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Conoglobigerina meganomica


Classification: pf_mesozoic -> Conoglobigerinidae -> Conoglobigerina -> Conoglobigerina meganomica
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 meganomica (Kuznetsova in Kuznetsova & Uspenskaya, 1980)
Rank: Species
Basionym: Globuligerina meganomica
Similar species: Translated from Russian: Differs from G. calloviensis Kuznetsova by shape and contour of higher trochospiral test, less compact chambers in the last whorl, and by larger inner whorl. The same features make this species different from G. gulekhensis Gorbachik and Poroshina and G caucasica Gorbachik and Poroshina Differs from G. terquemi (Iovceva and Trifonova) by fewer chambers in an inner whorl, smaller last chamber, and by narrower aperture. Similar species was described as Globigerina sp. and its image (spiral side) was given, that might belong to Globuligerina. [copied from Chronos database]

Type images:

Original description: Globuligerina meganomica Kuznetsova in Kuznetsova & Uspenskaya 1980: Translated from Russian: Test small, trochospiral, consists of two whorls. 4 chambers in an inner whorl, 3-4 chambers in the last whorl. The chambers are closely packed in an inner whorl, and become less compact in the last whorl. Periphery widely rounded. Contour lobate. Sutures slightly depressed and slightly curved. Aperture umbilical with thin lip. Test calcareous, finely porous. Pores are of two types: small and dense (0.4 - 1 microns) and large up to 5 microns. Surface covered with pustules and cells. Cells are irregular and spread everywhere. Holotype measures: D1 0.19 mm, D2 0.14 mm, H 0.1 mm, compressing index D1 : H 1.9. Varies in compression index (2.0 ÃÉ¢ÃÇÂÄÃÇÂì 1.7), in size of an inner whorl which is usually not more that 1/3 D1, although sometimes it reaches to a half of D1, and in having additional small chambers (1-2) on the umbilical sides of some specimens, covering an aperture and umbilicus.

Entries in the Catalog of original descriptions: Globuligerina meganomica;

Geological Range:
Last occurrence (top): within Callovian Stage (163.47-166.07Ma, top in Callovian stage). Data source: [copied from Chronos database]
First occurrence (base): within Callovian Stage (163.47-166.07Ma, base in Callovian 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:Low-moderatechamber arrangement:Trochospiralumbilicus:Wide
edge view:Planoconvexumbilical or test sutures:Strongly depressedspiral sutures:Strongly depressedshell porosity:
wall texture:Moderately muricateaperture:Umbilicalaperture border:N/Aaccessory apertures:N/A
periphery:N/Aumb chamber shape:Globularsp chbr shape:Globularperiph margin shape:Broadly rounded
umb depth:Shallowdiameter mm:0.21width mm:0.17breadth mm:0.1
final-whorl chambers:4.0-4.0

References:

Kuznetsova, K.I. & Uspenskaya, E.A., (1980). Novie nakhodki planktonnikh foraminifer v verkhneyurskikh otlozhenii Krima. Doklady Akademii Nauk SSSR, 259(3): 748-751.


Conoglobigerina meganomica compiled by the pforams@mikrotax project team viewed: 26-6-2017

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