Guembelitria cenomana Keller 1935 (TaxonConcept

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Species Guembelitria cenomana Keller 1935

Discussion / Comments:

Caron (1985):
The species differs from G. cretacea only in its low apertural arch.
Kroon & Nederbragt (1990):
The test is covered by pore mounds, that are concentrated on the chambers of the last whorls. The aperture is a broad, low arc with lip and toothplate. The type descriptions of G. cenomana, G. harrisi and G. kegeli are nearly identical as far as the shape of the test is concerned and we consider G. cenomana the senior synonym. G. graysonensis is a form with terminal multiserial growth. Guembelitria cenomana has been described from Upper Albian to Lower Turonian sediments, in North and South America and Russia. We found it in sample 1K291 from Cenomanian sediments in West Tunisia (see also Postuma, 1971) and in Eocene (?) samples T25 and T90 from Tanimbar, Indonesia, which contain reworked, small-sized Cretaceous foraminifera only [for details, see De Smet et al., submitted (a) ].

Systematics:

5
Classis Foraminifera
  Familia Heterohelicidae

29
  Subordo Globigerinina
   Superfamilia Heterohelicicea
    Familia Guembelitriidae
     Genus Guembelitria
      Species Guembelitria cenomana

Synonym list:

Caron (1985):

1935 Guembelina cenomana Keller. - Keller : p.547 pl 3 figs 13-14

1940 Guembelitria harrisi Tappan. - Tappan : p.115 pl 19 figs 2a-b

1985 Guembelitria cenomana Keller. - Caron : 55, 56 figs 24.3-4

Kroon & Nederbragt (1990):

1935 Guembelina cenomana Keller. - Keller : 547, 548 pl. 2; figs. 13,14

1940 Guembelitria harrisi Tappan. - Tappan : p.115 pl. 19; fig. 2a, b

1940 Guembelitriella graysonensis Tappan. - Tappan : p.116 pl. 16; fig. 3a-c

1962 Guembelitria kegeli Petri. - Petri : p.87 pl. 10; fig. 12a, b

1970 Guembelitria harrisi Tappan. - Eicher & Worstell : p.296 pl. 8; figs. 1, 2

1990 Guembelitria cenomana Keller. - Kroon & Nederbragt : p.34 pl. 2; figs. 8, 9

References:

Keller,B.M. (1935):
Microfauna of the Upper Cretaceous of the Dnieper-Donetz basin and ajoining areas . Moskov Obshch. Ispytaley Prirody Byull. Otdel Geol. Vol. 13 p. 522-558

Tappan,H. (1940):
Foraminifera from the Grayson Formation of northern Texas . Journal of Paleontology Vol. 14 p. 93-126

Petri,S.. (1962):
Foraminiferos Cretaceos de Sergipe. Vol. 265 p. 101-140

Eicher,D.L. and Worstell,P. (1970):
Cenomanian and Turonian foraminifera from the Great Plains, United States . Micropaleontology Vol. 16 p. 269â€“324

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

Kroon,D. and Nederbragt,A.J. (1990):
Ecology and Paleoecology of Triserial Planktic Foraminifera . Marine Micropaleontology Vol. 16 p. 25-38

Anonymous: Unedited TaxonConcept data

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