Blefuscuiana infracretacea Glaessner 1937 (TaxonConcept

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Species Blefuscuiana infracretacea Glaessner 1937

Discussion / Comments:

Boudagher-Fadel et al. (1997):
Remarks: B. infracretacea s.s. has five chambers in the last whorl and strongly developed perforation cones. It grades into infracretacea (Glaessner) occidentalis BouDagher-Fade1 et al. which has five chambers in the last whorl and lacks perforation cones. The existence of this morphological grade is exemplified by the specimen shown on Plate 8.7, Figs 12-15, which still has five chambers in the whorl but which lacks perforation cones except for their weak development on the first chamber of the last whorl. This transitional form demonstrates one of the reasons why we consider the presence or absence of perforation cones to be indicative of subspecific distinction only. Weiss (1995) illustrated a similar form (as Hedbergella delrioensis) from the Early to Middle Aptian of the Wiechendorf 1/86 Borehole, north of Hannover.

Synonym list:

Boudagher-Fadel et al. (1997):

1937 Globigerina infracretacea Glaessner. - Glaessner : p.28 text-fig. 1

1951 Globigerina aptica Agalarova. - Agalarova : p.49 pl. 8; fig. 9-11

1960 Globigerina infracretacea gargasiana Moullade. - Moullade : p.136 pl. 2; fig. 21, 23-25

1960 Globigerina infracretacea gargasiana Moullade. - Moullade : p.214

1966 Hedbergella infracretacea Glaessner. - Glaessner : p. 179-184 pl. 1; fig. 1a-3c

1969 Hedbergella aptica Agalarova. - Gorbatchik & Kretchmar : p. 50, 51 pl. 1; fig. 1a-c

1986 Hedbergella aptica Agalarova. - Gorbatchik : p.94 pl. 14; fig. 4, 5 (not 2, 3)

1988 Blefuscuiana cf. aptica Agalarova. - Banner & Desai : p.160 pl. 3; fig. 4, 5a, b

1993 Blefuscuiana infracretacea sensu stricto Glaessner. - Banner et al. : p.11 pl. 4, fig. 2; pl. 8, fig. 1

1995 Hedbergella delrioensis Carsey. - Weiss : pl. 1; fig. 1, 2

1995 Hedbergella infracretacea Glaessner. - Weiss : pl. 1; fig. 4

1996 Blefuscuiana infracretacea Glaessner. - Boudagher-Fadel et al. : p. 246-249 fig. 1 (1-8); fig. 2 (1-3)

1997 Blefuscuiana infracretacea sensu stricto Glaessner. - Boudagher-Fadel et al. : p.149 pl. 8.7; fig. 1-8; Figure: 8.1, 8.3

1997 Blefuscuiana infracretacea Glaessner. - Boudagher-Fadel et al. : pl. 3; fig. 1 (in press)

Was used in synonym list of:

Praehedbergella infracretacea Glaessner 1937

References:

Glaessner,M.F. (1937):
Planktonische Foraminiferen aus der Kreide und dem Eozän und ihre stratigraphische Bedeutung.
In: Studies in Micropaleontology Vol. 1(1) p. 27-46

Agalarova,D.A. (1951):
Studies of microfauna from Cretaceous deposits of Azerbaydzhan. p. 128 pp

Moullade,M. (1960):
Sur quelques foraminiferes du cretace inferieur des Baronnies (Drome) . Revue de Micropaléontologie Vol. 2 p. 131-142

Glaessner,M.F. (1966):
Notes on foraminifera of the genus Hedbergella . Ecoglae geologicae Helvetiae Vol. 59 p. 179-185

Gorbatchik,T.N. and Kretchmar,V. (1969):
Planktonic foraminifera of Aptian-Albian deposits of Crimea . Vestnik Moskovskogo Universiteta (Series 4, Geology) Vol. 3 p. 45-56

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

Banner,F.T.; Copestake,P.. and White,M.R.. (1993):
Barremian-Aptian Praehedbergellidae of the North Sea area: a reconnaissance . Bulletin of The Natural History Museum, London (Geology) Vol. 49 p. 1-30

Weiss,W.. (1995):
Aptian planktonic foraminifers from the Wiechendorf 1/86 Borehole. . Geologisches Jahrbuch (series A) Vol. 141 p. 113-131

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

Boudagher-Fadel,M.K.; Banner,F.T.; Gorbatchik,T.N. and Simmons,M.D. (1997):
Barremian-Aptian planktonic foraminifera from the Crimea, compared to those from Tunisia and the North Sea area..
In: Micropalaeontology of the Former Soviet Union Eds: Simmons, M.D.

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