pforams@mikrotax - Globuligerina avariformis pforams@mikrotax - Globuligerina avariformis

Globuligerina avariformis

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


Citation: Globuligerina avariformis (Kasimova in Kasimova & Aliyeva, 1984)
taxonomic 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

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: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:3-4 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within Early Oxfordian Substage (159.40-161.50Ma, top in Oxfordian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Bajocian Stage (168.17-170.90Ma, base in Bajocian stage). Data source: Gradstein et al. 2017

Plot of range and occurrence data:


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


Globuligerina avariformis compiled by the pforams@mikrotax project team viewed: 24-7-2024

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