Praeglobotruncana algeriana

Taxonomy

Original description: Translated from French: Diagnosis: We quote here the very thorough diagnosis given by M. Reichel (1949) for the original description of Globotruncana aff. renzi (renamed P. algeriana by Caron, ) "The spire comprises a total number of 16 chambers occupying a little more than two and a half whorls, 6 of them occupying the last whorl. Keels or pustulose ridges border the septa of the spiral side, from the first chambers to the 11th or 12th chamber, the peripheral keel is double. The first of the 6 chambers of the last whorl is still bordered by two keels consisting of small pustules. In the two specimens studied the second chamber of the last whorl is undeveloped (too small for the rank it occupies) and has only one thick keel reminiscent of that of G. stephani Gandolfi; the following four chambers are single keeled, but in the vicinity of the septal suture the carinal ridge splits into two diverging branches, the upper branch forming the septal ridge of the spiral side, the lower branch blurs within the sutural groove of the umbilical side. The last chamber has only a blunt keel, barely noticeable. One sees that in a similar form the axial sections will generally show the typical profile of G. renzi (with a last single-keeled chamber) However, if by chance, the section crosses the point where the keel splits in one of the last chambers, the section will lead us to believe that we are dealing with a fully bicarinate form. The main aperture is not quite visible, however it does not extend much beyond the umbilicus. Fairly developed peristomal tongue-like flaps converge in the umbilical depression, leaving between them small, deep indentations. No accessory apertures."

Entries in the Catalog of original descriptions: Praeglobotruncana algeriana

Geological Range:
Last occurrence (top): within M. schneegansi zone (89.75-92.51Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-98.69Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Praeglobotruncana algeriana, synonyms included - Concavatotruncana algeriana; Dicarinella algeriana; Praeglobotruncana algeriana;
• See also space-time plot :: Samples map :: Parent: Praeglobotruncana

Praeglobotruncana algeriana compiled by the pforams@mikrotax project team viewed: 20-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110426 Go to Archive.is to create a permanent copy of this page - citation notes

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