pforams@mikrotax - Streptochilus globigerum

Citation: Streptochilus globigerum (Schwager 1866)

Taxonomic discussion: Orthography: Streptochilus is a neuter name so the coreect epithet is globigerum not globigerus - see also the page on S. pristinum.

Distinguishing features:
Parent taxon (Bolivina variabilis):
This taxon: Rugose test, with globose chambers.

Description

Biogeography and Palaeobiology

Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983]

Phylogenetic relations:

Distinguished from St. tokelauae, a Pliocene-Quaternary form, by its globose chambers and distinctly rugose test surface. St. tokelauae probably evolved from St. globigerum during the Early Pliocene. St. latum Bronnimann and Resig and St. pristinum Brönnimann and Resig are closely related. [Kennett & Srinivasan 1983]

Molecular Genotypes recognised (data from PFR² database, June 2017), one genotype only from 19 sequences. References: Darling et al. 2009; Seears et al. 2012.

Biostratigraphic distribution

Geological Range:
Notes: Kennett & Srinivasan 1983 give a much earlier FAD of N14 for the species, than Resig 1989 (N17B) but they may have used a broader species concept. They also gave a LAD of N19, which is contradicted by plankton records of the species.
Last occurrence (top): Extant. Data source: present in the plankton (Darling et al. 2009)
First occurrence (base): within N17b zone (5.72-6.60Ma, base in Messinian stage). Data source: Resig 1989

References:

Darling, K. F., Thomas, E., Kasemann, S. A., Seears, H. A., Smart, C. W. & Wade, C. M. (2009). Surviving mass extinction by bridging the benthic/planktic divide. Proceedings of the National Academy of Sciences, USA. 106: 12629-12633. gs

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

Miranda-Martinez, A. Y., Carreño, A. L. & McDougall, K. (2017). The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California. Marine Micropaleontology. 132: 35-52. gs

Resig, J. M. (1989). Stratigraphic distribution of late Neogene species of the planktonic foraminifer Streptochilus in the Indo-Pacific. Micropaleontology. 35(49-62): -. gs

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

Seears, H. A., Darling, K. F. & Wade, C. M. (2012). Ecological partitioning and diversity in tropical planktonic foraminifera. BMC Evolutionary Biology. 12(54): 1-15. gs V O

test outline:	Triangular	chamber arrangement:	Biserial	edge view:	Compressed	aperture:	Interiomarginal
sp chamber shape:	Globular	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin flange
umb chbr shape:	Globular	umbilicus:	N/A	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	N/A	wall texture:	Reticulate	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	2.0-2.0	N.B. These characters are used for advanced search. N/A - not applicable

Streptochilus globigerum

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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