CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana repanda Bolli 1957

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 -> G -> Globotruncana -> Globotruncana repanda
Other pages this level: << < G. navarroensis, G. neotricarinata, G. orientalis, G. pessagnoi, G. postrugosa, G. poststephensoni, G. pozaryskae, G. pseudoconica, G. pseudofornicata, G. pura, G. pustulifera, G. putahensis, G. qabeliatensis, G. quadrata, G. renzi, G. repanda, G. riojai, G. roddai, G. rosetta insignis, G. rosetta pettersi, G. rugosa, G. rugosa subrugosa, G. sahakianae, G. samuriensis, G. schneegansi, G. semsalensis, G. sharawnaensis, G. sigmoconcavata, G. smithi, G. stephani, G. stephani turbinata> >>

Globotruncana repanda

Citation: Globotruncana repanda Bolli 1957
Rank: Species
Type locality: Holotype from an exposure in Usine Ste. Madeleine quarry, at the southeastern end of Naparima Hill, San Fernado, western Trinidad (coordinates N:235800 links, E:364000 links), T. W. I.
Type age (chronostrat): Lower Campanian
Type specimens: P4797
Type repository: Washington; USNM

Linked specimens: USNM-4797

Current identification/main database link: Gansserina repanda (Bolli, 1957)


Original Description
Shape of test a very low trochospiral, spiral side concave, umbilical side strongly inflated; equatorial periphery lobate, early chambers of last whorl with double keel, which may be absent in the ultimate and penultimate chambers. Wall calcareous, perforate; surface in well-preserved specimens slightly rugose, especially on the umbilical side. Chambers globular to hemispherical, twelve to fifteen, arranged in two to three whorls; the four chambers of the last whorl increase rapidly in size, earlier whorls small by comparison. Sutures on spiral side almost radial, depressed; on umbilical side radial, depressed. Umbilicus deep, wide. Primary apertures interiomarginal, umbilical; tegillia with accessory apertures not preserved in Trinidad material, but present in specimens of this species from the Gulf Coast. The twenty-five specimens counted all coiled dextrally.

Size: Dimensions of holotype: diameter 0.4 mm. ; thickness 0.24 mm.

Extra details from original publication
Remarks: In its planoconvex shape, Globotruncana repanda, new species, shows similarities to G. helvetica Bolli, G. gansseri Bolli, G. concavata (Brotzen), and G. ventricosa White. It differs from the last two by having in the last whorl fewer and more inflated chambers,
which are bent upwards on the spiral side. It is usually slightly smaller in size. From Globotruncana helvetica and G. gansseri the new species differs in having two peripheral keels, a more concave spiral side, and a less rugose surface. The stratigraphic range of Globo-
truncana repanda is similar to that of G. ventricosa but differs considerably from that of the other three species.

References:

Bolli, H. M. (1957e). The genera Praeglobotruncana, Rotalipora, Globotruncana, and Abathomphalus in the Upper Cretaceous of Trinidad, B. W. I. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 51-60. gs V O

Bolli, H. M. (1957c). The foraminiferal genus Schackoina Thalmann, emended, and Leupoldina, n. gen. in the Cretaceous of Trinidad, B. W. I. Eclogae Geologicae Helvetiae. 50(2): 271-278. gs V O


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Globotruncana repanda compiled by the pforams@mikrotax project team viewed: 5-12-2020

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