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Species Heterohelix planata Cushman 1938


Discussion / Comments:
Huber (1990):
Compressed forms with apertures bordered by imperforate flanges and bearing faint, discontinuous costae and sometimes thin keels on the early chambers are included in this species.
Van Eijden & Smit (1991):
Remarks. Intermediate forms with H. globulosa (Ehrenberg, 1840), which has more globular chambers, and H. rajagopalani (Govindan, 1972), which is ornamented, are common. It typically dominates the 125-250-ìm fraction of the pre-Maestrichtian samples. Although the species has a conspicuous first appearance within the Campanian at Site 754, it is known to range from the lowermost Campanian to the Maestrichtian.
Synonym list:
Huber (1990):
1977 Heterohelix pulchra Brotzen. - Sliter : p. 541 pl. 6, figs. 7-9.
1990 Heterohelix planata Cushman. - Huber : Pl. 1, Figs. 5-6
Van Eijden & Smit (1991):
1938 Guembelina planata Cushman. - Cushman : 12-13 pl. 2, figs. 13a-14
1991 Heterohelix planata Cushman. - Van Eijden & Smit : p.104
References:

Cushman,J.A. (1938):
Cretaceous species of Guembelina and related genera . Cushman Lab. Foraminiferal Res. Contrib. Vol. 14 p. 2-28

Sliter,W.V. (1977):
Cretaceous foraminifers from the southwestern Atlantic Ocean, Leg 36, Deep Sea Drilling Project.
In: Initial Reports of the Deep Sea Drilling Project Vol. 36 Eds: Barker, P.F.Dalziel, E.W.D.Al, E. p. 519-573

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

Van Eijden,A.J.M. and Smit,J. (1991):
Eastern Indian Ocean Cretaceous and Paleogene quantitative biostratigraphy.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 121 Eds: Weissel, J.Peirce, J.Taylor, E.Alt, J. p. 77-123
Anonymous: Unedited TaxonConcept data
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