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Globuligerina tojeiraensis


Classification: pf_mesozoic -> Conoglobigerinidae -> Globuligerina -> Globuligerina tojeiraensis
Sister taxa: G. avariformis, G. balakhmatovae, G. bathoniana, G. dagestanica, G. jurassica, G. oxfordiana, G. oxfordiana calloviensis, G. tojeiraensis, G. sp.,

Taxonomy

Citation: Globuligerina tojeiraensis Gradstein 2017
Rank: Species

Type images:

Original description: Relatively low to medium high trochospiral, with an H/D ratio of 0.3–05, rarely larger. Test consists of 2–3 whorls with a tiny initial chamber (where visible). No preferred coiling direction observed. Last whorl with four chambers, which strongly increase in width, flaring out. Chambers are rounded with deeply incised sutures; chambers in the last whorl often radially elongate and higher than broad; last chamber often pointing slightly left or right in the equatorial plane. The test has a sunk-in umbilical region; umbilicus small to large (wide open). G. tojeiraensis has this peculiar knack (depressed umbilicus) with surrounding chambers often sticking up two by two. The chambers 2 and 4 of the last whorl stick more up than chambers 1 and 3.
Aperture a low to rarely high arch; it may be slightly asymmetrical in shape, as shown on Fig. 12.5a; aperture generally umbilical in position, rarely umbilical—extraumbilical. A small bulla occurs rarely; it obscures the aperture of the final chamber. Wall pustulose; pustules may fuse to form broken ridges.

Entries in the Catalog of original descriptions: Globuligerina tojeiraensis

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

Geological Range:
Last occurrence (top): within Early Tithonian Substage (147.72-152.06Ma, top in Tithonian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Callovian Stage (163.47-166.07Ma, base in Callovian 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: Globuligerina

    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:Elongateumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1┬Ám
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.0-4.0 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


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    Globuligerina tojeiraensis compiled by the pforams@mikrotax project team viewed: 22-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110584 Go to Archive.is to create a permanent copy of this page - citation notes



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