CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana (Rugoglobigerina) beldingi beldingi Gandolfi 1955
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Citation: Globotruncana (Rugoglobigerina) beldingi beldingi Gandolfi 1955Taxonomic rank: sub-speciesType specimens: PI. 1, fig. 8, Text fig. 7, (4a-c) ; 28030: type description p.31Type sample (& lithostrat): Km. 92 section, S. 5587. Type age (chronostrat): Campanian-MaastrichtianType locality: A section near Km. 92 on the Fonseca-Riohacha road, Rancheria Valley, 40 km. north of Fonseca, NE part of the State of Magdalena, northern Colombia.Type repository: Ithaca, New York; Paleontological Research Institution
Original Description Test nearly planispiral becoming somewhat involute on the dorsal side, since the last coil is slightly overlapping the early ones, chambers (five-six in the last whorl) inflated, slightly depressed and slightly overlapping each other in the early stages, increasing in height as added; with central depression as the previous Globotruncana species. A thin lip can be observed extending into the umbilicus and covering the apertures of the last chambers. The test is smooth, somewhat rough in the early stages, dextrally coiling; tubercles, papillae are more frequent along the margin of the shell, where especially in the early chambers they appear in two approximately parallel lines. The last chamber is often subangular with a smooth triangular terminal face. Size: Diynensions of holotype. Width, 0.31 x 0.26 mm.; thickness 0.15 mm. Etymology: named after H. F. Belding of International Petroleum (Colombia), Limited, who collected part of the material studied in this paper. Extra details from original publication Remarks.—Globigerina compressa Plummer of the Midway formation has some umbilical lips but the chambers are more flattened and the umbilicus is narrower. Globigerina voluta (White) differs because of its lobate periphery with outstanding four petaloid chambers, its smaller umbilicus and aperture which, according to the figure of White, is a lineate opening in the middle of the terminal face of the last chamber, whereas in our species it opens into the umbilicus and is covered by a thin lip. Globigerinella messinae messinae Bronnimann shows a more pronounced four-chambered periphery and a marginal aperture provided with a liplike projection extending into the umbilicus. This feature, as well as the similarity of the test, suggests that Globigerinella messinae messinae may derive from Rugoglobigerina beldingi beldingi.
References:
Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia. Bulletins of American Paleontology. 36: 1-118. gs
Globotruncana (Rugoglobigerina) beldingi beldingi compiled by the pforams@mikrotax project teamviewed: 19-5-2026
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holotype illus-496.jpg/Globotruncana (Rugoglobigerina) beldingi beldingi/holotype illus-496.jpg)
holotype illus-496.jpg
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