CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia occlusa Loeblich and Tappan 1957
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Citation: Globorotalia occlusa Loeblich and Tappan 1957Rank: SpeciesType specimens: Holotype (USNM P5874)
Figured paratype (USNM P5866)Type sample (& lithostrat): Velasco formationType locality: Types and occurrence: Holotype (USNM P5874) from the Velasco formation, middle bed at road crossing of arroyo halfway between San Jos6 de las Rusias and Soto la Marina, Tamaulipas, Mexico. Collected by R. Wright Barker.
Figured paratype (USNM P5866) from the Vincentown formation, north bluff of Rancocas Creek, 0.3 to 0.5 miles northwest of Vincentown, Burlington County,
New Jersey.
Collected by A. R. Loeblich, Jr., and Norman Sohl.
This species also occurs in the Salt Mountain limestone of Alabama and the Aquia formation of Virginia.Type repository: Washington; USNM
Original Description Test free, of medium size, trochospiral, spiral side flat, umbilical side convex with a very small and deep umbilicus, periphery keeled, peripheral outline entire to slightly lobulate; chambers gradually increasing in size, 4 to 5, rarely 6, in the final whorl, of greatest thickness at the umbilical shoulder immediately adjacent to the narrow umbilicus, umbilical shoulder subacutely rounded; sutures distinct, curved and oblique, thickened and flush to slightly elevated on the spiral side; radial and moderately depressed on the umbilical side; wall calcareous, finely perforate, surface smooth except for the thickened sutures on the spiral side and the peripheral keel which may be marginally nodose to hirsute, umbilical side with a somewhat granular appearance, particularly in the early region of the final whorl; aperture an interiomarginal, umbilical-extraumbilcal arch with a distinct lip above. Size: Greatest diameter of holotype 0.45 mm. Etymology: The specific name is from the Latin occlusus, shut up, closed, and refers to the narrow umbilicus. Extra details from original publication
Remarks: Globorotalia occlusa, new species, differs from G. velascoensis (Cushman) and G. acuta Toulmin in being smaller, of less thickness, and in having a small, almost closed umbilicus in place of the wide umbilicus and sharply angled, highly ornamented umbilical shoulder. It also differs from G. velascoensis in having fewer chambers per whorl and from G. acuta in having elevated sutures on the spiral side.
It differs from G. crater Finlay in having a more narrow umbilicus and a less elevated umbilical side.
Editors' Notes
References:
Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. 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: 173-198. gsVO
Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs
Globorotalia occlusa compiled by the pforams@mikrotax project teamviewed: 27-1-2023
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