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Conoglobigerina grigelisi


Classification: pf_mesozoic -> Conoglobigerinidae -> Conoglobigerina -> Conoglobigerina grigelisi
Sister taxa: C. caucasica, C. grigelisi, C. gulekhensis, C. helvetojurassica, C. sp.,

Taxonomy

Citation: Conoglobigerina grigelisi Gradstein 2017
Rank: Species

Type images:

Original description: Low to medium high conical test with a compact spire and 3.5–4 chambers in the last whorl. H/D ratio 0.5–1, rarely over 1. No preferred coiling direction observed. The chambers of the last whorl are large and have deeply incised sutures. Last whorl strongly embraces previous (? 2) whorls such that the earlier part of the test maybe hardly visible. Apex generally blunt, rarely pointed. Umbilical area depressed. Aperture generally a more or less symmetrical arch with lip, rarely comma-shaped. Specimens may have a small bulla over the umbilicus with one or two, low-arch apertures; it may resemble the bulla structure of Cenozoic Catapsydrax taxa. Wall microperforate, strongly pustulose; pustules form low and broken ridges that create an imperfectly reticulate pattern over the surface of the chambers.

Entries in the Catalog of original descriptions: Conoglobigerina grigelisi

Distinguishing features:

Low to medium high conical test with a compact spire and 3.5 to 4 chambers in the last whorl. H/D ratio 0.5 to 1, and rarely over 1. No preferred coiling direction observed. The chambers of the last whorl are large and have deeply incised sutures. Last whorl strongly embraces previous (? 2) whorls such that the earlier part of the test may hardly be visible. Apex generally blunt, rarely pointed. Umbilical area depressed. Aperture generally a more or less symmetrical arch with lip, rarely comma-shaped. Specimens may have a small bulla over the umbilicus with one or two, low-arch apertures; it may resemble the bulla structure of Cenozoic Catapsydrax taxa. Wall microperforate, strongly pustulose; pustules form low and broken ridges that create an imperfectly reticulate pattern over the surface of the chambers.


Wall type: Microperforate, strongly pustulose; pustules form low and broken ridges which create an imperfectly reticulate pattern

Test morphology: Low to medium high conical test with a compact spire

Size: up to 150 micron

Most likely ancestor: Globuligerina avariformis - at confidence level 2 (out of 5). Data source: Gradstein et al. (2017) p. 263.

Geological Range:
Last occurrence (top): within Early Kimmeridgian Substage (154.73-157.25Ma, top in Kimmeridgian stage). Data source: Gradstein et al. 2017
First occurrence (base): at base of Middle Oxfordian Substage (0% up, 160.8Ma, in Oxfordian stage). Data source: Gradstein et al. 2017

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Conoglobigerina

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
    sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:N/A
    umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
    spiral sutures:Strongly depressedumb depth:Deepwall texture:Moderately pustuloseshell porosity:-
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.5-4.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Gradstein, F. M. (2017a). New and emended species of Jurassic planktonic foraminifera. Swiss Journal of Palaeontology. 136(2): 161-185. gs

    Gradstein, F. M., Gale, A. S., Kopaevich, L., Waskowska, A., Grigelis, A. & Glinskikh, L. (2017a). The planktonic foraminifera of the Jurassic. Part I: material and taxonomy. Swiss Journal of Palaeontology. 136(2): 187-257. gs


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    Conoglobigerina grigelisi compiled by the pforams@mikrotax project team viewed: 22-10-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110585 Go to Archive.is to create a permanent copy of this page - citation notes



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