CATALOG OF ORIGINAL DESCRIPTIONS: Praeglobotruncana coarctata 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 -> P -> Praeglobotruncana -> Praeglobotruncana coarctata
Other pages this level: P. algeriana, P. barbui, P. biconvexa gigantea, P. bronnimanni, P. clotensis, P. coarctata, P. compressa, P. crassa, P. gigantea, P. hagni, P. hansbollii, P. hessi compressiformis, P. hessi hessi, P. hilalensis, P. inermis, P. klausi, P. lehmanni, P. loeblichae, P. mattsoni, P. modesta, P. oraviensis, P. oraviensis trigona, P. pauliani, P. prahovae, P. primitiva, P. pseudoalgeriana, P. rohri, P. shirakinensis, P. stephani gibba

Praeglobotruncana coarctata

Citation: Praeglobotruncana coarctata Bolli 1957
Rank: Species
Type locality: Usine Ste. Madeleine Quarry, southeast end of Naparima HUl, San Fernando,Trinidad (coordinates N:235800 links, E:364000 links). Holotype (USNM P4794) from sample Bt. 37 (TLL 151935); figured paratype (USNM P4795) from sample Bt. 46 (TLL 151943).
Type age (chronostrat): Upper Campanian
Type specimens: P4794 P4795
Type repository: Washington; USNM

Linked specimens: USNM-4794 USNM-4552 USNM-4795

Current identification/main database link: Loeblichella coarctata (Bolli, 1957)

Original Description
Shape of test very low trochospiral, biconvex; equatorial periphery lobate; a faint keel is often observed in last chambers; it may be ornamented with minute spines on peripheral edge. Wall calcareous, perforate, surface smooth. Chambers strongly compressed, 10-12, arranged in 2 whorls; the 5-6 chambers of the last whorl increase rapidly in size; the early whorl minute by comparison. Sutures on spiral side radial or slightly curved, depressed; on umbilical side radial, depressed. At umbilicus each chamber of last whorl extends towards the center, leaving only a small portion open. Aperture a low arched, interiomarginal, extraumbilical-umbilical slit. Coiling predominantly dextral; of 37 specimens counted only 4 coiled sinistrally.

Size: Dimensions of holotype: diameter 0.4 mm.; thickness 0.16 m

Extra details from original publication
Remarks: Praeglobotruncana coarctata, new species, differs from Praeglobotruncana citae (Bolli) in having an almost flat spiral side instead of a convex one and in having usually five chambers in the last whorl instead of four.


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


Praeglobotruncana coarctata compiled by the pforams@mikrotax project team viewed: 22-1-2021

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