Catalog - Rugoglobigerina reicheli hexacamerata Catalog - Rugoglobigerina reicheli hexacamerata

CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina reicheli hexacamerata 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.


Higher levels: pf_cat -> R -> Rugoglobigerina -> Rugoglobigerina reicheli hexacamerata
Other pages this level: R. alpina, R. jerseyensis, R. kingi, R. lobatula, R. macrocephala macrocephala, R. macrocephala ornata, R. mexicana, R. milamensis, R. praehelvetica, R. pseudorugosa, R. reicheli hexacamerata, R. reicheli pustulata, R. reicheli reicheli, R. rugosa pennyi, R. rugosa rotundata, R. spinosa, R. tradinghousensis

Rugoglobigerina reicheli hexacamerata

Citation: Rugoglobigerina reicheli hexacamerata Bronnimann 1952
Taxonomic rank: sub-species
Type specimens: 372604 Holotype :T.L.L.Cat.Nos,155591-155594.Plate 2,figs.10-12.
Type age (chronostrat): Maastrichtian
Type locality: Trinidad Leaseholds Ltd. Catalogue nos. 155591-155594, subsurface samples from the Guayaguayare area, southeastern, Trinidad, B.W.I.
Type repository: Washington; USNM

Linked specimens: USNM-372604

Current identification/main database link: Rugoglobigerina hexacamerata Brönnimann, 1952


Original Description

The small to medium-sized test is a low trochoidal spiral with 6 chambers in the adult. The umbilical side, characterized by a very large, deep, almost circular umbilicus, exhibits fragments of the covering plate along the truncate edges of the chambers. The slightly depressed spiral side shows about 2 whorls. The well-separated subglobular and truncate chambers increase rather slowly in size. The end chamber can be smaller than the penultimate one and is frequently displaced toward the umbilical side. The deep sutures are straight and occasionally slightly curved. The arcuate aperture of the end chamber is large and apparently provided with a minute liplike projection. Those of the preceding chambers are not known. The walls are thick, and the surface is coarsely rugose. The surface of about two-thirds of the chambers of the last volution shows the meridional pattern, whereas that of the earlier chambers is irregularly hispid. Only dextrally coiling individuals were counted.

Size:
The maximum diameter of paratypes varies from 0.35mm.to 0.375mm.
Holotype: Maximum diameter 0.375 mm. Diameter of umbilicus O.125mm. End chamber: radial diameter 0.115mm.; tangential diameter O.15mm.; thickness 0.175mm.

Extra details from original publication
The subspecies hexacamerata and pustulata are so closely related that at first they were lumped together. The more detailed investigation proved that the two types can be separated,not only on account of the difference in the number of adult chambers but also by the large, subcircular umbilicus and by the predominant meridional ornamentation in the last whorl of R.reiclieli hexacamerata. From the morphologically similar subspecies pennyi of the rugosa group (0.4-0.425mm.),it is separated by the smaller size and the more delicate ornamentation.

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


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Rugoglobigerina reicheli hexacamerata compiled by the pforams@mikrotax project team viewed: 18-7-2025

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Comments (2)

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Current identification/main database link: Rugoglobigerina hexacamerata (Bronnimann, 1952) [no brackets]

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corrected, thanks