Globoturborotalita connecta


Classification: pf_cenozoic -> Globigerinidae -> Globoturborotalita -> Globoturborotalita connecta
Sister taxa: G. tenella, G. rubescens, G. decoraperta, G. apertura, G. connecta, G. druryi, G. nepenthes, G. woodi, G. cancellata, G. occlusa, G. paracancellata, G. pseudopraebulloides, G. barbula, G. bassriverensis, G. brazieri, G. eolabiacrassata, G. euapertura, G. gnaucki, G. labiacrassata, G. martini, G. ouachitaensis, G. sp.,

Taxonomy

Citation: Globoturborotalita connecta (Jenkins, 1964)
Rank: species
Basionym: Globigerina woodi connecta Jenkins, 1964
Synonyms:
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]

Catalog entries: Globigerina woodi connecta

Type images:

Distinguishing features: Like G. woodi but compact test and more highly arched aperture

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Diagnostic characters:

Globoturborotalita connecta is distinguished from all other species of Globoturborotalita by its very coarsely cancellate, low porosity test, 3-3½ chambers symmetrically arranged around the umbilicus, and very low umbilical-extraumbilical aperture.

[Spezzaferri et al. 2018]

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

Test morphology: 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]

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

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.0-3.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: 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)]

Isotope paleobiology: Stable isotope data (Spezzaferri, unpublished) suggests this species had a shallow mixed-layer habitat. [Spezzaferri et al. 2018] Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy ∂13C and relatively light ∂18O. Sources cited by Aze et al. 2011 (appendix S3): this study

Phylogenetic relations: 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

Plot of occurrence data:

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 Palaentologists Memoirs, Geological Society of Australia. 22: 1-142. gs

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. (2018c). 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


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Globoturborotalita connecta compiled by the pforams@mikrotax project team viewed: 22-10-2019

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