CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana marginata austinensis Gandolfi 1955
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Citation: Globotruncana marginata austinensis Gandolfi 1955Taxonomic rank: sub-speciesType specimens: PI. 1, fig. 6; 20828: type description p.29Type sample (& lithostrat): Km. 92 section, S. 5604. 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 Under Globotruncana marginata austinensis in E+M online catalogue
"Flat form or slightly convex on both sides, double keeled. Keels close to each other, hambers (5 in last whorl) inflated on both sides, slightly overlapping and rapidly increasing as added. Due to the increasing inflation of ht achmabers, the dorsal sid eof the test is depressed in the central part. The sutures are continuously raised in the last chambers, being finely beaded in the continuously raised in the last chambers, beign finley beaded in the early ones. On the ventral side in the sutures are generally slightly curved and raised in the adult stages, radial and depressed in the early stages, with the sutural elevations disappearing in the umbilical sutural depressions (only an umbilical thickening remains). The test is rougher and somewhat spinose in the early stage, dextrally coiling." Size: Dimensions of holotype.Width 0.38 x 0.32 mm.; thickness, 0.16 mm. Extra details from original publication Remarks.—The form is closely related to Glt. marginata (Reuss) of the Planemergel (Cushman, 1946, pi. 62, fig. la-c) which has been considered by the author as identical to the Austin species. However, a comparision of both figures shows a difference in the shape and growth of the chambers, whereas in regard to other morphological characteristics the two are apparently identical. The difference cannot be interpreted as deriving from an eventual sexual dimorphism since both specimens illustrated by Cushman are apparently megalospheric forms. The variability of the species cannot be inferred because all our specimens are more or less related
to the species of the Austin chalk, and none can be compared to the European species.
References:
Gandolfi, R. (1955). Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia. Bulletins of American Paleontology. 36: 1-118. Bulletins of American Paleontology. 36: 1-118. gs
Globotruncana marginata austinensis compiled by the pforams@mikrotax project teamviewed: 23-6-2025
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