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Rugotruncana circumnodifer Finlay 1940 from: Huber, B.T. (1990): Maestrichtian planktonic foraminifer biostratigraphy of the Maud Rise (Weddell Sea, Antarctica): ODP Leg 113 Holes 689B and 690C. In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 113 Eds: Barker, P.F.Kennett, J.P.O'Connell, S.B.Pisias, N.G. p. 489-513
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Anonymous: Unedited TaxonConcept data
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Species Rugotruncana circumnodifer Finlay 1940


Discussion / Comments:
Huber (1990):
This species is distinguished by having strongly inflated chambers numbering four to five and one-half in the final whorl and paired keels on the equatorial periphery. The keels are usually not visible on the ultimate chambers and are sometimes only expressed by an imperforate peripheral band (e.g., Pl. 4, Figs 8-9). Surface ornament varies from randomly situated, small pustules to well-developed costellae aligned in a meridional pattern. Tegilla are usually preserved on the Maud Rise specimens.
Synonym list:
Huber (1990):
1940 Globigerina circumnodifer Finlay. - Finlay : p. 469 pl. 65, figs. 150-157
1973 Globotruncana (Rugotruncana) circumnodifer Finlay. - Webb : p. 552 pl. 4, figs. 1-4
1990 Rugotruncana circumnodifer Finlay. - Huber : Pl. 4, Figs. 4-10; Pl. 6, Fig. 3
References:

Finlay,H.J. (1940):
New Zealand Foraminifera; key species in stratigraphy . Transactions of the Royal Society of New Zealand Vol. 69

Webb,P.N. (1973):
Upper Cretaceous-Paleocene Foraminifera from Site 208 (Lord Howe Rise, Tasman Sea), DSDP, Leg 21.
In: i Vol. 21 Eds: Burns, R.E.Andrews, J.E.et al. p. 541-573

Huber,B.T. (1990):
Maestrichtian planktonic foraminifer biostratigraphy of the Maud Rise (Weddell Sea, Antarctica): ODP Leg 113 Holes 689B and 690C.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 113 Eds: Barker, P.F.Kennett, J.P.O'Connell, S.B.Pisias, N.G. p. 489-513
Anonymous: Unedited TaxonConcept data
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