Sphaeroidinellopsis

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Sphaeroidinellopsis
Sister taxa: Beella, Globigerina, Globigerinella, Protentella, Globigerinoides, Globigerinoidesella, Globoturborotalita, Orbulina, Praeorbulina, Sphaeroidinella, Sphaeroidinellopsis, Trilobatus, Turborotalita, Catapsydrax, Clavatorella, Paragloborotalia, Orcadia,

Distinguishing features: trochospiral test, globular chambers, and a heavy, smooth, shiny cortex

Daughter taxa: (blue => in age window 0-300Ma)
Like S. seminulina but more spherical and tightly coiled test and with longer primary aperture. (with supplementary apertures becomes S. dehiscens).
Like S. seminulina but somewhat compressed trochospiral test with >3 chambers in final whorl.
Compact, low trochospiral, subglobular, sutures obscured by secondary cortex
Aperture: Umbilical, elongate opening with thickened, crenulated, rim
Intermediate between G. woodi and S. seminulina, test thicckened but without cortex.
Specimens which cannot be assigned to established species

Taxonomy

Citation: Sphaeroidinellopsis Banner & Blow, 1959
Rank: genus
Type species: Globigerina seminulina
Synonyms:
Taxonomic discussion: Banner and Blow (1959) erected Sphaeroidinellopsis for globigerine-like forms possessing a trochospiral test, globular chambers, no supplementary aperture in the adult, and a heavy, smooth, and shiny cortex with perforations. The genus Sphaeroidinellopsis closely resembles Sphaeroidinella Cushman, but the latter is distinguished by its supplementary sutural apertures in the adult.
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: Prosphaeroidinella;
Sphaeroidinellopsis;

Type images:

Distinguishing features: trochospiral test, globular chambers, and a heavy, smooth, shiny cortex

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description

Biogeography and Palaeobiology


Phylogenetic relations: The evolution of Sphaeroidinellopsis from the Globoturborotalita woodi lineage has recently been described by Srinivasan and Kennett (1981b) . It is well known that Sphaeroidinellopsis and Sphaeroidinella are largely restricted to the tropical areas during the Late Neogene and are rare in temperate areas. However, the evolution of the earliest members of this lineage took place from G. woodi not in the tropics but in temperate to warm-subtropical water masses (Text Fig. 23). An Early Miocene gradation from G. woodi to Sphaeroidinellopsis disjuncta has been documented in the temperate and warm-subtropical sites (Sites 206 and 208) but not in a tropical site (Site 289), where both of these elements are missing (Srinivasan and Kennett, 1981b). In the tropics, the first appearance of Sphaeroidinellopsis is as Ss. seminulina, which represents a late migration to the tropics during the Early Miocene. It seems that by the Late Miocene, Sphaeroidinellopsis was largely biogeographically restricted to the tropical and warm-subtropical water mass. Unlike the earlier part of this lineage, the Late Miocene through Quaternary evolution is centered in the tropical areas. [Kennett & Srinivasan 1983; but reference to Globigerina (Zeaglobigierina) woodi changed to Globoturbotalita woodi]

Most likely ancestor: Globoturborotalita - at confidence level 4 (out of 5). Data source: Kennett & Srinivasan 1983.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in mid part of Piacenzian Stage (50% up, 3.1Ma, in Piacenzian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Burdigalian Stage (64% up, 17.6Ma, in Burdigalian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.204

References:

Bandy, O.L.; Ingle, J.C. & Frerichs, W.E., (1967). Isomorphism in "Sphaeroidinella" and "Sphaeroidinellopsis". Micropaleontology, 13(4): 483-488.

Banner, F.T. & Blow, W.H., (1959). The classification and stratigraphical distribution of the Globigerinaceae. Palaeontology, 2(1): 1-27.

Blow, W.H., (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In: Bronnimann, P. and Renz, H.H. (Editors), Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967, Leiden, Netherlands, pp. 380-381.

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.

Bé, A., W. H., (1965). The influence of depth on shell growth in Globigerinoides sacculifer (Brady). Micropaleontology, 11(1): 81-97.

Jenkins, D.G., (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin, 42: 1-278.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Lamb, J.L. & Beard, J.H., (1972). Late Neogene planktonic foraminifers in the Caribbean, Gulf of Mexico, and Italian stratotypes,. Kansas Univ. Paleont. Contrib., Art. 57 (Protozoa 8): 1-67.

Parker, F.L., (1967). Late Tertiary biostratigraphy (planktonic foraminifera) of tropical Indo-Pacific deep-sea cores. Bulletins of American Paleontology, 52(235): 115203.

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.

Srinivasan, M.S. & Kennett, J.P., (1981). Neogene planktonic foraminiferal biostratigraphy and evolution: equatorial to subantarctic, south Pacific. Marine Micropaleontology, 6: 499-533.

Ujiie, H., (1976). Prosphaeroidinella, n. gen.: Probable ancestral taxon of Sphaeroidinellopsis (Foraminifera),. Bulletin of the National Science Museum, Series C, 2(1): 9-26.


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Sphaeroidinellopsis compiled by the pforams@mikrotax project team viewed: 17-8-2018

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