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Praehedbergella ruka Banner et al. 1993 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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Species Praehedbergella ruka Banner et al. 1993


Discussion / Comments:
Boudagher-Fadel et al. (1997):
Remarks: P. ruka s.s has five chambers in the penultimate whorl, but only four abutting the umbilicus in the final whorl. The dorsal surface is strongly convex (d/t = 0.5 approx.), the chambers are slightly depressed (h/L = 0.8 approx.) and increase in size gradually with growth (b/a = 1.8 approx.). The umbilicus is small (uh/u = 0.15 approx.) and the aperture is a narrow slit.
Synonym list:
Boudagher-Fadel et al. (1997):
1993 Praehedbergella ruka sensu stricto Banner et al.. - Banner et al. : p.6 pl. 1; fig. 2a-c
1997 Praehedbergella ruka sensu stricto Banner et al.. - Boudagher-Fadel et al. : p.115 pl. 7.2; fig. 7-9; 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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