What is Nummulites depressus Kenawy 1978? Evolution of Nummulites fabianii group in the Middle Eocene of Egypt

New species Nummulites vetustufabianiin. sp. is described from the El Hamra Formation, Gara El Hamra section Bahariya Oasis Western Desert. The biometrical measurements include maximum and minimum diameter of the successive radii and heights of whorls, length/height ratio, number of chambers and the...

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Bibliographic Details
Published in:Historical biology 2015-10, Vol.27 (7), p.847-860
Main Authors: Boukhary, Mohamed, Naby, Ahmed Ibrahim Abd El, Menoufy, Safia Al, Mahsoub, Mohamed
Format: Article
Language:English
Subjects:
Bahariya Oasis (Garra El Hamra)
Egypt
Middle Eocene
Nile Valley (Gebel Mokattam and Qarara)
Nummulites
Qatar (Umm Bab)
systematic paleontology
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Summary:New species Nummulites vetustufabianiin. sp. is described from the El Hamra Formation, Gara El Hamra section Bahariya Oasis Western Desert. The biometrical measurements include maximum and minimum diameter of the successive radii and heights of whorls, length/height ratio, number of chambers and the marginal cord thickness of each whorl for the megalospheric generation as well as the diameter of proloculus were elaborated to differentiate between some allied granulated species such as Nummulites depressus, Nummulites decrouezae, Nummulites cuvillieri and N. vetustufabianiin. sp.Nummulites fabianii group has lateral distribution for the entire Tethys basin, hence such biometrical studies are needed to emphasise the polyphyletic nature of the group.
ISSN:0891-2963
1029-2381
DOI:10.1080/08912963.2014.906410