Catalog - Biglobigerinella barri Catalog - Biglobigerinella barri

CATALOG OF ORIGINAL DESCRIPTIONS: Biglobigerinella barri Bolli, Loeblich and Tappan 1957

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 -> B -> Biglobigerinella -> Biglobigerinella barri
Other pages this level: B. algeriana, B. barri, B. kerisensis, B. multispina, B. pulchra, B. sigali

Biglobigerinella barri

Citation: Biglobigerinella barri Bolli, Loeblich and Tappan 1957
taxonomic rank: Species
Type specimens: Holotype :(USNM P4543), Paratypes figured (USNM P4544a-e) and unfigured paratypes (USNM P4545)
Type age (chronostrat): Aptian
Type locality: Types and occurrence: Holotype (USNM P4543), figured paratypes (USNM P4544a-e) and unfigured paratypes (USNM P4545) from the Lower Cretaceous (Aptian) Maridale formation, Maridale Estate, east Central Range, Trinidad, B. W. I. Collected by H. H. Renz. Maridale Estate, eastern Central Range, Trinidad
Type repository: Washington; USNM

Linked specimens: USNM-4545 USNM-4544 USNM-4544 USNM-4544 USNM-4544 USNM-4544 USNM-4543

Current identification/main database link: Globigerinelloides barri (Bolli, Loeblich and Tappan, 1957)

Original Description

Test free, planispiral, biumbilicate, nearly involute to evolute; peripheral margin somewhat lobulate; chambers ovate to nearly spherical, 8-10 in the final planispiral whorl; in some specimen a smaller low but broad final chamber may cover a double-apertured penultimate chamber or there may be a small chamber at each side of the periphery, each covering one of the lateral apertures of the penultimate chamber; sutures distinct, depressed, radial in the early portion, becoming signoid in the later stages; wall calcareous, finely perforate, surface distinctly rugose I the early portion, later chambers nearly smooth or pitted; aperture interiomarginal, in the early stage equatorial, a low arch bordered above with a narrow lip, in the later stge there is a double aperture consisting of a small extraumbilical arch at each side of the last chamber, or one to each of the final paired chambers which may extend almost into the umbilicus, each aperture bordered by a lip.

Greatest diameter of holotype 0.49 mm., thickness across paired chambers 0.36 mm. Paratypes range from 0.39 to 0.62 mm. in diameter.

The specific name is given in honor of Dr. K. W. Barr, in recognition of his work on the geology of Trinidad.

Extra details from original publication

Remarks: Biglobigerinella barri, new species, differs from B. multispina Lalicker in being larger and more compressed and in having 8 to 10 chambers per whorl instead of only 5 to 6. The chambers are also more nearly globular in B. multispina.

The shape and number of the chambers is also similar to Globigerinelloides algeriana Cushman and ten Dam, from which the present species differs only in developing a double aperture and finally the double-chambered end stage. This species strongly suggests that Biglobigerinella may have arisen from the Aptian genus Globigerinelloides.


Bolli, H. M., Loeblich, A. R. & Tappan, H. (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 3-50. gs


Biglobigerinella barri compiled by the pforams@mikrotax project team viewed: 22-2-2024

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