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Species Gubkinella graysonensis Tappan 1940


Discussion / Comments:
Leckie (1990):
Distinctive compact, quadrilobate test. In adults, the aperture is a low arch with a thin lip and is umbilical in position. In juveniles,the aperture can be more umbilical-extraumbilical in position(Pl. 1, Fig. 2). Both moderate spired (Pl. 1, Fig. 6) and high spired (Pl.1, Fig. 7) forms are observed in the material from ODP Site 693. This long-ranging taxon is especially characteristic of neritic environments (continental margins, epicontinental seas; e.g., Tappan, 1940;Longoria, 1974) as well as areas of upwelling (e.g., Leckie, 1987). Longoria(1974) reports a lower Aptian (Leupoldina cabri Zone) first occurrence for G. graysonensis.
Pflaumann & Krasheninnikov (1977):
Four globular chambers forming the last whorl, main aperture low, interiomarginal, in the middle part of the last chamber. Initial part of the spira small, acute. The species has been recorded from upper Grayson formation, Texas, from the Lenticulina ouachensis ouachensis Zone of Trinidad. Longoria (1974) gave a range from late Aptian to Cenomanian.
Systematics:

22
 Genus Gubkinella
  Species Gubkinella graysonensis
Synonym list:
Leckie (1990):
1940 Globigerina graysonensis Tappan. - Tappan : p. 122 pl. 19, figs. 15-17
1974 Gubkinella graysonensis Tappan. - Longoria : p. 50 pl. 1, figs. 1-12
1984 Gubkinella graysonensis Tappan. - Leckie : p. 593 pl. 1, figs. 2-3.
1990 Gubkinella graysonensis Tappan. - Leckie : Pl. 1, Figs. 1-7
Pflaumann & Krasheninnikov (1977):
1940 Globigerina graysonensis Tappan. - Tappan : p.122 pl. 19; fig. 15-17
1977 Gubkinella graysonensis Tappan. - Pflaumann & Krasheninnikov : p.553 pl. 1; fig. 9-11
References:

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

Longoria,J.F. (1974):
Stratigraphic, morphologic and taxonomic studies of Aptian planktonic Foraminifera . Revista Espanola de MicropaleontologíaNo extraord p. 1-107

Pflaumann,U. and Krasheninnikov,V.. (1977):
Early Cretaceous planktonic foraminifers from eastern North Atlantic, DSDP Leg 41 .
In: Initial Reports of the Deep Sea Drilling Project 41 , Abidjan, Ivory Coast, to Malaga, Spain, February-April 1975 Eds: Gardner, J..Herring, J.. p. 539-564

Leckie,M.R. (1984):
Mid-Cretaceous planktonic foraminiferal biostratigraphy off Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547 . Initial Reports of the Deep Sea Drilling Project Vol. 79 p. 579–620

Leckie,M.R. (1990):
Middle Cretaceous Planktonic Foraminifers of the Antarctic Margin: Hole 693A, ODP Leg 113.
In: Proceedings of the Ocean Drilling Programme Vol. 113 Eds: Parker, P.F..Kennett, J.P.O'Connell, S..Pisias, N.G. p. 319-324
Anonymous: Unedited TaxonConcept data
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