pforams@mikrotax - Globigerinoides altiaperturus

Citation: Globigerinoides altiaperturus Bolli, 1957

Basionym: Globigerinoides triloba altiapertura

Synonyms:

Globigerinoides triloba altiapertura Bolli, 1957:113, pl. 25, figs. 7a-c, 8 [lower Miocene Catapsydrax dissimilis zone, Cipero Fm., Trinidad].
Globigerinoides altiaperturus Bolli.—Jenkins, 1971:174, pl. 20, figs. 604-606 [lower Miocene, Hokianga South Heads Section, New Zealand].—Bolli and Saunders, 1985:192, fig. 20(10) [holotype re-illustrated].—Kennett and Srinivasan, 1983:54, pl. 10, fig. 1; pl. 11, figs. 4-6 [lowermost Miocene, Subzone N4b, DSDP Site 208, North Lord Howe Rise, South Pacific Ocean].—Borsetti and others, 1984, pl. IX, figs. 4a-c [lower Miocene, Monte Arligo Section, Italian Apennines].—Chaisson and Leckie, 1993:57, pl. 2, figs. 9, 10 [lower Miocene Zone M2-M3, ODP Site 806, Ontong Java Plateau, western equatorial Pacific Ocean].—Stewart and others, 2012, pl. 2, fig. 2a-c [lower Miocene, base of Subzone M1b, ODP Hole 925A, equatorial Atlantic Ocean].
“Globigerinoides” altiaperturus Bolli.—Spezzaferri, 1994:35, pl. 11, figs. 3a-c [lower Miocene Subzone M1b, DSDP Site 151, Gulf of Mexico], 4a-c, 5a-c [lower Miocene Zone M2, DSDP Site 151, Gulf of Mexico].

[Spezzaferri et al. 2018]

Taxonomic discussion:

The first occurrence of this species is documented just after the radiation level of Globigerinoides (Spezzaferri, 1994, 1996; Iaccarino and others, 1996) and it may represent an end member stage in the trend for the enlarging of the supplementary apertures on the spiral side. Bolli (1957) and Bolli and Saunders (1985) considered G. altiaperturus as a subspecies of T. trilobus, however it is here ranked as a species and considered separate from T. trilobus on account of the different wall texture.

[Spezzaferri et al. 2018]

Distinguishing features:
Parent taxon (Globigerinoides): Supplementary apertures, with ruber/sacculifer-type spinose wall texture
This taxon: Large, arched primary aperture and almost equally large supplementary aperture opposite it.

Description

Low trochospiral, subrectangular and lobulate in outline, chambers globular arranged in 2½ whorls, in the last whorl three to 3½ chambers increasing rapidly in size, the last chamber is equal to half of the test; sutures depressed, straight and radial in the inner whorls and slightly arched on both sides; umbilicus open and deep, enclosed by surrounding chambers. Primary aperture umbilical, a distinct and generally very rounded high arch. One very high arched supplementary sutural aperture on the spiral side opposite to the primary aperture. [Spezzaferri et al. 2018]

Normal perforate, spinose, ruber/sacculifer-type wall. [Spezzaferri et al. 2018]

Maximum diameter of holotype 0.55 mm. [Spezzaferri et al. 2018]

Biogeography and Palaeobiology

Common at mid to low latitudes, outside upwelling zones (Kennett and Srinivasan, 1983; Spezzaferri, 1994). [Spezzaferri et al. 2018]

Globigerinoides altiaperturus is a surface water dweller with lowest δ18O and highest δ13C in the assemblage where it is found (Stewart and others, 2012). [Spezzaferri et al. 2018]

Globigerinoides altiaperturus probably evolved from Globigerinoides joli n. sp. in the upper part of Subzone M1b. It gave rise to G. obliquus at the very end of Subzone M1b. [Spezzaferri et al. 2018]

Biostratigraphic distribution

Geological Range:
Notes: From Subzone M1b, just below the boundary between Zone M1/M2 (Spezzaferri, 1996; Iaccarino and others, 1996) to Zone M4 (Kennett and Srinivasan, 1983; Spezzaferri, 1994). It is a useful marker species for the lower Miocene (e.g., Kennett and Srinivasan, 1983; Bolli and Saunders, 1985). In Hole 516F in the Atlantic Ocean this species first occurs at the base of Zone M2 (= N5) (Spezzaferri, 1994; Spezzaferri and Pearson, 2009). At the Aquitanian GSSP at Lemme (Italy) the FO of G. altiaperturus is documented at 13 m, in Subchron C6AAr2r, in the upper part of Subzone M1b, just below the Subzone M1/M2 boundary (Spezzaferri, 1996; Iaccarino and others, 1996). [Spezzaferri et al. 2018] NB Wade et al. (2011) record the base of the species high in M2, this was based on Berggren et al. (1995). [editor's comment - JRY 2018]
Last occurrence (top): within M4 zone (16.38-17.54Ma, top in Burdigalian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): near top of M1b subzone (90% up, 21.3Ma, in Aquitanian stage). Data source: Recorded as additional event by Wade et al. (201) but position revised downward

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.9 p.274; Kennett & Srinivasan 1983, p.54

References:

Bolli, H. M. & Saunders, J. B. (1985). Oligocene to Holocene low latitude planktic foraminifera. In, Bolli, H. M., Saunders, J. B. & Perch-Neilsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge, UK 155-262. gs

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 97-123. gs

Borsetti, A., Loik, L. & Colantoni, P. (1984). Variazioni nella sedimentazione al passaggio glaciale postglaciale e Olocene in alcuni bacini nord-tirrenici evidenziate dal contenuto microfaunistico. Memorie della Societa Geologica Italiana. 27: 323-332. gs

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

Iaccarino, S., Borsetti, A. M. & Rögl, F. (1996). Planktonic foraminifera of the Neogene Lemme-Carrosio GSSP Section (Piedmont, Northern Italy). Giornale di Geologia. 58: 35-49. gs

Jenkins, D. G. (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin. 42: 1-278. gs

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

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

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

Spezzaferri, S. & Pearson, P. N. (2009). Distribution and ecology of Catapsydrax indianus, a new planktonic foraminifer index species for the Late Oligocene–Early Miocene. Journal of Foraminiferal Research. 39(2): 112-119. 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. (1996). The Oligocene/Miocene boundary in the Lemme Section (Piedmont Basin, Northern Italy): paleoclimatic evidence based on planktonic foraminifera. Giornale di Geologia. 58: 119-139. 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

Stewart, J. A., Wilson, P. A., Edgar, K. M., Anand, P. & R. H. , J. (2012). Geochemical assessment of the palaeoecology, ontogeny, morphotypic variability and palaeoceanographic utility of “Dentoglobigerina” venezuelana. Marine Micropaleontology. 84-85: 74-86. 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
sp chamber shape:	Globular	coiling axis:	Low-moderate	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	Sutural
spiral sutures:	Strongly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	3-3.5	N.B. These characters are used for advanced search. N/A - not applicable

Globigerinoides altiaperturus

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

Add Comment

Comments