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Biticinella


Classification: pf_mesozoic -> Rotaliporidae -> Biticinella
Sister taxa: Anaticinella, Biticinella, Pseudothalmanninella, Rotalipora, Thalmanninella, Ticinella
Daughter taxa (time control age-window is: 0-800Ma)
Biticinella breggiensis

Biticinella subbreggiensis

Biticinella sp.
Specimens which cannot be assigned to established species

Taxonomy

Citation: Biticinella Sigal, 1956
Rank: Genus
Basionym: Anomalina breggiensis
Type species: Anomalina breggiensis Gandolfi, 1942

Original description:

Translated from French: The study of samples from the Vraconian of Djebel Bejaoua, Tunisia yielded specimens belonging to the form described by Gandolfi under the name of Anomalina breggiensis that confirm a character already hypothesized on less good material: the chambers are prolonged, on both sides, by lamellar expansions which reveal, at their posterior edge, near the rim of the preceding chamber, an accessory intra-umbilical aperture; on one side, they are sometimes irregularly developed, as if this expresses the hidden asymmetry of the test
    This observation can be ranked as a morphological genus within the framework of a nomenclature of morphological plexuses. It belongs to a natural systematic group comprising certain Globigerina (sensu latu) with umbilical lamellar expansions but without accessory openings, the Ticinella (and Biticinella) with accessory openings, as well as the keeled Planomalina (at least Planomalina buxtorfi Gandolfi [Planulina buxtorfi, 1942]) and Thalmanninella-Rotalipora, respectively without, or with, accessory openings and with, or without, bilateral symmetry. This group is easily distinguished from another natural group, including other Globigerina which we can agree to consider as strains of Globotruncana, the Rotundina, the Globotruncana themselves and their globigerinoid forms, in which the lamellar expansions, when present, may well be homologous to those of the preceding group, but where the intraumbilical apertures (tunnel-shaped), when present, are not homologous to the preceding ones, because they are not accessory openings in intra- or sub-sutural position, but isolated portions of the umbilical part of the primary aperture.

Entries in the Catalog of original descriptions: Biticinella

Distinguishing features: Test with early whorls in a flat trochospiral coil, later whorls planispiral and biumbilicate, involute to partially evolute, sutures radial, depressed, peripheral outline lobulate, peripheral margin rounded and noncarinate; wall calcareous, moderately coarsely perforate; aperture a low and commonly asymmetrical, interiomarginal, umbilical-equatorial arch, parts of successive apertures may remain as relict supplementary apertures on one side of the test, the other side with accessory apertures opening into the posterior part of the chamber and bordered by a lip that is a continuation from that of the primary aperture.

Geological Range:
Last occurrence (top): within Albian Stage (100.50-112.95Ma, top in Albian stage). Data source: Total of range of species in this database
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: Total of range of species in this database

Plot of range and occurrence data:

References:

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs


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Biticinella compiled by the pforams@mikrotax project team viewed: 28-2-2021

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