pforams@mikrotax - Globoturborotalita connecta

Citation: Globoturborotalita connecta (Jenkins, 1964)

Basionym: Globigerina woodi connecta Jenkins, 1964

Synonyms:

Globigerina woodi connecta Jenkins, 1964:72, figs. 1a-c [lower Miocene, North Island, New Zealand].—Jenkins, 1971:157, pl. 18, figs. 545-547 [lower Miocene, North Island, New Zealand].—Jenkins, 1978:726, pl. 1, figs. 1-5 [lower Miocene, Globigerina woodi connecta Zone, DSDP Site 360, Walvis Ridge, southeastern Atlantic Ocean].—Basov and others, 1983:839, pl. 11, figs. 5-7 [lower Miocene, DSDP Site 513A, Falkland Plateau, South Atlantic Ocean].
Globigerina (Zeaglobigerina) connecta Jenkins.—Kennett and Srinivasan, 1983:44, pl. 8, figs. 1-3 [lower Miocene, Catapsydrax dissimilis Zone, DSDP Site 208, Lord Howe Rise, southwestern Pacific Ocean].
Globigerina (Globoturborotalita) woodi connecta Jenkins.—Chaproniere, 1988:129, pl. 2, figs. 6-9, 11-14 [lower Miocene, southeastern Australia].
Zeaglobigerina connecta (Jenkins).—Spezzaferri, 1994:32-33, pl. 4, figs. 4a-c [lower Miocene, Subzone N4b, ODP Hole 709C, Indian Ocean].
Globoturborotalita connecta (Jenkins).—Li and McGowran, 2000:44, fig. 20H [lower Miocene, Zone SN2, southeastern Australia].
Globigerina woodi Jenkins.—Chaisson and Leckie, 1993:156, pl. 1, fig. 15 [lower Miocene, Subzone N4b, ODP Site 806, western equatorial Pacific Ocean]. [Not Jenkins, 1960.]

Taxonomic discussion:

The first appearance of this species marks the base of the lower Miocene G. woodi Zone in Australia and New Zealand, although Spezzaferri (1994) documented a few specimens of G. connecta in DSDP Holes 588C and 593 (Tasman Sea) from the upper Zone P22 (= Zone O7). Spezzaferri (1994) also recorded some specimens of G. connecta from Zone P22 at high latitudes in the North Atlantic Ocean. Jenkins (1964) identified Globoturborotalita woodi as the ancestor of G. connecta and the evolution to be synchronous in New Zealand and southeast Australia. [Spezzaferri et al. 2018]

Distinguishing features:
Parent taxon (Globoturborotalita): Trochospiral test with a single, large, open umbilical aperture. Cancellate wall. 4-4½ chambers in final whorl
This taxon: Like G. woodi but compact test and more highly arched aperture

Description

Very low trochospiral, consisting of 2-2 ½ whorls, trilobate to quadrangular, compact in profile, chambers subglobular to trapezoidal; in spiral view 3-3½ subglobular strongly embracing chambers in ultimate whorl, increasing slowly in size, sutures depressed, straight; in umbilical view 3 subglobular, embracing chambers, increasing slowly in size, sutures depressed, straight, umbilicus small, aperture umbilical to extraumbilical, a very low arch, bordered by a thin rim; in edge view chambers globular. [Spezzaferri et al. 2018]

Coarsely perforate, spinose, sacculifer-type wall texture, pore concentration between 12.5-14 pores/50 μm2 test surface area. [Spezzaferri et al. 2018]

Maximum diameter of holotype 0.34 mm. [Spezzaferri et al. 2018]

Biogeography and Palaeobiology

Although it was described from New Zealand, G. connecta is cosmopolitan and also occurs at low latitudes in the Atlantic Ocean. It is generally rare. [Spezzaferri et al. 2018] Restricted to warm sub-tropical to temperate waters. [Kennett & Srinivasan 1983] Low to middle latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

Stable isotope data (Spezzaferri, unpublished) suggests this species had a shallow mixed-layer habitat. [Spezzaferri et al. 2018]

It probably evolved from G. woodi in the late Oligocene Zone O7. [Spezzaferri et al. 2018]
G. connecta differs from G. woodi in having a compact test and a more highly arched aperture. Morphologically transitional forms connecting these two species occur within the range of G. connecta. G. connecta evolved from G. woodi in the Gg. dehiscens Zone (Early Miocene) and is the immediate ancestor of Globigerinoides triloba. [Kennett & Srinivasan 1983]

Most likely ancestor: Globoturborotalita woodi - at confidence level 4 (out of 5). Data source: Kennett & Srinivasan 1983, fig.8; Aze et al. 2011; Spezzaferri et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: Zone O7 (Spezzaferri, 1994) to Zone M4, i.e., lower Miocene Globigerinoides trilobus Zone of Jenkins (1985). [Spezzaferri et al. 2018]
Last occurrence (top): within M4 zone (16.38-17.54Ma, top in Burdigalian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within O7 zone (22.96-25.21Ma, base in Chattian stage). Data source: Spezzaferri et al. 2018

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.240; Kennett & Srinivasan 1983, p.44

References:

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

Basov, I. A., Ciesielski, P. F., Krasheninnikov, V. A., Weaver, F. M. & Wise, S. W. (1983). Biostratigraphic and paleontologic synthesis: Deep Sea Drilling Project Leg 71, Falkland Plateau and Argentine Basin. Initial Reports of the Deep Sea Drilling Project. 71: 445-460. gs

Chaisson, W. P. & Leckie, R. M. (1993). High-resolution Neogene planktonic foraminifer biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific). Proceedings of the Ocean Drilling Program, Scientific Results. 130: 137-178. gs

Chaproniere, G. C. H. (1988). Globigerina woodi from the late Oligocene and early Miocene of southeastern Australia. Journal of Foraminiferal Research. 18: 105-115. gs

Jenkins, D. G. (1960). Planktonic foraminifera from the Lakes Entrance oil shaft, Victoria, Australia. Micropaleontology. 6: 345-371. gs

Jenkins, D. G. (1964). A new planktonic foraminiferal subspecies from the Australasian Lower Miocene. Micropaleontology. 10(1): 72-. gs

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

Jenkins, D. G. (1978). Guembelitria samwelli Jenkins, a new species from the Oligocene of the Southern Hemishere. Journal of Foraminiferal Research. 8(2): 132-137. gs

Jenkins, D. G. (1985). Southern mid-latitude Paleocene to Holocene planktic foraminifera. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 263-282. gs

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

Li, Q. & McGowran, B. (2000). Miocene foraminifera from Lakes Entrance Oil Shaft, Gippsland, southeastern Australia. Association of Australasian Palaeontologists, Memoirs. 22: 1-142. gs

Pearson, P. N., Premec-Fucek, V. & Premoli Silva, I. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Turborotalia. 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 15): 433-460. gs O

Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica. 81: 1-187. gs

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018d). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. 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 8): 231-268. 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:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	3-3.5	N.B. These characters are used for advanced search. N/A - not applicable

Globoturborotalita connecta

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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