CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina prolata Bolli 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 -> G -> Globigerina -> Globigerina prolata
Other pages this level: << < G. planoexilis, G. polusi, G. portsdownensis, G. postcretacea, G. posttriloculinoides, G. posttriloculinoides clinata, G. praebulloides, G. praebulloides leroyi, G. praebulloides occlusa, G. praebulloides pseudociperoensis, G. praebulloides pseudoleroyi, G. praebulloides tinguarensis, G. praedigitata, G. praeglobotruncanaeformis, G. prasaepis, G. prolata, G. prolonga, G. protoreticulata, G. pseudoampliapertura, G. pseudobulloides, G. pseudocorpulenta, G. pseudocretacea, G. pseudodruryi, G. pseudoedita, G. pseudoeocaena, G. pseudoeocaena compacta, G. pseudoeocaena ellipsocamera, G. pseudoeocaena perfida, G. pseudoeocaena pseudoeocaena, G. pseudoeocaena trilobata, G. pseudoiota> >>

Globigerina prolata

Citation: Globigerina prolata Bolli 1957
Rank: Species
Type specimens: Holotype: (USNM P5040) from Ravine Ampelu, Lizard Springs area, about 1 1/4 mile southeast of the road junction of the Rio Claro-Guayaguayare Road (8 3/4 M.P.) and the old Trinidad Central Oilfields Road leading to the abandoned Lizard Springs oilfield, southeast Trinidad (coordinates N: 186505 links;E: 556755 links), sample Rz. 281 (TLL 50314).
Type repository: Washington; USNM

Linked specimens: USNM-5040

Current identification/main database link: Alicantina prolata (Bolli 1957)


Original Description
Shape of thest low, trochospiral, biconvex. The equatorial periphery elongate, distinctly lobate. Axial periphery rounded. Wall calcareous, perforate, surface smooth. Chambers inflated globular to slightly compressed, about tweleve, arranged in two and one-half whorls, the four or five chambers in the last whorl increasing rapidly in size. Sutures on spiral side radial or slightly oblique, depressed; on umbilical side radial, depressed. Umbilicus fairly wide, open. Apertures distinct arches, interiomarginal, umbilical; in some specimens the aperture of the last chamber tends to become extraumbilical-umbilica in position. Coiling in two-thirds of the specimens counted in the Globorotalia aragonensis zone sinistral.

Size: Largest diameter of holotype 0.40 mm.

Extra details from original publication
Remarks: Globigerina prolata Bolli, new species, probably branched off from G. collactea Finlay in the Globorotalia rex zone. It became fairly common in the Globorotalia formosa formosa and Globorotalia aragonensis zones. Bronnimann (1952) figured and described this
species as Globigerina pseudobulloides Plummer. Because of the interiomarginal, extraumbilical-umbilical position of its apertures, pseudobulloides is now placed in Globorotalia. Globigerina prolata differs from Globorotalia pseudobulloides in the umbilical position of the
apertures, absence of a flaring lip in the last chamber, and more trochospiral arrangement of the chambers.
Also it has a distinctly different stratigraphic range. Globorotalia pseudobulloides is restricted to the Paleocene (Globorotalia trinidadensis to the Globorotalia pusilla pusilla zones) and Globigerina prolata to the lower Eocene (Globorotalia rex to the Globorotalia aragonensis zones).

References:

Bolli, H. M. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. 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: 61-82. gs V O


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Globigerina prolata compiled by the pforams@mikrotax project team viewed: 23-7-2021

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