Catalog - Globigerinella megaperta

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Globigerinella megaperta

Citation: Globigerinella megaperta Rögl 1994

Type specimens: PL 3, Figs. 7-13; PL 4, Fig. 6; Holotype: pl.3,figs.11-13; pl.4,fig.6.- NHM Wien Inv. no. 1994/34. Paratypes : 71 specimens; average diameter 0.45 mm, ranging from 0.31 to 0.60 mm. NHMWien Inv. nos. 1994/35-36, 86-102; additional paratypes are deposited in the Cushman Collection, Smithsonian Institution, Washington, and at The Natural History Museum, London.

Type sample (& lithostrat): Lower Puchkirchen formation

Type age (chronostrat): middle Oligocene, lower Egerian

Type locality: water drill site Schallerbach-2, cuttings 350 m.

Large, low trochospiral pseudo-planispiral test, with a somewhat depressed inner coil; 5 inflated chambers in the final whorl, increasing rapidly in size as added; altogether 11 chambers in two and half whorls. The chambers of the earlier whorls are small, arranged in a streptospiral coil. The last 4 chambers open into a very large, entirely open umbilicus. The aperture of the final chamber is high and open, interiomarginal, an asymmetrical equatorial arch, bordered with a thickened rim. Wall spinose, surface flat between the pores in the last two chambers, with interpore ridges in earlier ones.

holotype: maximum diameter 0.45 mm.

named after the large,open aperture;megas=old Greek for big; apertus = Latin for open.

1987 Globigerina ciperoensis BOLLI, aberrante Formen - REISER: 109, pl. 15, figs. 12, 1

General morphology: Large test with 5 to 6 chambers in the final whorl; in some specimens aberrant sacklike chambers, broader then long, occur in a last or penultimate position. The earlier whorls are very small compared with the terminal whorl, and somewhat streptospirally coiled. The wall texture is non-cancellate spinose, surface smooth between the pores in the latest formed chambers.

Remarks : This species occurs at the same level as Globigerina wagneri n. sp. It is interesting that in both species similar aberrant chambers occur. The preservation is similar, filled with pyrite or limonite, or as casts. The accompanying fauna is the same. Globigerinella obesa (BOLLI) exhibits tighter regular coiling, globular chambers which increase in size as added, without aberrant chambers; the aperture is restricted to the final chamber.

Stratigraphic distribution: Oligocene(NP23-24), Kiscellian to lower Egerian of the Central Paratethys; in the Upper Austrian Molasse Basin it occurs in the "Bändermergel", "Rupel-Tonmergelstufe" and the Lower Puchkirchen formation. Investigated material: Drillsites in the Upper Austrian Molasse Basin (Schallerbach-2, Perwang-1, Eggerding-1, Zupfing-1); Ottenthal, Waschberg unit, Lower Austria (farmyard L. HAUER, Ottenthal no. 138, coll. F. RÖGL).

References:

Rögl, F. (1994). Globigerina ciperoensis (Foraminiferida) in the Oligocene and Miocene of the central Paratethys. Annalen des Naturhistorischen Museums in Wien. 96A: 133-159. gs

Spezzaferri, S., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. 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 6): 179-214. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinella megaperta Rögl 1994

Globigerinella megaperta

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