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


Diagnosis / Definition:
Boudagher-Fadel et al. (1997):
Praehedbergella with four and a half chambers in the last whorl but with only four surrounding the umbilicus; the dorsal surface is flat but the dorsal intercameral sutures are oblique to the spiral suture (not radially arranged) and the dorsal chambers are depressed (hL = 0.6 approx.) and highest posteriorly (L1/L2 = 2.6 approx.). The umbilicus is broad (u/uh = 0.4 approx.) The slitlike aperture possesses a broad porticus. The chambers of the last whorl are quite thick (h/t = 0.6 approx.). No perforation cones are yet known.
Discussion / Comments:
Boudagher-Fadel et al. (1997):
Remarks: This is the only species of Praehedbergella in which the chambers of the last whorl are at their highest point posteriorly. Because of this character, specimens from the North Sea Wells were originally called P. tuschepsensis (Antonova) as Gorbachik's figure (1986, plate 25, fig. l), called by her by that species name, also had posteriorly high chambers. However, examination of type material of P. tuschepsensis, as noted above in the Introduction (p. 105), has shown that the specimen figured by Gorbachik is really a Blefuscuiana. This Praehedbergella therefore needs a new name. We are pleased to dedicate it to Dr Svetlana Yakovleva of St Petersburg.
Systematics:

22
 Superfamilia Globigerinaceae
  Familia Praehedbergellidae
   Subfamilia Praehedbergellinae
    Genus Praehedbergella
     Species Praehedbergella yakovlevae
Synonym list:
Boudagher-Fadel et al. (1997):
1993 Praehedbergella tuschepsensis Antonova. - Banner et al. : p. 8, 9 pl. 2; fig. 4a-c (non Globigerina tuschepsensis Antonova, 1964)
1997 Praehedbergella n sp. yakovlevae . - Boudagher-Fadel et al. : p.119 pl. 7.4; fig. 8-10; Figure: 7.1
References:

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

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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