Catalog - Rugoglobigerina macrocephala ornata Catalog - Rugoglobigerina macrocephala ornata

CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina macrocephala ornata 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 macrocephala ornata
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 macrocephala ornata

Citation: Rugoglobigerina macrocephala ornata Bronnimann 1952
Taxonomic rank: sub-species
Type specimens: 371325 T.L.L.Cat.Nos.155591-155594-Plate 2, figs. 4-6.
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-371325

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


Original Description

The relatively large trochoidal test is, as a rule, four-chambered in the adult. The deep and small umbilicus is invariably filled with matrix, and only remains of the covering plate were observed. The slightly depressed spiral side exhibits about two whorls. The truncate and peripherally rounded chambers increase rapidly in size. The en chamber occasionally is smaller than the penultimate one (compare the descriptions of Rugoglobigerina (Rugoglobigerina) reicheli Bronnimann subspp. reicheli, pustulata and hexacamerata Bronnimann. The sutures between the chambers of the adult are deep and straight, those of the initial portion indistinct. The large, semicircular aperture of the end chamber is provided with minute lip-like borders and opens into the umbilicus. The walls are thick. The irregular arrangement of the rugosities is confined to the innermost chambers. The four last chambers show in general the meridional pattern. The specimens are invariably dextrally coiling.

Size:
The maximum diameter of paratypes measures from 0.325mm.to 0.4mm. Holotype:Maximum diameter 0.35mm.End chambers: radial diameter 0.15mm.; tangential diameter 0.25mm;thickness 0.225mm.

Extra details from original publication
Remarks: The subspecies ornata is similar to macrocephala, but rather constant differences in size and development of the meridional pattern justify separate subspecies. The test of ornata is larger than that of macrocephala, and in addition shows a more pronounced meridional pattern in the adult. It occupies an intermediate position between the macrocephala and the rugosa groups.

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 macrocephala ornata compiled by the pforams@mikrotax project team viewed: 18-7-2025

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