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Catalog entries: Globorotalia cerroazulensis cunialensis
Type images:
holotype: G. cerroazulensis cunialensis
x: G. cerroazulensis cunialensis
x: G. cerroazulensis cunialensis
x: G. cerroazulensis cunialensis
x: G. cerroazulensis cunialensisDistinguishing features: Like T. cocoaensis but more acute periphery to final chamber, and biconvex morphology.
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.
Wall type: Smooth, normal perforate; tendency to defoliate (e.g., Snyder and Waters, 1985). [Pearson et al. 2006]
Morphology: Low trochospiral, dorsoventrally strongly compressed biconvex test with 4-5 chambers in the final whorl; most specimens show imperforate keel around periphery, which can be distinctly raised; chambers appressed and embracing, wedge-shaped in ventral aspect and increasing moderately in size; final chamber distinctly acute (<40o) at periphery in edge view; dorsal sutures strongly curved, flat or raised with imperforate band; aperture a broad arch, sometimes almost circular, in extraumbilical position; umbilicus very narrow; ventral sutures moderately curved, depressed. Strong tendency for sinistral coiling. [Pearson et al. 2006]
Size: Holotype length 0.45 mm. [Pearson et al. 2006]
Character matrix
| test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical-extraumbilical |
| sp chamber shape: | Crescentic | coiling axis: | Low | periphery: | Imperforate band | aperture border: | N/A |
| umb chbr shape: | Subtriangular | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | None |
| spiral sutures: | Raised | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4.0-5.0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Geographic distribution: Cosmopolitan, possibly more restricted to tropical latitudes than T. cerroazulensis. [Pearson et al. 2006]
Aze et al. 2011 summary: Cosmopolitan; based on Pearson et al. (2006)
Isotope paleobiology: No data available [Pearson et al. 2006]
Aze et al. 2011 ecogroup 2 - Open ocean mixed-layer tropical/subtropical, without symbionts. Based on δ13C lighter than species with symbionts; also with relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): this study
Phylogenetic relations: Evolved from Turborotalia cocoaensis in the upper Eocene (Toumarkine and Bolli, 1970). [Pearson et al. 2006]
Most likely ancestor: Turborotalia cocoaensis - at confidence level 4 (out of 5). Data source: Pearson et al. (2006), fig 15.1.
Geological Range:
Notes: Upper Eocene, Zone E16, disappearing just below the Eocene/Oligocene boundary (Toumarkine and Bolli 1970; Coccioni and others, 1988). The apparent diachroneity of the first occurrence of this species is probably related to inconsistencies in recognizing it. [Pearson et al. 2006]
Last occurrence (top): in upper part of E16 zone (80% up, 34.1Ma, in Priabonian stage). Data source: Pearson et al. (2006), fig. 15.1
First occurrence (base): in lower part of E16 zone (30% up, 34.4Ma, in Priabonian stage). Data source: Pearson et al. (2006), fig. 15.1
Plot of occurrence data:
Primary source for this page: Pearson et al. 2006 - Eocene Atlas, chap. 15, p. 450
Bolli, H. M. (1970). The foraminifera of sites 23-31, leg 4. Initial Reports of the Deep Sea Drilling Project. 4: 577-643. gs Coccioni, R., Monaco, P., Monechi, S., Nocchi, M. & Parisi, G. (1988). Biostratigraphy of the Eocene-Oligocene boundary at Massignano, (Ancona, Italy). In, Premoli Silva, I., Coccioni, R. & Montanari, A. (eds) The Eocene-Oligocene Boundary in the Marche-Umbria Basin (Italy). International Subcommission on Paleogene Stratigraphy, Ancona 59-80. gs 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 V O 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 V O Snyder, S. W. & Waters, V. J. (1985). Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur Region, Deep Sea Drilling Project Leg 80. Initial Reports of the Deep Sea Drilling Project. 80: 439-472. gs Toumarkine, M. & Bolli, H. M. (1970). Evolution de Globorotalia cerroazulensis (Cole) dans l'Eocene moyen et superieur de Possagno (Italie). Revue de Micropaléontologie. 13(3): 131-145. gs Toumarkine, M. & Luterbacher, H. (1985). Paleocene and Eocene planktic foraminifera. In, Bolli, H. M., Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge Univ. Press, Cambridge 87-154. gs Toumarkine, M. (1978). Planktonic foraminiferal biostratigraphy of the Paleogene of Sites 360 to 364 and the Neogene of Sites 362A, 363 and 364 Leg 40,. Initial Reports of the Deep Sea Drilling Project. 40: 679-721. gsReferences:
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Turborotalia cunialensis compiled by the pforams@mikrotax project team viewed: 21-1-2021
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