CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana inornata Bolli 1957
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Original Description Shape of test low trochospiral, biconvex; the equatorial periphery strongly lobate, early chambers of last whorl rounded at periphery, last and occasionally penultimate chambers compressed with sharp peripheral edge or faint keel. Wall calcareous, perforate surface of early chambers in well-preserved specimens showing some rugosity. Chambers subangular, compressed; fourteen to sixteen, arranged in three whorls; the four chambers of the last whorl increase rapidly in size, early whorls small by comparison. Sutures of spiral side slightly curved, depressed, of umbilcal side straight, depressed. Umbilical shallow, wide. Primary apertures interiomarginal, umbilical; tegilla with accessory apertures poorly preserved in examined specimens. The coiling predominantly dextral; of fifty specimens counted, only four coiled sinistrally.
Size: Dimensions of holotype: diameter 0.44 mm.; thickness 0.2 mm. Extra details from original publication Range: Globotruncana inornata zone to Globotruncana concavata zone, Naparima Hill formation. Holotype from Globotruncana renzi zone, Naparima Hill formation. Similar forms seem to extend into the Globotruncana fornicata and G. stuarti zones of the Naparima Hill formation. Remarks: Globotruncana inornatata, new species, differs from Globotruncana wilsoni, new species, in having the early chambers of the last whorl roimded at the periphery rather than with a double keel. It also has a longer stratigraphic range than Globotruncana wilsoni, new 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
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
Globotruncana inornata compiled by the pforams@mikrotax project teamviewed: 18-6-2026
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