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Species Praeorbulina transitoria Blow 1956


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral, bilobate, chambers spherical, penultimate and ultimate chambers almost equal in size, embracing in early chambers; sutures on spiral side slightly curved to radial, depressed; surface distinctly cancellate; apertures multiple, narrow, small slits confined to last sutures of the final and earlier chambers.
Discussion / Comments:
Kennett & Srinivasan (1983):
Pr. transitoria has an intermediate morphology linking its ancestor Gs. sicanus and its descendant 0. bilobata.
Bolli & Saunders (1985):
The presence of more than 2 apertures betwen the last chamber and earlier ones places this species in the genus Praeorbulina. It differs from G. bisphericus in being more symmetrically bilobate with the penultimate chamber occupying proportionally more of the test; morphologically intermediate forms can be found.
Synonym list:
Kennett & Srinivasan (1983):
1956 Praeorbulina transitoria Blow. - Blow : p.65 Text fig 2, no 12-13
Bolli & Saunders (1985):
1956 Globigerinoides transitoria Blow. - Blow : p.65 text-figs. 2.12-13
1985 Praeorbulina transitoria Blow. - Bolli & Saunders : p.200 figs. 23.6; 7,9,12
Vincent & Toumarkine (1990):
1956 Globigerinoides transitoria Blow. - Blow : p.65 fig. 2, nos. 12-13
1990 Praeorbulina transitoria Blow. - Vincent & Toumarkine : p.804
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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