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Subspecies Sphaeroidinellopsis seminulina seminulina Schwager 1866


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral, compact, equatorial periphery broadly ovate to slightly trilobulate; three subglobular chambers in the final whorl; sutures obscured by heavy cortex; surface coarsely perforate, covered by secondary layer of shell material (cortex) reducing the pore openings and providing a smooth, polished, and glossy appearance to the test . Umbilicus open; aperture an elongate umbilical opening bordered by thickened crenulate margin.
Discussion / Comments:
Srinivasan (1975):
This form is characterized by having only three chambers in the final whorl, a distinctly lobate equatorial outline, and a low umbilical aperture. Sphaeroidinella rutschi (figured by Bolli, 1957, pl. 26, figs. 6-7) is considered to be a junior synonym of S. seminulina seminulina (Schwager).
Synonym list:
Kennett & Srinivasan (1983):
1866 Globigerina seminulina Schwager. - Schwager : p.256 pl 7 fig 112
Srinivasan (1975):
1866 Globigerina seminulina Schwager. - Schwager : p.256 pl. 7, fig. 112
1975 Sphaeroidinellopsis seminulina seminulina Schwager. - Srinivasan : p.149 pl. 4; fig. 14-15
Quilty (1976):
1866 Sphaeroidinellopsis seminulina seminulina Schwager. - Schwager : p.256 pl. 7, fig. 112
1969 Sphaeroidinellopsis seminulina seminulina Schwager. - Blow : p.337 pl. 30, fig. 7
1976 Sphaeroidinellopsis seminulina seminulina Schwager. - Quilty : p.685 pl. 10, figs. 1-2
Was used in synonym list of:
Sphaeroidinellopsis seminulina Schwager 1866
References:

Schwager,C. (1866):
Fossile Foraminiferen von Kar Nikobar, Reise der Oesterreichischen Fregatte Novara um Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. Von Wuellerstorf-Urbair . Geologischer Theil,Geologische Beobachtung no. 2, Palaeontologische Mittheilung Vol. 2(1) p. 187-268

Blow,W.H. (1969):
Late middle Eocene to Recent planktonic foraminiferal biostratigraphy.
In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422

Srinivasan,M.S. (1975):
Middle Miocene Planktonic Foraminifera from the Hut Bay Formation, Little Andaman Island, Bay of Bengal . Micropaleontology Vol. 21(2) p. 133-150

Quilty,P.G.. (1976):
Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34

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

Anonymous: Unedited TaxonConcept data
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