Pseudoguembelina palpebra

Taxonomy

Original description: "This medium-sized test is composed of 5-8 pairs of chambers which rapidly increase in size in the direction of growth. The pointed initial end consists of as many as 5 pairs of small chambers. In later development the chambers are considerably larger and more inflated. However, in many specimens the ultimate pair of chambers displays strong lateral compression. The pointed initial stage is entire or unlobated in lateral view; the later development is distinctly lobated. The sutures are flush in the early stage, and impressed in the later stage. Surface markings are indistinct or absent in the early stage; later well-developed longitudinal striae parallel the contour of the chambers. In the ultimate pair of chambers these striae are more numerous but somewhat fainter. The principal aperture is a relatively large semilunar opening at the base of the inner margin of the ultimate chamber. It is bordered by a liplike rim. Relatively large accessory apertures are developed in the later stage. Each chamber in the later stage possesses 2 conspicuous accessory apertures, one on each side, directly over the crest of the subjacent chamber. The flaps of the accessory apertures resemble small eyelids. Small papillae form a granular area above the flaps and near the median line."

Entries in the Catalog of original descriptions: Pseudoguembelina palpebra, Pseudoguembelina cornuta, Pseudoguembelina leroyi, Pseudoguembelina polypleura

Geological Range:
Last occurrence (top): at top of P. hariaensis zone (99% up, 66.4Ma, in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of P. palpebra zone (0% up, 71.8Ma, in Maastrichtian stage). Data source: zonal marker (from Timescale Creator)

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: Pseudoguembelina palpebra, synonyms included - Heterohelix palpebra; Pseudoguembelina cornuta; Pseudoguembelina leroyi; Pseudoguembelina palpebra; Pseudoguembelina polypleura;
• See also space-time plot :: Samples map :: Parent: Pseudoguembelina

Pseudoguembelina palpebra compiled by the pforams@mikrotax project team viewed: 29-11-2023 Taxon Search: Advanced Search Short stables page link: https://mikrotax.org/pforams/index.php?id=110455 Go to Archive.is to create a permanent copy of this page - citation notes

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