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Globuligerina avariformis


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

Taxonomy

Citation: Globuligerina avariformis (Kasimova in Kasimova & Aliyeva, 1984)
Rank: Species
Basionym: Conoglobigerina avariformis Kasimova in Kasimova & Aliyeva, 1984
Taxonomic discussion: Placement of this species in Conoglobigerina follows Gradstein (2017)

Type images:

Original description: Test medium-sized, highly conical, trochospiral, length exceeds diameter. Coil consists of 3.5-4 whorls. First two whorls many-chambered with 5-6 small, spherical chambers of nearly uniform size, following ones have 3-4 chambers per whorl. Chambers spherical, subspherical in outline, rapidly increase in dimensions, somewhat compressed laterally. Proloculus small, spherical to oval in outline. No uniformity is seen in chamber shape. Sutures depressed, thin. Aperture umbilical, small, arcuate. Surface matte, tuberculate.

Entries in the Catalog of original descriptions: Conoglobigerina avariformis

Geological Range:
Last occurrence (top): within Early Oxfordian Substage (160.84-163.47Ma, top in Oxfordian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Bajocian Stage (168.28-170.30Ma, base in Bajocian 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:Inflatedcoiling axis:Highperiphery:N/Aaperture border:N/A
    umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
    spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1┬Ám
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.0-4.0 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 :: ::

    Kasimova, G. K. & Aliyeva, D. G. (1984). Planktonic foraminifera of the Middle Jurassic deposits of Azerbaidzhan. In, Alizade, K. A. (ed.) Questions in the paleontology and stratigraphy of Azerbaidzhan. Elm (for Akad Nauk Azerbaidzhan. SSR, Inst Geol im I.M. Gubkinaa), Baku 1-12. gs :: ::


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    Globuligerina avariformis compiled by the pforams@mikrotax project team viewed: 7-6-2020

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110200 Go to Archive.is to create a permanent copy of this page - citation notes



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