Globigerinella navazuelensis


Classification: pf_cenozoic -> Globigerinidae -> Globigerinella -> Globigerinella navazuelensis
Sister taxa: G. adamsi, G. calida, G. radians, G. siphonifera, G. clavaticamerata, G. molinae, G. navazuelensis, G. obesa, G. praesiphonifera, G. pseudobesa, G. roeglina, G. megaperta, G. wagneri, G. sp.,

Taxonomy

Citation: Globigerinella navazuelensis (Molina, 1979)
Rank: species
Basionym: Protentella navazuelensis Molina 1979
Synonyms:
Taxonomic discussion:

This species is almost completely planispiral during ontogeny, although some specimens may still show the initial trochospiral coiling (Plate 6.7, Figs. 13-15). The small specimens described as Protentella affinis navazuelensis by Spezzaferri (1994) and displaying a quadrangular profile and a single aperture are probably juvenile forms of G. navazuelensis. [Spezzaferri et al. 2018]

Catalog entries: Protentella navazuelensis

Type images:

Distinguishing features: Aperture symmetrical, sometimes double arch, with a thick rim. Planispiral coiling in the last whorl; chambers globular, not elongated.

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:

Characterized by a symmetrical sometimes double arch aperture bordered by a thick rim. It differs from G. clavaticamerata by lacking the elongated last or penultimate chamber and by the planispiral coiling also in the last whorl. It differs from G. molinae by having globular chambers and lacking the slight elongation of the last chambers. [Spezzaferri et al. 2018]


Wall type: Spinose, spines are supported by spine collars which coalesce to form ridges. Pore concentrations average 100 pores/50 μm2 test surface area and pore diameters average 2 μm.

Test morphology: Test planispiral, lobulate in outline, 5-6 globular, chambers in ultimate whorl, increasing moderately in size, ultimate chamber may reduced in size, sutures depressed, straight on both sides; biumbilicate, with narrow umbilici, aperture symmetrical, bordered by a distinct rim, variable; a single or double low equatorial arch at the base of the final chamber, or double umbilical-extraumbilical apertures, opening symmetrically into the umbilici. [Spezzaferri et al. 2018]

Size: Maximum diameter of holotype 0.25 mm. [Spezzaferri et al. 2018]

Character matrix

test outline:Lobatechamber arrangement:Pseudoplanispiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Common at low latitudes especially in the Atlantic and Indian Ocean but present also in the Mediterranean. [Spezzaferri et al. 2018]

Isotope paleobiology: No data available. [Spezzaferri et al. 2018]

Phylogenetic relations: We suggest that Globigerinella navazuelensis evolved from Globigerinella praesiphonifera (Blow) in the mid- Oligocene Zone O4 by developing a more marked planispiral coiling mode and from which it differs also by more numerous chambers in the last whorl. [Spezzaferri et al. 2018]

Most likely ancestor: Globigerinella praesiphonifera - at confidence level 4 (out of 5). Data source: Spezzaferri et al. 2018.
Likely descendants: Globigerinella clavaticamerata; Globigerinella molinae;

Biostratigraphic distribution

Geological Range:
Notes: Lower Oligocene Zone O4 to lower Miocene Zone M2 (Spezzaferri, 1994). [Spezzaferri et al. 2018]
Last occurrence (top): within M2 zone (19.30-21.12Ma, top in Burdigalian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within O4 zone (28.09-29.18Ma, base in Rupelian stage). Data source: Spezzaferri et al. 2018

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.6 p.196

References:

Lipps, J. H. (1964). Miocene planktonic foraminifera from Newport Bay, California. Tulane Studies in Geology and Paleontology. 2: 109-133. gs

Molina, E. (1979). Oligoceno-Mioceno inferior por media de foraminiferos planctonicos en el sector central de las Cordilleraa Beticas Espana (Tesis doctoral). . 1-342. gs

Popescu, G. & Brotea, D. (1989). Genus Protentella (Foraminifera) in North Transylvania Oligcene. In, Petrescu, I. (ed.) The Oligocene from the Transylvanian Basin. Cluj-Napoca 255-260. gs

Premoli Silva, I. & Spezzaferri, S. (1990). Paleogene planktonic foraminifer biostratigraphy and paleoenvironmental remarks on paleogene sediments from Indian Ocean sites, Leg 115. Proceedings of the Ocean Drilling Program, Scientific Results. 115: 277-314. 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., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. 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 6): 179-214. gs

van Eijden, A. J. M. & Smit, J. (1991). Eastern Indian Ocean Cretaceous and Paleogene quantitative biostratigraphy. Proceedings of the Ocean Drilling Program, Scientific Results. 121: 77-123. gs


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Globigerinella navazuelensis compiled by the pforams@mikrotax project team viewed: 19-11-2019

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