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Diagnosis. Hedbergellinae with sutural supplementary apertures on the spiral side and a meridional rugosity.
Description. Test free, coiled in a low trochospire, umbilicate; axial periphery rounded to angled with no indication of keel or poreless margin; chambers globular to slightly compressed; sutures radial, depressed on both sides; umbilicus shallow wide; primary aperture single, interiomarginal, umbilical-extraumbilical to spiroumbilical with well-developed lip extending into umbilicus;sutural supplementary apertures on the spiral side (Fig. 1a); surface rugose, covered with meridionally arranged pustules and costellae on both sides; wall calcareous, hyaline, radial in structure, perforate; lips and surface rugosity are generally without pores.
Etymology: Kassabella n. gen. is named in honor of Dr. I. I. Kassab of the Geological Survey and Mineral Investigation of Iraq.
Extra details from original publication
Remarks. The meridional rugosity distinguishesthe present new genus from Loeblichella which lacks such type of ornamentation. This character and the spiral supplementary sutural apertures differentiate Kassabella from Ticinella and Rotalipora, which exhibit supplementary sutural apertures on the umbilical side and have no meridional rugosity. Also, the spiral supplementary apertures distinguish Kassabella from Costellagerina in which such apertures are absent. Similarly, the meridional rugosity and the supplementary apertures differentiate this new genus from Hedbergella, Clavihedbergella and Praeglobotruncana,which lack these characters.
In addition to Loeblichella carteri, designated here as the type species, Loeblichella hessi (Pessagno) of Kassab (1976) can also be assigned to the present new genus.
Stratigraphical Range. Both Loeblichella carteri Kassab and Loeblichella hessi (Pessagno) of Kassab, which are assigned to Kassabella n. gen., were recorded from the Upper Cretaceous succession of northern Iraq. The former species occurs in the middle and upper Maastrichtian portions of the Shiranish and Tanjero Formations (Globotruncana gansseri Subzone-Abathornphalus mayaroensis Subzone). Similarly, L . hessi was found in the lower and middle Maastrichtian of the Shiranish Formation (Globotruncana area Subzone-Globotruncana gansseri Subzone), (Kassab, 1976). Also, this species was recorded from the upper Campanian-lower Maastrichtian sequence of Iraq (Kassab, written communication). Accordingly, the stratigraphical range of Kassabella is late Campanian late Maastrichtian.
El-Nakhal, H.A., (1984). Kassabella, a new Late Cretaceous planktonic foraminiferal genus with meridional rugosity. Journal of Foraminiferal Research, 14: 140-141. Kassab, I.I.M., (1976). Some Upper Cretaceous planktonic foraminiferal genera from northern Iraq. Micropaleontology, 22: 215-238.
El-Nakhal, H.A., (1984). Kassabella, a new Late Cretaceous planktonic foraminiferal genus with meridional rugosity. Journal of Foraminiferal Research, 14: 140-141.
Kassab, I.I.M., (1976). Some Upper Cretaceous planktonic foraminiferal genera from northern Iraq. Micropaleontology, 22: 215-238.
Kassabella compiled by the pforams@mikrotax project team viewed: 22-7-2018
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