Original Description Test medium to large sized, low trochoidal through- out the ontogeny. Spiral side with about 2 whorls, initial portion depressed. Umbilicus variable in diameter, as a rule large, circular and deep, and provided with a delicate covering plate (only preserved as fragments or not observed). Chambers increasing in size as added, subglobular in early stages, those of last volution truncate toward umbilicus, rounded peripherally, occasionally elongate in direction of spiral axis. The end chamber can be larger, of the same size, or even smaller than the penultimate one and in many forms it is shifted toward the umbilical side. Early chambers of last volution with hantkeninoid points, or provided with large pustules, or irregularly rugose, or ornamented by distinct rows of rugosities radiating from a central point on the periphery toward the apertural face (meridional pattern). Plummer (1926. pp. 38-39) describes this feature as follows: "..irregularly developed rugosities or even indistinct, discontinuous, and rugulose ridges that radiate backward over each chamber from a central point on its periphery." The meridional arrangement of the rugosities is typically developed on all or on part of the chambers of the adult volution. Sutures are well marked, straight to slightly curved in direction of coiling. Apertures of end chambers, large, arcuate, directed into umbilicus and occasionally provided with minute liplike projections. Size: Etymology: Extra details from original publication Remarks.—The subgenus Rugoglobigerina comprises 3 well-defined species, R. reicheli, R. macrocephala, and R. rugosa, each of them split into a number of closely interrelated subspecies. In spite of the development of short hantkeninoid points in early chambers of the adult volution of R. reicheli reicheli, it maintains its distinct Globigerina character. Rugoglobigerina is separated from the hantkeninoid subgenus Plummerella by the distinctly Globigerina-like test.
Occurrence.—Upper Cretaceous Trinidad, B. W. I., Eastern Venezuela, Texas, U. S. A., Egypt. Editors' Notes
Brönnimann, P. (1952c). Globigerinidae from the Upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad, B. W. I. Bulletins of American Paleontology. 34(140): 1-70. gs
Plummer, H. J. (1926). Foraminifera of the Midway formation in Texas. University of Texas Bulletin. 2644: 1-206. gs
Rugoglobigerina (Rugoglobigerina) compiled by the pforams@mikrotax project teamviewed: 24-5-2022