pforams@mikrotax - Globigerinoides conglobatus

Citation: Globigerinoides conglobatus (Brady, 1879)

Basionym: Globigerina conglobata Brady, 1879

Synonyms:

Globigerinoides canimarensis Bermudez 1960 [according to Parker 1973, Stainforth et al. 1975, and Kennett & Srinivasan 1983]
Globigerinoides gomitulus (Seguenza, 1880) [according to Mistrtta 1962, and Kennett & Srinivasan 1983]
Alloglobigerinoides conglobatus (Brady, 1879) (e.g. Loeblich & Tappan 1994)

Distinguishing features: Tightly coiled test with flattened chambers and very small umbilicus

Description

Wall type: Spinose; Cancellate [Aze 2011]

Morphology: Test large, tightly coiled, trochospiral, subglobular to subquadrate, three to three and a half chambers in the final whorl increasing very slowly in size as added; sutures distinctly depressed, almost radial; surface coarsely perforated with spines and spine bases; umbilicus narrow; primary aperture interiomarginal, umbilical , a long, low asymmetric arch bordered by a thin rim; sutural supplementary apertures, small, irregular on the spiral side. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology

Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

In modern oceans a common, warm water, species [SCOR WG138]

Isotope paleobiology: Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy ∂¹³C and relatively light ∂¹⁸O Cited sources (Aze et al. 2011 appendix S3): Keller (1985)

Phylogenetic relations: Gs. conglobatus is distinguished by its thick-walled and tightly coiled test. Specimens representing an evolutionary and morphologic transition between Gs. extremus and Gs. conglobatus resemble Gs. conglobatus canimarensis Bermudez. We concur with Parker (1973) and Stainforth et al. (1975) in treating Gs. canimarensis as a synonym of Gs. conglobatus. Following Mistretta (1962), Globigerinoides gomitulus (Seguenza, 1880) with a smaller and more compact test than Gs. conglobatus is considered a junior synonym of Gs. conglobatus. [Kennett & Srinivasan 1983]

Molecular Genotypes recognised (data from PFR² database, June 2017), one genotype only from 25 sequences. References: Darling et al. 1997; Ujiié & Lipps 2009;

Most likely ancestor: Globigerinoides ruber - at confidence level 3 (out of 5). Data source: Morard et al. (2019) - based on mol gen data. BUT note that there might be intermediate species..
Likely descendants: Globigerinoides elongatus;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): in upper part of M13b subzone (84% up, 6.5Ma, in Tortonian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Brady, H. B. (1879). Notes on some of the reticularian Rhizopoda of the "Challenger" expedition. I.- On new or little known arenaceous types. Quarterly Journal of Microscopical Science. 19: 20-63. gs

Darling, K. F., Wade, C. M., Kroon, D. & Brown, A. J. L. (1997). Planktic foraminiferal molecular evolution and their polyphyletic origins from benthic taxa. Marine Micropaleontology. 30: 251-266. gs

Keller, G. (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In, Kennett, J. P. (ed.) The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir. 163: 1-337. gs

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

Loeblich, A. & Tappan, H. (1994). Foraminifera of the Sahul shelf and Timor Sea. Cushman Foundation for Foraminiferal Research, Special Publication. 31: 1-661. gs V O

Mistretta, E. (1962). Foraminiferi planctonici del Pliocene inferiore di Altavilla Milicia (Palermo, Sicilia),. Rivista Italiana di Paleontologia e Stratigrafia. 68(1): 97-114. gs

Parker, F. L. (1973). Late Cenozoic biostratigraphy (Planktonic foraminfera) of Tropical Atlantic deep-sea sections. Revista Española de Micropaleontología. 5(2): 253-289. gs V O

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

Seguenza, G. (1880). Le foramazioni terziarie nella provincia di Reggio (Calabria),. Rendiconti. Accademia Nazionale dei Lincei, Classe. 1-466. gs V O

Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H. & Jeffords, R. M. (1975). Cenozoic planktonic foraminiferal zonation and characteristics of index forms. University of Kansas Paleontological Contributions, Articles. 62: 1-425. gs V O

Ujiié, Y. & Lipps, J. H. (2009). Cryptic diversity in planktonic foraminifera in the northwest Pacific ocean. Journal of Foraminiferal Research. 39: 145-154. gs

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low-moderate	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	Sutural
spiral sutures:	Strongly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	3.0-3.5	N.B. These characters are used for advanced search. N/A - not applicable

Globigerinoides conglobatus

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

Comments (0)

Add Comment