pforams@mikrotax - Neogloboquadrina acostaensis

Citation: Neogloboquadrina acostaensis (Blow, 1959)

Basionym: Globorotalia acostaensis Blow, 1959

Synonyms:

Globorotalia (Turborotalia) acostaensis tegillata Brönnimann & Resig, 1971 [according to Kennett & Srinivasan 1983]

Distinguishing features:
Parent taxon (Neogloboquadrina): Cancellate wall; umbilical-extraumbilical aperture:
This taxon: Like N. continuosa but 5-5½ chambers in final whorl, chambers more inflated, and a wide apertural rim or plate

Description

Test low trochospiral, equatorial periphery strongly lobulate , axial periphery rounded; chambers inflated, subspherical to ovate, 5 to 5½ in the final whorl; sutures on spiral and umbilical sides radial, depressed; surface distinctly reticulate with large circular pores and pore pits (Pl. 47, Fig. 1); umbilicus narrow , deep; aperture interiomarginal, extraumbilical-umbilical, a rather low arch with distinct rim or in the form of apertural plate covering much of the umbilicus. [Kennett & Srinivasan 1983]

Non-spinose; Cancellate [Aze 2011]

Biogeography and Palaeobiology

Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]

Isotope paleobiology: Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light ∂¹³C and relatively heavy ∂¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Pearson & Shackleton (1995)

Phylogenetic relations: N. acostaensis is distinguished from the phylogenetically unrelated form Gr. (I.) siakensis by its more inflated chambers, low aperture, and distinct apertural plate. N. acostaensis developed from N. continuosa in the earliest Late Miocene by developing more numerous and more inflated chambers in the final whorl and a wide apertural rim or plate. This species is ancestral to N. humerosa. The initial evolutionary appearance of N. acostaensis defines the base of Late Miocene Zone N16. N. acostaensis is restricted to tropical to warm subtropical areas. It seems that this form intergrades with N pachyderma in Late Miocene to early Pliocene sediments in temperate to polar areas (Srinivasan and Kennett, 1976; Kennett and Srinivasan, 1980). [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within PT1a subzone (0.61-1.88Ma, top in Ionian stage). Data source: Chaisson & Pearson (1997)
First occurrence (base): at base of M13a subzone (0% up, 9.8Ma, in Tortonian stage). Data source: Wade et al. (2011), zonal marker

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. gs

Brönnimann, P. & Resig, J. (1971). A Neogene globigerinacean biochronologic time-scale of the southwestern Pacific. Initial Reports of the Deep Sea Drilling Project. 7(2): 1235-1469. gs V O

Chaisson, W. P. & Pearson, P. N. P. (1997). Planktonic foraminifer biostratigraphy at Site 925: Middle Miocene–Pleistocene. Proceedings of the Ocean Drilling Program, Scientific Results. 154: 3-31. gs V O

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. gs

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs V O

Pearson, P. N. & Shackleton, N. J. (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results. 144: 401-410. gs V O

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

Wade, B. S., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. gs

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Globular	coiling axis:	Low	periphery:	N/A	aperture border:	-
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	5.0-5.5	N.B. These characters are used for advanced search. N/A - not applicable

Neogloboquadrina acostaensis

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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