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Species Globorotalia (Hirsutella) margaritae Bolli & Bermudez 1965


Alternative name:
Globorotalia margaritae Bolli & Bermudez 1965
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral, compressed, spiral side convex, umbilical side concave to almost flat, equatorial periphery slightly lobulate, axial periphery acute with a thin keel; chambers strongly compressed, five in the final whorl, increasing rapidly in size; sutures on spiral side strongly curved, limbate, slightly raised, on umbilical side gently curved, depressed; surface coarsely and densely perforate, early chambers slightly pustulose, later chambers smooth. Umbilicus narrow; aperture a low slit bordered by a pronounced lip, interiomarginal, extraumbilical-umbilical.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (H.) margaritae differs from its ancestral forms Gr. (H.) scitula and Gr. (H.) juanai by its more convexly rounded spiral side and concave to flat umbilical side, in its more delicate peripheral keel, and in the distinctly elongate, narrower, and more strongly curved chambers as viewed from the spiral side.
Synonym list:
Kennett & Srinivasan (1983):
1965 Globorotalia margaritae Bolli & Bermudez. - Bolli & Bermudez : p.139 pl 1 figs 16-18
1978 Globorotalia margaritae Bolli & Bermudez. - Bolli & Bermudez : p.138 pl 1 figs 1-9
Was used in synonym list of:
Hirsutella margaritae Bolli & Bermudez 1965
Globorotalia margaritae Bolli & Bermudez 1965
References:

Bolli,H.M. and Bermudez,P.J. (1965):
Zonation based on planktonic foraminifers of Middle Miocene to Pliocene warm-water sediments. . Asoc. Venezolana Geol., Miner. Petrol. Bol. Inf. Vol. 8

Bolli,H.M. and Bermudez,P.J. (1978):
A neotype for Globorotalia margaritae Bolli and Bermudez . Journal of Foraminiferal Research Vol. 8(2) p. 138-142

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

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