What are Nummulites discorbinus, N. beaumonti (Neotypes) and N. qurnensis n.sp.? Biometry and stratigraphic significance from the Middle Eocene, Egypt
Boukhary, professor Mohamed; safia Almenoufy; Abd el Naby;
Abstract
Nummulites beaumonti d’Archiac & Haime, 1853, originally described from El Basatin, Gebel Mokattam, Greater Cairo,
is redefined from a nummulitic bank at the base of the Maadi Formation from its type locality as neotype. Schaub (1981)
described the species from Libya and the type example of this species is still unknown. N. discorbinus Schlotheim (1820)
is described as neotype from a nummulitic bank in the Mokattam Formation, which is located in the site of the Citadel
tombs, near the Salah El Din Citadel, Gebel Mokattam, Egypt. According to Schaub (1981), the type example of this
species is also unknown. For this reason the establishment of the neotypes of these two widespread nummulites species: N.
discorbinus (Late Lutetian) and N. beaumonti (Bartonian) is important and tackled in this paper. N. qurnensis n. sp. ( ¼ N.
sp. cf. beaumonti in Boukhary et al. 2002) is introduced as a new species from the lower Bartonian part of the Qurn
Formation of Helwan. Biometrical studies are carried out on the three species to present up to date information on these
Nummulites, with particular attention to their biostratigraphic correlation with the Shallow Benthic Zones (SBZ) of Serra-Kiel et al. 1998. The authors would like to stress the importance of a careful designation of a neotype to avoid the
is redefined from a nummulitic bank at the base of the Maadi Formation from its type locality as neotype. Schaub (1981)
described the species from Libya and the type example of this species is still unknown. N. discorbinus Schlotheim (1820)
is described as neotype from a nummulitic bank in the Mokattam Formation, which is located in the site of the Citadel
tombs, near the Salah El Din Citadel, Gebel Mokattam, Egypt. According to Schaub (1981), the type example of this
species is also unknown. For this reason the establishment of the neotypes of these two widespread nummulites species: N.
discorbinus (Late Lutetian) and N. beaumonti (Bartonian) is important and tackled in this paper. N. qurnensis n. sp. ( ¼ N.
sp. cf. beaumonti in Boukhary et al. 2002) is introduced as a new species from the lower Bartonian part of the Qurn
Formation of Helwan. Biometrical studies are carried out on the three species to present up to date information on these
Nummulites, with particular attention to their biostratigraphic correlation with the Shallow Benthic Zones (SBZ) of Serra-Kiel et al. 1998. The authors would like to stress the importance of a careful designation of a neotype to avoid the
Other data
Title | What are Nummulites discorbinus, N. beaumonti (Neotypes) and N. qurnensis n.sp.? Biometry and stratigraphic significance from the Middle Eocene, Egypt | Authors | Boukhary, professor Mohamed ; safia Almenoufy ; Abd el Naby | Issue Date | Feb-2013 | Journal | Historical Biology Vol. 25, No. 1, February 2013, 27–41 |
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