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Conoglobigerina avariformis


Classification: pf_mesozoic -> Conoglobigerinidae -> Conoglobigerina -> Conoglobigerina avariformis
Sister taxa: C. avarica, C. avariformis, C. balakhmatovae, C. caucasica, C. conica, C. dagestanica, C. gulekhensis, C. jurassica, C. meganomica, C. terquemi,

Taxonomy

Citation: Conoglobigerina avariformis Kasimova in Kasimova & Aliyeva, 1984
Rank: Species
Basionym: Conoglobigerina avariformis

Type images:

Original description: Conoglobigerina avariformis Kasimova 1984: 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 Bajocian Stage (168.28-170.30Ma, top in Bajocian stage). Data source: [copied from Chronos database]
First occurrence (base): within Bajocian Stage (168.28-170.30Ma, base in Bajocian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Lobatecoiling axis:Highchamber arrangement:Trochospiralumbilicus:Wide
edge view:Spiroconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Microperforate: <1
wall texture:Finely pustuloseaperture:Umbilicalaperture border:N/Aaccessory apertures:N/A
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Broadly rounded
umb depth:Shallowdiameter mm:0.13 - 0.29width mm:0.11 - 0.27breadth mm:0.15 - 0.31
final-whorl chambers:3.0-4.0

References:

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


Conoglobigerina avariformis compiled by the pforams@mikrotax project team viewed: 29-5-2017

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