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Species Conoglobigerina gulekhensis Gorbatchik & Poroshina 1979


Discussion / Comments:
Boudagher-Fadel et al. (1996):
Remarks: The aperture of this species is not clear on the metatype figured here (Plate 2.6, Fig. 15) but there is an indication of a sedimentfilled intraumbilical arch with a thin rim. This aperture and umbilicus are very similar to those drawn by Gorbachik and Poroshina (1979, textfig. 1b), and are clearly conoglobigerine. The sculpture of the wall surface consists of separate pseudomuricae and short ridges formed by their fusion; these ridges form broken cells, very close to a reticulate, favose pattern, but as yet incomplete. There can be no doubt that C. gulekhensis is very closely ancestral to the earliest Favusella, a genus which appears in the Hauterivian (or even slightly earlier, in the Berriasian, according to Wemli et al., 1995; our Plate 4.2). The chamber shape, umbilical size and shape, aperture and wall sculpture are very similar to those of the contemporary C. caucasica (Gorbachik and Poroshina). The principal difference between the two taxa is the height of the spire and very convex dorsal side of the test of C. gulekhensis. It is possible that C. gulekhensis is the microspheric form, and C. caucasica the megalospheric partner of a dimorphic pair (as suggested by Gorbachik and Poroshina, 1979, p. 24), but the early whorls of each 'species' so far imaged by SEM are obscure and this relationship is not yet proven.
Systematics:

22
 Subordo Globigerinina
  Superfamilia Favusellacea
   Familia Conoglobigerinidae
    Genus Conoglobigerina
     Species Conoglobigerina gulekhensis
Synonym list:
Boudagher-Fadel et al. (1997):
1979 Globuligerina gulekhensis Gorbatchik & Poroshina. - Gorbatchik & Poroshina : 24-26 pl. 1; fig. 1a-1d, 2a-2d; text-fig. 1a-c
1983 Globuligerina gulekhensis Gorbatchik & Poroshina. - Gorbatchik & Kuznetsova : 459-466 pl. 2; fig. 5
1986 Globuligerina gulekhensis Gorbatchik & Poroshina. - Gorbatchik : p.80 pl. 10; fig. 3
1988 Conoglobigerina gulekhensis Gorbatchik & Poroshina. - Banner & Desai : p.148
1995 Conoglobigerina gulekhensis Gorbatchik & Poroshina. - Boudagher-Fadel et al. : 184-186 pl. 1; fig. 1a, b
1997 Conoglobigerina gulekhensis Gorbatchik & Poroshina. - Boudagher-Fadel et al. : p.43 pl. 2.6; fig. 13-15; Figure: 2.2
References:

Gorbatchik,T.N. and Poroshina,L.A.. (1979):
New Berriasian planktonic foraminifera from Azerbaijan . Paleontologicheskii Zhurnal Vol. 13 p. 22-287

Gorbatchik,T.N. and Kuznetsova,K.I. (1983):
Jurassic and Early Cretaceous planktonic foraminifera (Favusellidae). Stratigraphy and paleobiogeography . Zitteliana Vol. 10 p. 459-466

Gorbatchik,T.N. (1986):
Jurassic and Early Cretaceous planktonic foraminifera of the south of the USSR [in Russian]. p. 239

Banner,F.T. and Desai,D. (1988):
A review and revision of the Jurassic-Early Cretaceous Globigerinina, with special reference to the Aptian assemblages of Speeton (North Yorkshire, England) . J. micropalaeontol. Vol. 7(2) p. 143-185

Boudagher-Fadel,M.K.; Banner,F.T.; Bown,P.R..; Simmons,M.D. and Gorbatchik,T.N. (1995):
Gorbachikella from the Hauterivian, Barremian-Aptian of Tunisia . Revue de Micropaléontologie Vol. 38 p. 179-193

Boudagher-Fadel,M.K.; Banner,F.T.; Gorbatchik,T.K.; Simmons,M.D. and Whittaker,J.E. (1996):
Evolution in the Early Cretaceous planktonic foraminiferal genus Blefuscuiana . Jahrbuch für Geologie und Paläontologie, Abhandlungen Vol. 202 p. 243-258

Boudagher-Fadel,M.K.; Banner,F.T.; Whittaker,J.E. and Simmons,M.D. (1997):
Early Evolutionary History of Planktonic Foraminifera. Vol. 1
Anonymous: Unedited TaxonConcept data
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