Catalog - Globigerina wilsoni bolivariana Catalog - Globigerina wilsoni bolivariana

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina wilsoni subsp. bolivariana Petters 1954

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 wilsoni bolivariana
Other pages this level: << < G. tuschepsensis, G. umbilicata, G. umbrica, G. uruchaensis, G. utilisindex, G. varianta, G. velascoensis, G. velascoensis compressa, G. venezuelana, G. vignalii, G. voluta, G. wagneri, G. washitensis, G. weissi, G. wilsoni, G. wilsoni bolivariana, G. winkleri, G. woodi, G. woodi connecta, G. woodi extrema, G. yeguaensis, G. yeguaensis pseudovenezuelana, G. zealandica, G. neoparawoodi

Globigerina wilsoni bolivariana

Citation: Globigerina wilsoni subsp. bolivariana Petters 1954
taxonomic rank: sub-species
Described on page(s) : 39-40
Type specimens: Plate 8, figures 9a,b, c
Type sample (& lithostrat): Upper Carreto formation. Blue grey sandy shale.
Type age (chronostrat): Asterigerina crassaformis zone, Middle Eocene
Type locality: International Petrol. Co. (Colombia) locality No. 22,660-A. 2230 m. WNW. of Carreto on road to San Cayetano in a 50° SE. dipping limb of a small syncline. Departamento of Bolivar.
Type repository: Washington; USNM

Linked specimens: USNM-689637

Current identification/main database link: Pseudoglobigerinella bolivariana (Petters 1954)


Original Description

Test globular, almost planispirally coiled, completely involute on ventral, nearly so on dorsal side, which, at most, shows the proloculus uncovered but with never a trace of the penultimate whorl; umbilicus only slightly more depressed on ventral than on dorsal side, giving an almost equally rounded aspect to both sides. Four, more rarely five, globular chambers in last-formed coil, increasing fairly rapidly in size except for oldest chamber, which, in a few specimens, is smaller than the penultimate one. Wall finely perorate. Aperture a narrow slit at base of last-formed chamber, extending more on ventral than on dorsal side. 

Size:
Greatest diameter 0.58 mm.; least diameter 0.53 mm.; thickness 0.48 mm.

Etymology:
The name of the subspecies is derived from the Departamento of Bolivar.

Extra details from original publication
The subspecies is almost identical with the Mexican Eocene Globigerina wilsoni Cole, especially to those figures of Stainforth (1948). The only difference is on the dorsal side where Cole (1927, plate 4, figure 8) and Stainforth (1948, plate 26, figure 2) show a small portion of the earlier whorls visible, in contrast to which the subspecies is almost completely involute. Another difference is that this new subspecies is larger than Cole's species. Cole (1927, p. 34) emphasizes the small size of the Mexican types (the figured type specimen measures 0.25 mm.), and Stainforth figures (1948, plate 26, figure 1) a specimen of about 0.4 mm. against an average of 0.6 to 1 mm. of the subspecies. Specimens corresponding in size and degree of dorsal involution with Stainforth's G. wilsoni (?) Cole (figures 1-3, plate 26) occur from the late Middle Eocene to the earliest Oligocene in Colombia, whereas the sub-species is common in the Middle Eocene and has so far never been found in younger beds.

References:

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. 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 5): 67-110. gs O

Petters, V. (1954). Tertiary and Upper Cretaceous foraminifera from Colombia, S. A. Contributions from the Cushman Foundation for Foraminiferal Research. 5(1): 37-41. gs


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Globigerina wilsoni bolivariana compiled by the pforams@mikrotax project team viewed: 22-2-2024

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