer to Cassidella Hofker, 1951 and Fursenkoina Loeblich & Tappan, 1961. Praeplanctonia differs from these two in having an early triserial stage, which is occasionally developed, subterminal aperture rather than situated at the base of the last-formed chamber and the presence of the supplementary suture on the apertural face.
References:
 |
Praeplanctonia compiled by the pforams@mikrotax project team viewed: 21-9-2021
Short stable page link: https://mikrotax.org/pforams/index.php?id=132497 Go to Archive.is to create a permanent copy of this page - citation notes |
Comments
(0)