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Conoglobigerina jurassica


Classification: pf_mesozoic -> Conoglobigerinidae -> Conoglobigerina -> Conoglobigerina jurassica
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 jurassica (Gofman, 1958)
Rank: Species
Basionym: Globigerina jurassica
Taxonomic discussion: The most characteristic feature of this species is the glomerate coiling of the chambers. From Globigerina hauterivica Subbotina our form differs by its more glomerate coiling and higher test. The species is close to the form described by Balakhmatova (1953, Leningrad: Vses. Nauchno-Issled. Geol. Inst. (VSEGEI), Trudy, Pal. Strat., Sbornik Statey) as Globigerina sp. [copied from Chronos database]

Type images:

Original description: Globigerina jurassica Gofman 1958: Translation from the Russian - Test small, high, consists of three whorls, coiled subglomerately. Test formed by 10-11 chambers, spherical, unevenly increasting in size as added. Last whorl consists of 3-4 chambers of nearly uniform size, tightly appressed. Intercameral sutures nearly straight, weakly depressed. Aperture umbilical, in the form of an elongated slit, slightly visible at the last chamber.

Entries in the Catalog of original descriptions: Globigerina jurassica;

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:Highchamber arrangement:Trochospiralumbilicus:Wide
edge view:Spiroconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Finely pustuloseaperture:Umbilicalaperture border:N/Aaccessory apertures:N/A
periphery:N/Aumb chamber shape:Globularsp chbr shape:Globularperiph margin shape:Broadly rounded
umb depth:Shallowdiameter mm:0.12width mm:0.08breadth mm:0.1
final-whorl chambers:3.0-4.0

References:

Gofman, E.A., (1958). New finds of Jurassic Globigerina. Verhandelingen der Koninklijke Nederlandse Akademie van Wetenschappen, AFD. Natuurkunde, 1959(2): 125-126.


Conoglobigerina jurassica compiled by the pforams@mikrotax project team viewed: 23-5-2017

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