CATALOG OF ORIGINAL DESCRIPTIONS: Truncorotaloides rohri var. mayoensis Bronnimann & Bermudez 1953

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 -> T -> Truncorotaloides -> Truncorotaloides rohri mayoensis
Other pages this level: T. haynesi, T. libyaensis, T. rohri, T. rohri guaracaraensis, T. rohri mayoensis, T. rohri piparoensis

Truncorotaloides rohri mayoensis

Citation: Truncorotaloides rohri var. mayoensis Bronnimann & Bermudez 1953
Rank: Variety
Type locality: Duff road area, near Kelly Junction, about 7 miles east of Pointe-a-Pierre, central Trinidad, B.W.I. Found also at jaruco, Province of Habana, Cuba; and at the type locality of the Guayabal formation, State of Vera Cruz, Mexico.
Type age (chronostrat): Eocene
Type specimens: Plate 87, figures 10-12; T.L.L. Cat. No. 172694
Type repository: Washington; USNM

Linked specimens: USNM-4236

Current identification/main database link: Acarinina rohri (Bronnimann & Bermudez 1953)


Original Description
The general outline of the low trochoidal test is lobate. The almost flat spiral side shows about eleven chambers arranged in two volutions. The five chambers of the final volutions are overlapping, angular, flat at the spiral side and pointed toward the umbilicus. The shape of the early chambers is not known. The umbilicus is deep and small. The sutures are curved in the direction of coiling. The large arcuate aperture of the end chamber is surrounded by a minute lip-like border, and directed into the umbilicus. The earlier apertures are not known. Small, slit-like additional openings occur at the spiral side of the last two chambers at the intersections of radial sutures and the periphery of the preceding volution. These openings are also provided with small lip-like borders. It is not known if such openings exist in the earlier stage. The surface is ornamented by heavy spines which are strongly developed on the initial portion and along the edges and at the pointed umbilical portions of the adult chambers. The flat spiral surfaces and the vicinity of the apertures are without or with rare and small spines only. The walls are perforate. Only two well-preserved specimens were encountered. Both coil to the left. 

Size: Maximum diameter of test 0.45 mm. End chamber: Radial diameter 0.187 mm.; tangential diameter 0.288 mm.; height 0.275 mm.

Etymology: named after the Mayo River, central Trinidad.

Extra details from original publication
Discussion: This variety is the extreme angular type of this group. 

References:

Brönnimann, P. & Bermudez, P. J. (1953). Truncorotaloides, a new foraminiferal genus from the Eocene of Trinidad, B.W.I. Journal of Paleontology. 27: 817-820. gs


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Truncorotaloides rohri mayoensis compiled by the pforams@mikrotax project team viewed: 30-7-2021

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