pforams@mikrotax - Globorotaloides quadrocameratus

Citation: Globorotaloides quadrocameratus Olsson, Pearson & Huber 2006

Basionym: Globorotaloides quadrocameratus

Synonyms:

?Globigerina fringa Subbotina, 1953:62, pl. 3, fig. 3 (holotype) [Danian, Pecten horizon, Azov-Black Sea flysch, Anapa, Caucasus].—Olsson and others, 1999:29, pl. 9, figs. 7-9 [re-illustration of holotype].
?Globorotalia (Turborotalia) permicra Blow and Banner, 1962:120, pl. XII, figs. N-P [lower Oligocene Globigerina oligocaenica Zone (O1/O2), Lindi area, Tanzania].
Globorotaloides suteri Bolli.—Poore and Brabb, 1977:260, pl. 1, fig. 10, “lobate form” [upper Eocene Zone P15, San Lorenzo Fm., Two Bar Shale Mem., Santa Cruz Mountains, California]. [Not Bolli, 1957.]
Globorotaloides quadrocameratus Olsson, Pearson and Huber, 2006a:83-84, pl. 5.5, figs. 1-3, 5-7 [middle Eocene Zone E11, Guayabal Fm., Tampico, Mexico], figs. 9-11 [lower/middle Eocene Zone E7, TDP Site 2, Kilwa Masoko, Tanzania].

Taxonomic discussion:

Globorotaloides quadrocameratus is a distinctly lobate species of Globorotaloides. It intergrades with Globorotaloides suteri (Pl. 4.7, Figs. 5-8), to which it gave rise in the middle Eocene (see Catapsydrax unicavus and Globorotaloides suteri entries for history of synonymy). Globorotaloides quadrocameratus lacks a bulla. It is less common in the Oligocene than the Eocene. The relationship of Blow and Banner’s (1962) taxon Globorotalia (Turborotalia) permicra, here shown as a questionable prior synonym of G. quadrocameratus, is discussed in Pearson and Wade (2015), who conclude it is likely a juvenile and discourage its use. [Coxall & Spezzaferri 2018]

Distinguishing features:
Parent taxon (Globorotaloides): Trochospiral test, ovate to spherical chambers; final chamber often small/bulla-like; cancellate wall.
This taxon: Test, small, lobulate test, 4-4½ chambers in final whorl, final chamber directed umbilically. Sacculifer-type wall texture.

Description

Test very low trochospiral, 2-2½ whorls, lobate in outline, chambers globular; in spiral view 4 globular, slightly embracing chambers in the ultimate whorl, increasing rapidly in size, sutures moderately depressed, straight; in umbilical view 4 globular, slightly embracing chambers, increasing rapidly in size, ultimate chamber may be directed towards the umbilicus, sutures moderately depressed, straight, umbilicus small, aperture umbilical-extraumbilical a low opening bordered by narrow thickened lip; in edge view chambers globular in shape, slightly embracing (modified from Olsson and others, 2006a). [Coxall & Spezzaferri 2018]

Spinose (?). Normal perforate, coarsely cancellate, sacculifer-type, wall structure. [Coxall & Spezzaferri 2018]

Maximum diameter of holotype 0.18 mm, breadth 0.10 mm. [Coxall & Spezzaferri 2018]

Biogeography and Palaeobiology

Global, including low and mid-latitudes. Can be common in southern and northern high latitudes. Possible affinity with high productivity conditions. [Coxall & Spezzaferri 2018]

Stable isotopes suggest that Globorotaloides quadrocameratus occupied a sub-thermocline planktonic habitat similar to Catapsydrax (Coxall, unpublished data). [Coxall & Spezzaferri 2018]

The origin of Globorotaloides quadrocameratus, and therefore the genus, is uncertain. In their original description of G. quadrocameratus, Olsson and others (2006a) suggested that it evolved in the basal Eocene from Parasubbotina varianta by flattening of the coil and development of a coarsely cancellate wall. In our current analysis we find similarities between G. quadrocameratus and early Paleocene forms referred to Subbotina cancellata (see Olsson and others, 1999; pl. 9, figs. 7-9, pl. 25, fig. 7). In particular we see a strong resemblance between quadrocameratus and the holotype of ‘Globigerina fringa Subbotina, 1953’ (Olsson and others, 1999:29, pl. 9, figs. 7-9), which is quadrate, highly cancellate and laterally flattened. We therefore suggest that the ancestry of Globorotaloides lies in the Danian, and that Globigerina fringa is a questionable prior synonym of G. quadrocameratus. This requires further research that is beyond the scope of this study.

Globorotaloides quadrocameratus is closely allied to G. eovariabilis, with which it commonly occurs. The smooth/flattened inner whorl as seen in spiral view, is common to both taxa. Globorotaloides quadrocameratus gave rise to Globorotaloides eovariabilis. [Coxall & Spezzaferri 2018]

Biostratigraphic distribution

Geological Range:
Notes: Lower Eocene Zone E2 (Olsson and others, 2006a) to lower Miocene Zone M1 (upper range constrained in this study, see figured specimens and their horizons, pl. 4.7). [Coxall & Spezzaferri 2018]
Last occurrence (top): within M1 zone (21.12-22.96Ma, top in Aquitanian stage). Data source: Coxall & Spezzaferri 2018
First occurrence (base): within E2 zone (55.20-55.81Ma, base in Ypresian stage). Data source: Olsson et al. 2006

Primary source for this page: Coxall & Spezzaferri 2018 - Olig Atlas chap.4 p.101; Olsson et al. 2006 - Eocene Atlas, chap. 5, p. 83

References:

Blow, W. H. & Banner, F. T. (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In, Eames, F. E., Banner, F. T., Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 97-123. gs

Coxall, H. K. & Spezzaferri, S. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Catapsydrax, Globorotaloides, and Protentelloides. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 4): 79-124. gs

McKeel, D. R. & Lipps, J. H. (1972). Calcareous plankton from the Tertiary of Oregon. Palaeogeography Palaeoclimatology Palaeoecology. 12(1-2): 75-93. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 5): 67-110. gs O

Pearson, P. N. & Wade, B. S. (2015). Systematic taxonomy of exceptionally well-preserved planktonic foraminifera from the Eocene/Oligocene boundary of Tanzania. Cushman Foundation for Foraminiferal Research, Special Publication. 45: 1-85. gs

Poore, R. Z. & Brabb, E. E. (1977). Eocene and Oligocene planktonic foraminifera from the Upper Butano sandstone and type San Lorenzo formation, Santa Cruz Mountains, California. Journal of Foraminiferal Research. 7(4): 249-272. gs

Subbotina, N. N. (1953). Foraminiferes fossiles d'URSS Globigerinidae, Globorotaliidae, Hantkeninidae. Bureau de Recherches Geologiques et Minieres. 2239: 1-144. gs

Wade, B. S., Aljahdali, M. H., Mufrreh, Y. A., Memesh, A. M., AlSoubhi, S. A. & Zalmout, I. S. (2021). Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges. Journal of Micropalaeontology. 40: 145-161. gs O

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Globular	coiling axis:	Low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Narrow	periph margin shape:	Broadly rounded	accessory apertures:	N/A
spiral sutures:	Weakly depressed	umb depth:	Shallow	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	4-4.5	N.B. These characters are used for advanced search. N/A - not applicable

Globorotaloides quadrocameratus

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

Add Comment

Comments