pforams@mikrotax - Globoturborotalita bollii

Citation: Globoturborotalita bollii (Cita & Premoli Silva 1960)

Basionym: Globigerina bollii Cita & Premoli Silva 1960

Synonyms:

1960 Globigerina bollii Cita and Premoli Silva, 1960, p. 120–125, fig. 1c, pl. XIII, figs. 1–18.
1967 Globigerina bollii Cita and Premoli Silva, 1960. Cita and Premoli Silva, p. 23, pl. 1, figs. 5a–c.
1969 ?Globigerina nilotica Viotti and Mansour, p. 443, pl. 6, figs. 5–8 (nomen dubium).
1970 ?Globigerina columbae Martinez Diaz, p. 1, Lámina 1, fig. 1c (nomen dubium).
1982 ?Globigerina cf. bollii Szczechura p. 40, figs. 8–15.
1992 ?Globoturborotalita brazieri Jenkins, 1965. Berggren, p. 644, pl. 1, fig. 4 [not Jenkins, 1965].
1998 Globigerina bollii Cita and Premoli Silva, 1960. Garecka and Olszewska, p. 717, pl. II, figs. 8a–8b.
1998 ?Globigerina bollii Cita and Premoli Silva, Peryt et al., p. 77-78, pl. 1, fig. 1, pl. 2, figs. 3–4.
2001 Globigerina bollii Cita and Premoli Silva, Foresi et al., p. 22, pl.1, figs. 22–24.
2003 Globigerina bollii Cita and Premoli Silva, 1960. 1960. 1960. Rögl and Spezzaferri, p. 10, pl. 10, fig. 15.
2005 Globigerina bollii Cita and Premoli Silva, 1960. Suciu et al., p. 458, pl. 1, fig. 7.
2012 Globigerina gnaucki Blow and Banner, 1962. Beldean et al., p. 183, pl. 3, figs. 7–8 [not Blow and Banner, 1962].
2012 ?Globigerina bollii Cita and Premoli Silva, 1960. Beldean et al., p. 184, pl. 4, fig. 7.

Globigerina nilotica and G. columbae Martinez Diaz, 1970, both described from the Mediterranean, are possible junior synonyms. They will be re-examined by the NQPFWG (Neogene & Quaternary Planktic Foram Working Group).

Taxonomic discussion: The generic reattribution is based here on the general morphology of the test, the cancellate-like wall texture in some portion of the holotype (biased by the poor fossil preservation), and the numerous similarities between this taxon and Globoturborotalita ouachitaensis and G. eolabiacrassata. The assemblage recovered at Cretaccio Section (Italy) shows a robust wall texture not of the bulloides type and verging towards the ruber or sacculifer type. [Fabbrini et al 2024]

Distinguishing features:
Parent taxon (Globoturborotalita): Trochospiral test with a single, large, open umbilical aperture. Cancellate wall. 4-4½ chambers in final whorl
This taxon: Globoturborotalita bollii can be distinguished from Globigerina falconensis in having possibly a different wall texture and the subquadrate shape. Globigerina falconensis has a slightly more lobulate outline than G. bollii. The aperture in G. falconensis is a lower arch, which is more centred on the umbilicus and bordered by a thick lip. Moreover, Globoturborotalita bollii has a more squared profile and a thinner apertural lip than G. falconensis (see also Cita et al., 1965). For all of these reasons, the synonymy suggested by Crescenti (1966) and Blow (1969) is here rejected. Globoturborotalita bollii can be distinguished from Globigerina neofalconensis (Fabbrini et al., 2023) due to its squared outline and strongly compact test and higher asymmetrical aperture, which is in contrast to the lobulate outline and well-separated chambers and the well-developed apertural lip of G. neofalconensis.[Fabbrini et al 2024]

We compare G. bollii to the other four-chambered Miocene globoturborotaliids (Table 1). It can be distinguished from G. eolabiacrassata by its greater test size (Table 1), thinner apertural lip (rather than the thick rim in G. eolabiacrassata), and apparently a more finely perforated wall texture. It diverges from G. ouachitaensis by the overall bigger test (Table 1) and the more compact outline in contrast to the peculiar petaloid morphology of G. ouachitaensis. The aperture in G. bollii is higher and the umbilicus wider. It is separated from Globoturborotalita brazieri by the diamond shape of its test, and the number of chambers in the final whorl, which in G. brazieri tends to be 3–3.5 in the umbilical view. The rate of chamber growth is also more rapid in G. brazieri than in G. bollii, determining the overall different test morphology. A reverse droplet aperture characterises G. brazieri, while an asymmetrical low umbilical aperture is present in G. bollii. Globoturborotalita woodi (Jenkins, 1960) has a flatter spiral side, lower trochospire, more sub-quadrate morphology than G. bollii, and a higher symmetrical arched aperture without a lip.[Fabbrini et al 2024]

