CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana gansseri Bolli 1951
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Citation: Globotruncana gansseri Bolli 1951Taxonomic rank: speciesType specimens: 59687Type age (chronostrat): MaastrichtianType locality: Subsurface section in the Brighton area, near Pitch Lake, southwestern Trinidad. Found also in an outcrop in the river bed south of the bridge near mile post 12.5 on the Guaracara-Tabaquite Road, Lantern Estate, Central Range, Trinidad;Type repository: Washington; USNM
Original Description "Test flat on dorsal side, ventrally strongly inflated. The chambers of the last whorl, usually five in number, surround a deep umbilicus. The suture lines on the dorsal side are curved and in many cases finely beaded. A distinct marginal keep separates the flat dorsal part from the inflated ventral side. Suture lines of the ventral side are slightly curved, indicating a slight overlapping of chambers. The wall, and particularly the ventral part of it, is somewhat rough or spiny." Size: diameter, 0.53 mm.; thickness, 0.27mm Extra details from original publication The morphological habitus of G. gansseri seems in many ways closely related to G. helvetica from the Upper Cretaceous of Switzerland (Bolli, 1944, pp. 226-227, fig. 1, no. 9 to no. 12, pl. 9, figs. 6-8). G. gansseri appears to be less lobate, however, has fewer chambers, and the initial portion does not rise above the final chambers on the dorsal side as often occurs in G. helvetica. The latter species also has a very short life range, but occurs at the Cenomanian-Turonian boundary and is thus definitely older than G. gansseri. It probably originated from a Globigerina-like form, and the same has to be assumed for Globotruncana gansseri since no transitions between this characteristic species and others have been observed
References:
Bolli, H. M. (1951b). The genus Globotruncana in Trinidad. Journal of Paleontology. 25(2): 187-199. gs
Globotruncana gansseri compiled by the pforams@mikrotax project teamviewed: 30-4-2025
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Bolli 51 pl35 f1-3.JPG
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Bolli 51 pl35 f1-3.JPG
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