Blefuscuiana albiana Boudagher-Fadel et al. 1996 (TaxonConcept

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Species Blefuscuiana albiana Boudagher-Fadel et al. 1996

Discussion / Comments:

Boudagher-Fadel et al. (1997):
Remarks: B. albiana has five subglobular (h/L = 0.8 approx.) chambers in the last whorl, which enlarge rapidly with growth (b/a = 2 approx.), so that the addition of a new whorl increases the dorsal test diameter by almost twice. The umbilicus is small, as in B. infracretacea (u/uh = 0.3 approx.) and is about 18 to 20% of the ventral test diameter. The aperture is slit-like with a thin porticus. The wall is smooth; the microperforations are irregularly spaced and are about 2 µm in diameter (twice as large as those of B. aptiana (Bartenstein) s.1. but about half the size as those of true Hedbergella). There appears to be a slight but progressive increase in test size from B. aptiana (Bartenstein) s.s. (190-270 pm) and B. aptiana (Bartenstein) orientalis BouDagher-Fade1 et al. (210-270 µm) in the Aptian to B. albiana (220-290 pm) in the Albian. It has already been suggested that B. albiana evolved from B. aptiana s.s. above the base of the Albian (BouDagher-Fade1 et al., 1996).

Systematics:

22
Superfamilia Globigerinaceae
  Familia Praehedbergellidae
   Subfamilia Praehedbergellinae
    Genus Blefuscuiana
     Species Blefuscuiana albiana

Synonym list:

Boudagher-Fadel et al. (1997):

1969 Hedbergella infracretacea Glaessner. - Gorbatchik & Kretchmar : p. 50, 51 pl. 1; fig. 5a-c (non Globigerina infracretacea Glaessner, 1937)

p 1975 Hedbergella infracretacea Glaessner. - Magniez-Jannin : p.250 pl. 17; fig. 4, 6, 12, 15

1986 Hedbergella infracretacea Glaessner. - Gorbatchik : p.235 pl. 19; fig. 1, 2

1996 Blefuscuiana albiana Boudagher-Fadel et al.. - Boudagher-Fadel et al. : p.253 fig. 4 (6-9)

1997 Blefuscuiana albiana Boudagher-Fadel et al.. - Boudagher-Fadel et al. : p.137 pl. 8.1; fig. 6-9; Figures: 8.1, 8.3

References:

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

Magniez-Jannin,F.. (1975):
Les Foraminiféres de l'Albien de l'Aube: Paléontologie, Stratigraphie, Écologie . Cahiers de Paléontologie, CNRS, Paris p. 360

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

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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