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GEOREF RECORD

A new, complex hyaline larger benthic foraminifer, Bigaella orbitoidiformis n. gen. n. sp., from the upper Bartonian-Priabonian of NW Turkey

Ercan Ozcan, Simon F. Mitchell, Johannes Pignatti, Michael D. Simmons, Ali Osman Yucel and Natalie Robinson
A new, complex hyaline larger benthic foraminifer, Bigaella orbitoidiformis n. gen. n. sp., from the upper Bartonian-Priabonian of NW Turkey
Journal of Paleontology (July 2022) 96 (4): 737-752

Abstract

The upper Bartonian-Priabonian shallow-marine deposits in the Biga Peninsula (NW Turkey) contain some hyaline larger benthic foraminifers (LBF) with a test architecture similar to 'orbitoidiform' foraminifers, but displaying some distinctive and complex morphological features that are recorded here for the first time. These coarsely porous specimens are characterized by a flat, disc-shaped, fragile, and smooth test with a layer of equatorial chambers/chamberlets, surrounded by poorly developed lateral chamberlets, never forming a discrete layer on either side of the equatorial layer. The nepionic stage is very distinctive because the bilocular embryonic apparatus is followed by a semi-rounded, notably large auxiliary chamber with a characteristic wavy outline, and consecutive cyclical chambers. The cyclical chamber arrangement is later transformed into annular cycles with numerous, complex arcuate- to cup-shaped chamberlets, as observed in equatorial sections. Bigaella orbitoidiformis Oezcan, Mitchell, Pignatti, Simmons, and Yuecel, n. gen. n. sp., is established for these specimens, and placed within the family Eoannulariidae Ferrandez-Canadell and Serra-Kiel, emended herein. The new genus occurs together with Caudriella Haman and Huddleston and Epiannularia Caudri (both originally established from the American bioprovince) and the genus Linderina Schlumberger (found both in the Tethys and the American bioprovinces), together with other typical Western Tethyan LBFs. A comparison of the new genus with the aforementioned taxa is given. UUID: http://zoobank.org/ab917e30-86d3-4bc2-8115-d17cf75f5d79.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 96
Serial Issue: 4
Title: A new, complex hyaline larger benthic foraminifer, Bigaella orbitoidiformis n. gen. n. sp., from the upper Bartonian-Priabonian of NW Turkey
Affiliation: Istanbul Technical University, Department of Geological Engineering, Istanbul, Turkey
Pages: 737-752
Published: 202207
Text Language: English
Publisher: Cambridge University Press for the Paleontological Society, Lawrence, KS, United States
References: 63
Accession Number: 2022-049152
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 1 table, geol. sketch map
N40°16'00" - N40°23'60", E26°49'60" - E26°51'00"
Secondary Affiliation: University of the West Indies, JAM, JamaicaUniversita di Roma La Sapienza, ITA, ItalyHalliburton, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202237
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