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Subspecies Praehedbergella tuschepsensis perforare Banner et al. 1993


Discussion / Comments:
Boudagher-Fadel et al. (1997):
Remarks: P. tuschepsensis perforare has about five chambers in the penultimate whorl, reducing to four in the last whorl. The spiral side is almost flat. The chambers are symmetrical and highest in their mid-points (L' =L") and increase significantly in size and growth. The last chambers are slightly depressed (h/L = 0.92 approx.). The umbilicus is shallow and broad. The aperture is a narrow slit bordered with a porticus. Perforation cones are visible at least on the chambers of the last whorl. Following the revision of P. tuschepsensis, this taxon (previously regarded as a subspecies of P. grigelisi) is transferred to Antonova's species. P. tuschepsensis perforare differs from P. tuschepsensis s.s. in having perforation cones and a shallower umbilicus. The presence of perforation cones in this subspecies is of particular interest since these have not been previously recorded for any other member of this genus.
Systematics:

22
 Superfamilia Globigerinaceae
  Familia Praehedbergellidae
   Subfamilia Praehedbergellinae
    Genus Praehedbergella
     Subspecies Praehedbergella tuschepsensis perforare
Synonym list:
Boudagher-Fadel et al. (1997):
1993 Praehedbergella grigelisi perforare Banner et al.. - Banner et al. : p.5 pl. 1; fig. 1a-d
1997 Praehedbergella tuschepsensis perforare Banner et al.. - Boudagher-Fadel et al. : p.113 pl. 7.1; fig. 8-11; 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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