CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinella roeglina Spezzaferri & Coxall, in Spezzaferri et al. 2018

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globigerinella -> Globigerinella roeglina
Other pages this level: G. aberranta, G. aissana, G. alexi, G. biforaminata, G. cushmani, G. duboisi, G. escheri clavata, G. evoluta, G. evoluta evoluta, G. gottisi, G. japonica, G. liverovskae, G. megaperta, G. messinae messinae, G. messinae subcarinata, G. naguewichiensis, G. praemicra, G. pseudovoluta, G. roeglina, G. subangulata, G. tururensis, G. ultramicra, G. voluta pinguis

Globigerinella roeglina

Citation: Globigerinella roeglina Spezzaferri & Coxall, in Spezzaferri et al. 2018
Rank: Species
Type locality: Gulf of Mexico, northeast of the Campeche Escarpment.
Type age (chronostrat): upper Oligocene Zone O7
Type sample (& lithostrat): DSDP Hole 538A-2CC; foraminiferal nannofossil ooze.
Type specimens: Holotype (32501), and paratypes (32502, 32503 and 32504)
Type repository: Fribourg; Museum of Natural History of Fribourg

Current identification/main database link: Globigerinella roeglina Spezzaferri and Coxall, in Spezzaferri et al. 2018


Original Description

Type of wall: Spinose, spines are supported by spine collars, which coalesce to form ridges. Pore concentrations average 80 pores/50 μm2 test surface area and pore diameters average 1.5 μm.

Test morphology: Test low trochospiral consisting of 2 whorls, slightly tending to planispiral, lobulate in outline, chambers globular 4-5 in the last whorl, increasing rapidly in size, if present the last chamber may be either slightly radially elongated or smaller that the last chamber. Sutures are depressed, straight on both sides; the umbilicus is moderately small, open, enclosed by surrounding chambers, aperture an umbilical-extraumbilical high arch sometimes tending to move to completely extraumbilical, bordered by an imperforate and very thick rim.


Size: Maximum diameter of holotype around 0.35 mm

Etymology: Named after Fred Rögl for his outstanding contribution to micropaleontology.

Extra details from original publication

DISTINGUISHING FEATURES.— The distinctive characters of G. roeglina are the thick rim bordering the aperture and the presence of a last slightly radially elongated chamber. It differs from G. obesa by the higher arched aperture bordered by the thick rim and from G. clavaticamerata by its less developed elongated last chamber and by the thick rim bordering the aperture instead of a small lip typical of G. clavaticamerata.

DISCUSSION.— Globigerinella roeglina is here established as a new species because its typical morphology is recurrent in the investigated samples and, although generally small, it does not seem to be a juvenile form. Rather it looks like the “base” morphology from which the extreme clavate species of Quiltyella (Q. nazcaensis, and Q. clavacella) evolve. This species shows a moderate intraspecific variability, with specimens characterized by a slightly radially elongated or smaller last chamber. The species was previously identified by Spezzaferri (1994) and informally called “Protentella sp.”. It is here attributed to the genus Globigerinella because of the typical wall texture and because of its tendency to a planispiral coiling mode, even if rarely reached.

PHYLOGENETIC RELATIONSHIPS.— Probably evolved from Globigerinella obesa in the upper lower Oligocene Zone O4.

STRATIGRAPHIC RANGE.— Sporadic occurrence from lower Oligocene Zone O4 to possibly lower/mid -Miocene Zone M5 (Spezzaferri, 1994).

GEOGRAPHIC DISTRIBUTION.— Found at low latitudes in the Gulf of Mexico, tropical Indian Ocean and Paratethys sequences of Transylvania.

STABLE ISOTOPE PALEOBIOLOGY.— Unpublished data of S. Spezzaferri indicate a deep water habitat for this species.

References:

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 V O


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Globigerinella roeglina compiled by the pforams@mikrotax project team viewed: 15-5-2021

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