Catalog - Globigerinella messinae subcarinata Catalog - Globigerinella messinae subcarinata

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinella messinae subcarinata Bronnimann 1952

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globigerinella -> Globigerinella messinae subcarinata
Other pages this level: G. aberranta, G. aissana, G. alexi, G. biforaminata, G. cushmani, G. duboisi, G. escheri clavata, G. evoluta, G. evoluta evoluta, G. gottisi, G. japonica, G. liverovskae, G. megaperta, G. messinae messinae, G. messinae subcarinata, G. naguewichiensis, G. praemicra, G. pseudovoluta, G. roeglina, G. subangulata, G. tururensis, G. ultramicra, G. voluta pinguis

Globigerinella messinae subcarinata

Citation: Globigerinella messinae subcarinata Bronnimann 1952
Taxonomic rank: sub-species
Type specimens: 370091 Holotype:T.L.L.Cat.Nos.155591-155594.Text figs.21a,b.All appr.X 80.Plate 1,figs.10,11.
Type sample (& lithostrat): upper Guayaguayare Fm.
Type age (chronostrat): Maastrichtian, Abathomphalus mayaroensis Zone
Type locality: Trinidad Leasehold Ltd. Catalogue nos. 155591-155594, subsurface samples from the Guayaguayare area, southeastern Trinidad, BWI.
Type repository: Washington; USNM

Linked specimens: USNM-370091

Current identification/main database link: Planohedbergella subcarinata (Bronnimann, 1952)


Original Description

The small, compressed and planispiral test has a lobate outline. The adult volution is composed of 5, rarely 6, much-compressed, subcarinate chambers. The last whorl is semi-involute, exposing in the shallow umbilici parts of the earlier chambers. The chambers are separated by rather deep and straight sutures. The end chamber is occasionally not larger or even smaller than the penultimate one. The outline of the individual chambers is elongate-ellipsoid in apertural and subcircular in lateral view. Early ontogenetic chambers are rounded peripherally, similar to those of the subspecies Globigerinella messinae subsp. messinae Bronnimann. The large arcuate aperture is situated equatorially at the base of the end chamber and is provided with a delicate, indistinct lip-like projection. The walls appear to be thin and finely perforate. Minute papillae are evenly distributed over the surface. The ornamentation is stronger in the early stage of the last volution."

Size:
The maximum diameter of the paratypes varies from 0.3mm.to 0.4mm. Holotype:Maximum diameter 0.35 mm.End chamber:radial diameter 0.15mm.; tangential diameter 0.15mm.;thickness 0.10mm

Extra details from original publication
Remarks. The subspecies subcarinata is closely related to messinae and transitional forms are difficult to assign. Most of the tests however can be classified without difficulty. As a rule, subcarinata is more compressed,coarser ornamented and stronger  evolute than the non-carinate central type. In addition the liplike projection is better developed in messinae than in subcarinata. Early ontogenetic stages of the 2 subspecies are almost identical.

Occurrence: Globotruncana mayaroensis zone. Rather scarce.

References:

Brönnimann, P. (1952c). Globigerinidae from the Upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad, B. W. I. Bulletins of American Paleontology. 34(140): 1-70. gs


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Globigerinella messinae subcarinata compiled by the pforams@mikrotax project team viewed: 19-11-2025

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