Catalog - Rugoglobigerina (Rugoglobigerina) badryi

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Rugoglobigerina (Rugoglobigerina) badryi

Citation: Rugoglobigerina (Rugoglobigerina) badryi El Naggar 1971

Type specimens: Pl. 14, figs. 1, 2, 5, 6, 9, 10, 13; pl. 16, figs. 1-13; pl. 17, fig. 11

Type sample (& lithostrat): Esna Group. Sharawna Shale Formation

Type age (chronostrat): Upper Cretaceous, Maastrichtian

Type locality: Section at Wadii El-Sharawna, on the western slopes of Gebel Owaina, Esna-Idfu region of the Nile Valley, Upper Egypt.

Diagnosis - A Rugoglobigerina (Rugoglobigerina) with a medium to large, low trochospirally coiled test; 5-6 rapidly increasing chambers in the outer whorl; a large, inflated, somewhat radially elongate last chamber, slightly curved, incised intercameral sutures and angular, depressed spiral suture; small to medium-sized umbilicus and a rough surface.

Description - Test medium sized, coiled in a very low trochospire; dorsal side almost flat with a depressed inner part and slightly inflated later chambers; ventral side inflated, protruding; equatorial periphery subovoid, lobate; axial periphery rounded; chambers on the dorsal side about 15, arranged in 2.5, dextrally coiled whorls; the initial chambers are very small, globigerine, depressed and almost masked by surface rugosity; they increase regularly in size until the beginning of the outer whorl where chambers start to become much inflated and increase more rapidly in size with a resultant much larger last chamber which is somewhat elongated in the direction of coiling; chambers in the outer whorl 5.5, globigerine, inflated, except for the last one which is somewhat ovoid; on the ventral side chambers are 5.5, globigerine, inflated, and increase rapidly in size as added; sutures on the dorsal side almost radial, depressed; on the ventral side slightly curved, depressed; spiral suture angular, depressed; umbilicus medium-sized, irregular in outline, covered by tegilla of which remnants are still preserved; primary aperture interiomarginal, umbilical, covered by poorly preserved tegilla; surface coarsely rugose, rugosity in the form of large pustules, meridionally arranged on the chambers of the outer whorl, with the rugosity being gradually reduced towards the last chamber; wall calcareous, perforate, hyaline, except for the imperforate tegilla and surface rugosity.

Holotype: Maximum diameter 0.312 mm., minimum diameter 0.210 mm., thickness 0.100 mm

named after the late Professor HAMFD EL-BADRY, formerly chairman of the Department of Petroleum and Mining Engineering, Cairo University, Egypt.

Remarks. - Rugoglobigerina (R.) badryi El-Naggar is distinguished from R. (R.) hexacamerata Bronnimann, by its smaller, thinner, less regular, ovoid, test: rapidly increasing chambers in the outer whorl; large last chamber which is somewhat elongated in the direction of coiling; relatively smaller umbilicus, and depressed spiral suture. From R. (R.) pustulata Bronnimann it is distinguished, by the above mentioned characters as well as by the less rugose surface. The species is somewhat similar to R. (R.) bronnimanni El-Naggar from which it is distinguished by the much smaller, thinner, more inflated test, more convex dorsal side, more depressed inner whorl and more rounded axial periphery.

Stratigraphical range - The species is abundant in both the Middle and Late Maastrichtian Globotruncana gansseri and Globotruncana esnehensis Zones of the type Sharawna Shale of Egypt.

References:

El-Naggar, Z. R. (1971b). The genus Rugoglobigerina in the Maastrichtian Sharawna Shale of Egypt. In, Farinacci, A. (ed.) Proceedings of the Second Planktonic Conference, Roma 1970. Edizioni Tecnoscienza 477-537. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina (Rugoglobigerina) badryi El Naggar 1971

Rugoglobigerina (Rugoglobigerina) badryi

References:

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