CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinatheka barri 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 -> Globigerinatheka -> Globigerinatheka barri
Other pages this level: G. barri, G. curryi, G. euganea, G. kutchensis, G. lindiensis, G. subconglobata luterbacheri,

Globigerinatheka barri

Citation: Globigerinatheka barri Bronnimann 1952
Rank: Species
Type locality: Trinidad, B. W. I.
Type age: Upper Eocene
Type sample and level: Mount Moriah formation
Holotype Repository: Washington; USNM
Type & figured specimens: Holotype.- T. L. L. Cat. Nos. 158007, 158028-29, Text figure 3, a, b, c, 75X.

Linked specimens: USNM-3919 USNM-3213

Current identification/main database link: Globigerinatheka barri Bronnimann 1952


Original Description
The test is almost globular and consists of a Globigerina and a supplementary chamber-like growth. About ten Globigerina chambers are arranged in a trochoidal spiral of two whorls (fig. 3f). The end stage of the Globigerina, preceding the supplementary growths, is four-chambered (fig. 3d, f). The subglobular chambers increase rapidly in size as added. Owing to the filling of the chambers with calcite, it was not possible to investigate the apertures of the Globigerina stage, but in analogy to typical Globigerinas, it can be assumed that the apertures are single, large, arcuate openings. The supplementary chamber-like growth consists of a single large and inflated primary 'chamber' across the umbilicus of the Globigerina stage (fig. 3d-f) and three small and rather flattened secondary 'chambers'. The latter come forth from the three openings of the primary 'chamber' (fig. 3a, c, g). The aperture of the adult is multiple . The primary 'chamber' of the supoplementary growth has three semicircular openings at the intersections of the sutures between the three last-formed Globigerina chambers and the primary 'chamber' (fig. 3e). The ontogenic end stage shows nine small semicircular openings situated at the sutural grooves, three of each per secondary chamber-like growth (fig. 3g). The openings appear to have minute lip-like borders. Supplementary growth and Globigerina chambers can be easily separated by the smoother surface, thinner wall, and finer pores of the supplementary 'chambers'.

Size: The maximum diameter of the test, including the supplementary growth, measured in 2 individuals, is 345µm and 365µm.

Etymology: The species is named after K. W. Barr for his contributions to the Geology of Trinidad

Extra details from original publication
The species has been encountered in numerous samples, but is only rarely well preserved.

References:

Brönnimann, P. (1952a). Globigerinoita and Globigerinatheka, new genera from the Tertiary of Trinidad, B.W.I. Contributions from the Cushman Foundation for Foraminiferal Research. 3(1): 25-28. gs :: ::

Premoli Silva, I., Wade, B. S. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Globigerinatheka and Orbulinoides. In, Pearson, P. N. , Olsson, R. K. , Hemleben, C. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 7): 169-212. gs :: ::


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Globigerinatheka barri compiled by the pforams@mikrotax project team viewed: 31-5-2020

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