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Subspecies Praeorbulina glomerosa curva Blow 1956


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test large, subspherical to spherical, last chamber subglobular, inflated and embracing between 40 to 70 percent of the earlier test; surface coarsely perforate; sutures slightly curve to radial, depressed; primary aperture of the early portion is covered by the final embracing chamber, which has four to eight small, sutural, supplementary apertures.
Discussion / Comments:
Kennett & Srinivasan (1983):
Pr. glomerosa curva exhibits intermediate morphology between its ancestor Globigerinoides sicanus and its descendant Pr. glomerosa glomerosa. It is distinguished from Globigerinoides in having an almost spherical test and in the more numerous supplementary apertures of the last chamber. With the final chamber enveloping progressively more of the earlier portion and a concomitant increase in the number of slitlike supplementary apertures, this species changes into Pr. glomerosa glomerosa. The evolutionary appearance of Pr. glomerosa curva marks a distinct widespread datum in the late Early Miocene.
Bolli & Saunders (1985):
P. glomerosa glomerosa differs from P. glomerosa curva in having more apertures around the base of the last chamber and in possessing a test that is almost spherical in outline due to the high degree of envelopment by the last chamber.
Synonym list:
Kennett & Srinivasan (1983):
1956 Praeorbulina glomerosa curva Blow. - Blow : p.64 text fig 1, no 9-14
Bolli & Saunders (1985):
1956 Globigerinoides glomerosa curva Blow. - Blow : p.65 text-figs. 1.10-11
1985 Praeorbulina glomerosa curva Blow. - Bolli & Saunders : p.200 figs. 23.5, 24.6; 7,9,12
Vincent & Toumarkine (1990):
1956 Globigerinoides glomerosa curva Blow. - Blow : p.64 fig.1, nos. 9-14
1990 Praeorbulina glomerosa curva Blow. - Vincent & Toumarkine : p.831 pl.2, figs.25-26
References:

Blow,W.H. (1956):
Origin and evolution of the foraminiferal genus Orbulina d'Orbigny . Micropaleontology Vol. 2(1) p. 57-70

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

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

Vincent,E. and Toumarkine,M. (1990):
Neogene planktonic foraminifers from the Western Tropical Indian Ocean, Leg 115.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 115 Eds: Duncan, R.A..Backman, J.Peterson, L.C. p. 795-836
Anonymous: Unedited TaxonConcept data
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