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Species Pseudoguembelina costulata Cushman 1938


Discussion / Comments:
Caron (1985):
Each chamber has two supplementary apertures near the median tine on either side of the test, covered by arched and tubuliform lobes. P. costulata differs from P. excolata in having a smaller test, narrower in lateral view, finer costae and narrower flaps above the supplementary apertures.
Van Eijden & Smit (1991):
Remarks. This species is extremely rare in the upper Maestrichtian at Site 758.
Systematics:

5
 Classis Foraminifera
  Familia Heterohelicidae
   Genus Heterohelix
    Species Heterohelix globulosa
     Species Heterohelix reussi
      Species Pseudoguembelina costulata
Synonym list:
Caron (1985):
1938 Guembelina costulata Cushman. - Cushman : p.16 pl 3 figs 7a-b
1985 Pseudoguembelina costulata Cushman. - Caron : 55, 56 figs 24.20-21
Van Eijden & Smit (1991):
1946 Guembelina costulata Cushman. - Cushman : p.108 pl. 46, figs. 10a-10b
1991 Pseudoguembelina costulata Cushman. - Van Eijden & Smit : p.104
References:

Cushman,J.A. (1938):
Additional new species of American Cretaceous foraminifera . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 14 p. 2–28

Cushman,J.A. (1946):
Upper cretaceous foraminifera of the Gulf Coastal Region of the United States and adjacent areas . Professional Papers of the US Geological Survey Vol. 206 p. 1-241

Caron,M. (1985):
Cretaceous planktic foraminifera.
In: Plankton stratigraphy Eds: Bolli, H.M.Saunders, J.B.Perch-Nielsen, K. p. 17–86

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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