pforams@mikrotax - Globuligerina avariformis

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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.

Gradstein 2017 f8 08-10.JPG

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:

holotype: C. avariformis

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 range and occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Globuligerina

Character matrix

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Spiroconvex	aperture:	Umbilical
sp chamber shape:	Inflated	coiling axis:	High	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Inflated	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Shallow	wall texture:	Finely pustulose	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Moderately depressed	final-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 V O

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: 24-1-2021

Taxon Search:

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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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