pforams@mikrotax - Petaloglobigerina simmonsi <title>pforams@mikrotax - Petaloglobigerina simmonsi

Petaloglobigerina simmonsi


Classification: pf_mesozoic -> Conoglobigerinidae -> Petaloglobigerina -> Petaloglobigerina simmonsi
Sister taxa: P. simmonsi

Taxonomy

Citation: Petaloglobigerina simmonsi Gradstein, in Gradstein & Waskowska 2021
Rank: Species
Basionym: Petaloglobigerina simmonsi Gradstein, in Gradstein & Waskowska 2021

Type images:

Original description: Test generally in the 100–150 μm range, trochospiral, low spired. Final whorl large and often almost flat with 3.5–4 petaloide and ovate chambers, rarely finger-like; chamber periphery may become narrow and even pseudo-keeled, but us not imperforate. In larger specimens, individual chambers in the last whorl may slightly twist from the coiling axis; sutures strongly incised; umbilicus narrow or closed; aperture a narrow slit with rim at base of last chamber in umbilical position. A small and incomplete (half) bulla may be rarely present, shielding the aperture. Wall microperforate and densely pustulose, with pustules fusing to form irregular ridges.

Entries in the Catalog of original descriptions: Petaloglobigerina simmonsi


Emended description:


Morphology:

Wall type:

Size:

Geological Range:
Last occurrence (top): within Early Kimmeridgian Substage (154.73-157.25Ma, top in Kimmeridgian stage). Data source: Gradstein & Waskowska 2021
First occurrence (base): within Callovian Stage (163.47-166.07Ma, base in Callovian stage). Data source: Gradstein & Waskowska 2021 (ig 6 - tentative rage extension to Callovian)

Plot of range and occurrence data:

References:

Gradstein, F. & Waskowska, A. (2021). New insights into the taxonomy and evolution of Jurassic planktonic foraminifera. Swiss Journal of Palaeontology. 140(1): 1-12. gs V O

Simmons, M. D., Boudagher-Fadel, M. K., Banner, F. T. & Whittaker, J. E. (1997). The Jurassic Favusellacea, the earliest Globigerina. In, Boudagher-Fadel, M. K., Banner, F. T. & Whittaker, J. E. (eds) The Early Evolutionary History of Planktonic Foraminifera. British Micropalaeontological Society Publication Series . 17-30. gs V O


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Petaloglobigerina simmonsi compiled by the pforams@mikrotax project team viewed: 27-1-2023

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110593 Go to Archive.is to create a permanent copy of this page - citation notes



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