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Conoglobigerina terquemi


Classification: pf_mesozoic -> Conoglobigerinidae -> Conoglobigerina -> Conoglobigerina terquemi
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 terquemi (Iovceva & Trifonova, 1961)
Rank: Species
Basionym: Globigerina terquemi

Type images:

Original description: Globigerina terquemi Iovceva & Trifonova 1961: The test is small; very low trochoid, almost flat. The spiral makes two whorls, having four chambers to each whorl. The first chambers are hardly noticeable, while the following ones increase uniformly in size. Every two opposite chambers are situated perpendicularly to each other. The sutures are straight, strongly depressed. The aperture is small, umbilical, extending in the last four chambers. Specimens are also observed with closely fitting chambers, as well as specimens in which on the four chambers of the last whorl a supplementary chamber is present. There are very slight variations in the dimensions of individual specimens.

Entries in the Catalog of original descriptions: Globigerina terquemi;

Geological Range:
Last occurrence (top): within Tithonian Stage (145.01-152.06Ma, top in Tithonian stage). Data source: [copied from Chronos database]
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian 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:Moderatechamber arrangement:Trochospiralumbilicus:Wide
edge view:Planoconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:
wall texture:aperture:Umbilicalaperture border:Thin porticusaccessory apertures:N/A
periphery:N/Aumb chamber shape:Globularsp chbr shape:Globularperiph margin shape:Broadly rounded
umb depth:Shallowdiameter mm:0.4width mm:breadth mm:0.14
final-whorl chambers:4.0-4.0

References:

Iovceva, P. & Trifonova, E., (1961). Tithonian Globigerina from northwestern Bulgaria. Bulgar Akad Nauk Geol Inst, Paleont., 3: 343-347.


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

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