CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina rugosa pennyi 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 test is of intermediate size.The chambers are arranged in a low trochoidal spire of about 2 whorls. The spiral side is slightly depressed. The las volution comprises 6-7 chambers which do not, or only very slowly, increase in size. The chambers are truncate on the apertural side and rounded peripherally. The subcircular umbilicus is large and deep, and covered with a frail plate, usually preserved only in fragments along the apertural edges. The large, arcuate apertures open into the umbilicus and seem to be provided with minute lip-like borders. The surface shows strong rugosities which in the last volution are arranged in the meridional pattern. Size: The maximum diameter of the paratypes ranges from 0.4mm.to 0.425mm.
Holotype: Maximum diameter 0.4mm.Diameter of umbilicus 0.15mm. End chamber: radial diameter 0.125mm.;tangential diameter 0.175mm.; thickness 0.125 mm.
Etymology: It is named for F.W. Penny who extensively developed the use of Foraminifera in correlation and in mapping the marine Tertiary clays of the southern part of Trinidad in the early Twenties. Extra details from original publication This subspecies is related to the 4 to 6-chambered rugosa, but can be separated on account of the smaller average size (0.4-0.425mm,against 0.4-0.57mm.),the 6 to 7 chambers of the last volution,their less marked increase in size, and the much larger umbilicus
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 pennyi compiled by the pforams@mikrotax project teamviewed: 8-7-2025
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Bronnimann 1952 pl4 f1-3.JPG
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Bronnimann 1952 pl4 f1-3.JPG
holotype-239.jpg
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