Catalog - Globigerinoides neoparawoodi

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Globigerinoides neoparawoodi

Citation: Globigerinoides neoparawoodi Spezzaferri, in Spezzaferri et al. 2018

Type sample (& lithostrat): DSDP Site 292/15/1, 90-94 cm

Type locality: northwestern Pacific Ocean

Type of wall: 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.

Maximum length of holotype 0.30 mm, maximum width 0.26 mm.

Named “neo” because it is a new description of a species with a typical G. woodi-derived morphology but with a supplementary aperture on the spiral side fitting the concept sometimes applied to G. parawoodi Keller. Since the holotype of G. parawoodi is placed in synonymy with G. italicus, a new name is required.

Globigerinoides parawoodi Keller 1981 (partim, not holotype):pl. 4, figs. 1-3, 9-11 [lower Miocene Zone N4, DSDP Site 292, northwestern Pacific Ocean].—Spezzaferri, 1994:pl. 13, figs. 6a-c [lower Miocene Subzone M1b, DSDP Hole 516F, South Atlantic Ocean]

DISTINGUISHING FEATURES: 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.

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.

PHYLOGENETIC RELATIONSHIPS: Globigerinoides neoparawoodi n. sp. evolved from G. woodi in the upper part of Subzone M1a.

STRATIGRAPHIC RANGE: Globigerinoides neoparawoodi n. sp. ranges from the upper part of Subzone M1a to Zone M6 (Norris, 1998).

GEOGRAPHIC DISTRIBUTION: Cosmopolitan but more abundant at low latitudes (Keller, 1981; Spezzaferri, 1994).

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

Spezzaferri, S., Olsson, R. K. & Hemleben, C. (2018c). 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

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides neoparawoodi Spezzaferri, in Spezzaferri et al. 2018

Globigerinoides neoparawoodi

References:

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