Taxa are given in age order (time control age-window is: 0-800Ma)![]() | ||||
![]() | Sphaeroidinellopsis paenedehiscens Like S. seminulina but more spherical and tightly coiled test and with longer primary aperture. (with supplementary apertures becomes S. dehiscens). | |||
![]() | Sphaeroidinellopsis kochi Like S. seminulina but somewhat compressed trochospiral test with >3 chambers in final whorl. | |||
Sphaeroidinellopsis seminulina Compact, low trochospiral, subglobular, sutures obscured by secondary cortex Aperture: Umbilical, elongate opening with thickened, crenulated, rim | ||||
Sphaeroidinellopsis disjuncta Intermediate between G. woodi and S. seminulina, test thickened but without cortex. | ||||
Sphaeroidinellopsis sp. Specimens which cannot be assigned to established species |
Parker (1967) and Jenkins (1971) considered Sphaeroidinellopsis to be synonymous with Sphaeroidinella because of close similarities between the two genera. Bé (1965) and Bandy et al. (1967) regarded the genera Sphaeroidinellopsis and Sphaeroidinella to be bathypelagic, isomorphic growth forms of at least two different species of Globigerinoides. They did not consider them to be distinct species within their own right.
The concepts of the genera Sphaeroidinellopsis and Sphaeroidinella employed here are essentially those proposed by Banner and Blow (1959). Sphaeroidinella is derived from Sphaeroidinellopsis in the earliest Pliocene (Blow, 1959, 1969; Lamb and Beard, 1972; Salvatorini and Cita, 1979; Srinivasan and Kennett, 1981b).
Catalog entries: Sphaeroidinellopsis, Prosphaeroidinella
Distinguishing features:
Parent taxon (Globigerinidae): Wall spinose, usually with 3½-6 globular chambers in final whorl, trochospiral or planispiral
This taxon: trochospiral test, globular chambers, and a heavy, smooth, shiny cortex
Phylogenetic relations
Most likely ancestor: Globoturborotalita - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983 f23 (based on evolution of S. disjuncta from G. woodi).
Likely descendants: Sphaeroidinella;
plot with descendants
Geological Range:
Last occurrence (top): at top of N20 zone (100% up, 3.1Ma, in Piacenzian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within N6 zone (17.54-17.59Ma, base in Burdigalian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Primary source for this page: Kennett & Srinivasan 1983, p.204
Bandy, O. L., Ingle, J. C. & Frerichs, W. E. (1967b). Isomorphism in "Sphaeroidinella" and "Sphaeroidinellopsis". Micropaleontology. 13(4): 483-488. gs Banner, F. T. & Blow, W. H. (1959). The classification and stratigraphical distribution of the Globigerinaceae. Palaeontology. 2(1): 1-27. gs Bé, A. , W. H. (1965). The influence of depth on shell growth in Globigerinoides sacculifer (Brady). Micropaleontology. 11(1): 81-97. gs Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. gs Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs Fabbrini, A., Zaminga, I., . Ezard, T. H. G. & Wade, B. S. (2021). Systematic taxonomy of middle Miocene Sphaeroidinellopsis (planktonic foraminifera). Journal of Systematic Palaeontology. 19(13): 953-968. gs Jenkins, D. G. (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin. 42: 1-278. gs Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs Lamb, J. L. & Beard, J. H. (1972). Late Neogene planktonic foraminifers in the Caribbean, Gulf of Mexico, and Italian stratotypes,. University of Kansas Paleontological Contributions, Articles. 57: 1-67. gs O Parker, F. L. (1967). Late Tertiary biostratigraphy (planktonic foraminifera) of tropical Indo-Pacific deep-sea cores. Bulletins of American Paleontology. 52(235): 115203-. gs Salvatorini, G. & Cita, M. B. (1979). Miocene foraminiferal stratigraphy, DSDP site 397 (Cape Bojador, North Atlantic). Initial Reports of the Deep Sea Drilling Project. 47/1: 317-373. gs Srinivasan, M. S. & Kennett, J. P. (1981b). Neogene planktonic foraminiferal biostratigraphy and evolution: equatorial to subantarctic, south Pacific. Marine Micropaleontology. 6: 499-533. gs Ujiie, H. (1976). Prosphaeroidinella, n. gen.: Probable ancestral taxon of Sphaeroidinellopsis (Foraminifera). Bulletin of the national Science Museum, Tokyo. 2(1): 9-26. gsReferences:
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Sphaeroidinellopsis compiled by the pforams@mikrotax project team viewed: 27-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=104215 Go to Archive.is to create a permanent copy of this page - citation notes |