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Globorotalia (Hirsutella) theyeri Fleisher 1974 from: Kennett, J.Srinivasan, M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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Species Globorotalia (Hirsutella) theyeri Fleisher 1974


Alternative name:
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test large, thin, planoconvex to unequally biconvex, equatorial periphery lobulate with markedly flaring chambers in the final whorl; axial periphery acute, with thin, discontinuous peripheral keel; four to five chambers in the final whorl, increasing moderately to rapidly in size; spiral sutures strongly recurved, depressed, on umbilical side gently curved, to radial, depressed; surface finely and uniformly perforate; umbilicus large, deep; aperture interiomarginal, umbilical-extraumbilical a low arch bordered by a distinct but thin lip.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (H.) theyeri evolved from Gr.(H.) margaritae from which it is distinguished by its distinctly flattened spiral side, its flaring chambers of the final whorl, and a relatively large umbilicus. This species differs from Gr. (H.) scitula in having a distinct but thin peripheral keel and more strongly recurved spiral sutures.
Synonym list:
Kennett & Srinivasan (1983):
1974 Globorotalia theyeri Fleisher. - Fleisher : p.1028 pl 12 fig 9 pl 13
References:

Fleisher,R.L. (1974):
Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A.
In: Initial Reports of the Deep Sea Drilling Project Vol. 23 Eds: Whitmarsh, R.B.Weser, O.E.Ross, D.A. p. 1001-1072

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Anonymous: Unedited TaxonConcept data
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