Globigerinoides neoparawoodi


Classification: pf_cenozoic -> Globigerinidae -> Globigerinoides -> Globigerinoides neoparawoodi
Sister taxa: G. elongatus, G. extremus, G. conglobatus, G. eoconglobatus, G. obliquus, G. altiaperturus, G. joli, G. neoparawoodi, G. kennetti, G. bollii, G. italicus, G. ruber, G. mitra, G. seigliei, G. subquadratus, G. diminutus, G. bulloideus, G. sp.,

Taxonomy

Citation: Globigerinoides neoparawoodi Spezzaferri, in Spezzaferri et al. 2018
Rank: species
Synonyms:
Taxonomic discussion:

The holotype of G. parawoodi Keller is here placed in synonymy with G. italicus. However, we consider the paratype of G. parawoodi (USNM 307090) as a distinct species, and is here erected as G. neoparawoodi (Article 23 and 72.6 of the International Code of Zoological Nomenclature). Chaisson and Leckie (1993) considered forms very similar to G. neoparawoodi, deriving from G. woodi (and named G. parawoodi) as possible ecophenotypes of G. woodi rather than a separate species. However, since these morphologies are clearly distinguished within the variability of the genus at the beginning of its range we retain them as a separate species. [Spezzaferri et al. 2018]

Catalog entries: Globigerinoides neoparawoodi

Type images:

Distinguishing features: Subovate to subtriangular, moderately lobulate, 3½-4 globular chambers in final whorls; umbilicus open & wide; Primary aperture high circular  arch. One small supplementary sutural aperture on the spiral side (opposite the primary 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:

Globigerinoides neoparawoodi strongly differs from the holotype of G. parawoodi Keller (here considered a junior synonym of G. italicus) by having a more lobate profile and a higher arched and circular centered umbilical aperture, rather than an oblique and drop-like arch (higher than wide). It differs from G. altiaperturus by the lower arched primary and supplementary apertures and by the more lobate profile. It differs from G. bollii by its more lobate profile and wider primary aperture. It differs from G. joli n. sp. by its more compact outline and by lacking the thick rim bordering the primary aperture. It differs from T. quadrilobatus and T. primordius by its ruber/sacculifer-type wall texture and by having a higher arched primary aperture bordered by a rim, which is lacking in T. quadrilobatus and tends to the peripheral margin in T. primordius. [Spezzaferri et al. 2018]


Wall type: Normal perforate, spinose, ruber/sacculifer-type wall.

Test morphology: Low to moderately high trochospiral, subovate to subtriangular and moderately lobulate in outline, globular chambers arranged in 3 whorls, increasing slowly in size, 3½-4 in the last whorl, sutures depressed, straight and radial on both sides; umbilicus open, wide, enclosed by surrounding chambers. Primary aperture an umbilical and distinct circular high arch sometimes bordered by a thin rim. One low and small arched supplementary sutural aperture on the spiral side is opposite to the primary aperture. [Spezzaferri et al. 2018]

Size: Maximum length of holotype 0.30 mm, maximum width 0.26 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:Sutural
spiral sutures:Strongly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.5-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Cosmopolitan but more abundant at low latitudes (Keller, 1981; Spezzaferri, 1994). [Spezzaferri et al. 2018]

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

Phylogenetic relations: Globigerinoides neoparawoodi n. sp. evolved from G. woodi in the upper part of Subzone M1a. [Spezzaferri et al. 2018]

Most likely ancestor: Globoturborotalita woodi - at confidence level 3 (out of 5). Data source: Spezzaferri et al. 2018.
Likely descendants: Globigerinoides italicus; Globigerinoides joli;

Biostratigraphic distribution

Geological Range:
Notes: Globigerinoides neoparawoodi n. sp. ranges from the upper part of Subzone M1a to Zone M6 (Norris, 1998). [Spezzaferri et al. 2018]
Last occurrence (top): within M6 zone (14.24-15.10Ma, top in Langhian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within M1a subzone (22.44-22.96Ma, base in Aquitanian stage). Data source: Spezzaferri et al. 2018

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.9 p.282

References:

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

Keller, G. (1981). Origin and evolution of the genus Globigerinoides in the Early Miocene of the northwestern Pacific, DSDP Site 292. Micropaleontology. 27(3): 293-304. gs

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. 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. (2018b). Taxonomy, biostratigraphy, and phylogeny of Oligocene to Lower Miocene Globigerinoides and Trilobatus. 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 9): 269-306. gs


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Globigerinoides neoparawoodi compiled by the pforams@mikrotax project team viewed: 18-10-2019

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