CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina rugosa rotundata Bronnimann 1952
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.
Original Description "The large, occasionally subspherical test starts with a low, trochoidal spiral which is followed in the adult by a somewhat higher volution with 5-6 chambers increasing little in size. The chambers of the last whorl are truncate at the apertural side, rounded at the periphery and much elongated in axial direction. The spiral side, with about 2 whorls, is usually slightly depressed. The aperture, as seen in the end chamber, is large, arcuate and opens into the deep and narrow umbilicus. The covering plate seems to be absent. The deep sutures are straight on the umbilical side, and straight to slightly curved on the spiral side. The surface is ornamented by numerous coarse pustules and small ridges arranged in an indistinct meridional pattern. All the investigated specimens are dextrally coiling." Size: The maximum diameter of the paratvpes is from 0.5mm.to 0.55mm.
Holotype:Maximum diameter 0.5mm.End chamber:radial diameter 0.175mm.;tangential diameter 0.275mm.;thickness 0.375mm.
Extra details from original publication Remarks. The rather irregular,occasionally almost subglobular test with the large, axially elongated chambers of the last volution, and the deep and small umbilicus, differentiate this subspecies from other Rugoglobigerinas. In addition, the ornamentation is not so clearly developed in a meridional pattern as observed in typical representatives of the rugosa group. It is believed that R. rugasa rotundata is an offshoot of the rugosa group.
References:
Brönnimann, P. (1952c). Brönnimann, P. (1952). Globigerinidae from the Upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad, B. W. I. Bulletins of American Paleontology. 34(140): 1-70. Bulletins of American Paleontology. 34(140): 1-70. gs
Rugoglobigerina rugosa rotundata compiled by the pforams@mikrotax project teamviewed: 18-7-2025
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Bronnimann 1952 pl4 f7-9.JPG
holotype-241.jpg
Bronnimann 1952 pl4 f7-9.JPG
holotype-241.jpg
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