CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina prolata Bolli 1957
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Citation: Globigerina prolata Bolli 1957Rank: SpeciesType 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
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. gsVO
Globigerina prolata compiled by the pforams@mikrotax project teamviewed: 22-3-2023
Bolli1957 pl15 24-26.JPG
holotype illus_819.jpg
Bolli1957 pl15 24-26.JPG
holotype illus_819.jpg
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