Globoturborotalita bollii can be distinguished from G. pseudopraebulloides Olsson and Hemleben, 2018 (in Spezzaferri et al., 2018) by its more compact and subquadrate outline and the lower aperture bordered by a thin lip. The latter also displays a higher rate of chamber increase and fewer embracing chambers, giving this taxon a lobulate test. Globoturborotalita occlusa (Blow and Banner, 1962) differs from G. bollii with its lower, slit-like aperture without a lip and the extremely narrow umbilicus. Globoturborotalita rubescens (Hofker, 1956) differs from G. bollii in terms of its considerably smaller size (maximum diameter about 150 μm) and its circular high arched aperture. Globoturborotalita bollii differs from Globoturborotalita druryi (Akers, 1955) with respect to the well-developed and embracing final chamber, which is a more symmetrical umbilical aperture with a significantly thicker rim and tighter umbilicus.[Fabbrini et al 2024]

Description

Test compact and subquadrate, with a low trochospiral coiling mode and the profile poorly lobulate. The final whorl consists of four embracing spherical chambers, with the final chamber frequently smaller and slightly shifted toward the umbilicus. Straight sutures are weakly depressed and converging toward the umbilicus. Umbilical aperture is quite narrow and low bordered by a thin lip. Wall texture is difficult to determine on the holotype, with finer perforation on the last chamber. In the lateral and spiral view, the early whorls are hardly visible, thus the total number of chambers is not detectable. [Fabbrini et al 2024]

Spinose, cancellate, and ruber or sacculifer type?

Biogeography and Palaeobiology

A definitive reconstruction of the phylogeny of G. bollii is not avaialble, due to the limited specimens available and the generally poor fossil preservation of the Langhian assemblages in the Mediterranean and Paratethys. [Fabbrini et al 2024]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within chron C5ADn sub-Magnetochron (14.16-14.61Ma, top in Langhian stage). Data source: Fabbrini et al 2024
First occurrence (base): within chron C5Br sub-Magnetochron (15.16-15.97Ma, base in Langhian stage). Data source: Fabbrini et al 2024

References:

Beldean, C., Filipescu, S. & Bălc, R. (2012). P and biostratigraphic data for the early Miocene of the north-western Transylvanian basin based on planktoqnic foraminifera. Carpathian Journal of Earth and Environmental Sciences. 7: 171-184. gs

Berggren, W. A. (1992). Paleogene planktonic foraminifer magnetobiostratigraphy of the southern Kerguelen Plateau (sites 747-749). Proceedings of the Ocean Drilling Program, Scientific Results. 120: 551-568. gs

Cita, M. B. & Premoli Silva, I. (1960). Globigerina bollii, nuova specie del Langhiano della Langhe. Rivista Italiana di Paleontologia e Stratigrafia. 66: 119-126. gs

Fabbrini, A., Petrizzo, M. R., Silva, I. P., Foresi, L. M. & Wade, B. S. (2024). Rediscovering Globigerina bollii Cita and Premoli Silva 1960. Journal of Micropalaeontology. 43: 121-138. gs

Foresi, L. M., Iaccarino, S., Mazzei, R., Salvatorini, G. & Bambini, A. M. (2001). Il plancton calcareo (foraminiferi e nannofossili) del Miocene delle Isole Tremiti. Paleontographia Italica. 88: 1-64. gs

Garecka, M. & Olszewska, B. (1998). Biostratigraphy of the Early Miocene of the Southern Poland based on planktic foraminifera and calcareous nannoplankton. Przeglad Geologiczny. 46: 712-721. gs

Martinez Diaz, C. (1970). Tres nuevas especies de foraminiferos en el Andaluciense. Acta Geológica Hispánica. 5: 1-3. gs

Peryt, T. M., Peryt, D., Szaran, J., Hałas, S. & Jasionowski, M. (1998). O poziomie anhydrytowym badenu w utworze wiertniczym Ryszkowa Wola 7k,Jaroslawia (SE Polska). Biuletyn Panstwowego Instytutu Geologicznego. 379: 61-78. gs

Rögl, F. & Spezzaferri, S. (2003). Foraminiferal paleoecology and biostratigraphy of the Mühlbach section (Gaindorf Formation, lower Badenian), Lower Austria. Annalen des Naturhistorischen Museums in Wien. 104: 23-75. gs O

Szczechura, J. (1982). Middle Miocene foraminiferal biochronology and ecology of SE Poland. Acta Palaeontologica Polonica. 27: 1-4. gs

Viotti, C. & Mansour, A. (1969). Tertiary planktonic foraminiferal zonation from the Nile Delta, U.A.R., Part II. Globigerina nilotica, a new species of foraminifera from the Miocene of the Nile Delta. In, Said, R., Beckmann, J. P., Ghorab, M. A., El Ansary, S., Viotti, C. & Kerdany, M. T. (eds) Proceedings of the Third African Micropaleonotligical Colloquium, Cairo March 1968. National Information and Documentation Centre, Cairo 442-447. gs

Missing or ambiguous references: Cita & Premoli Silva 1967; Suciu et al. 2004;

test outline:	Subquadrate	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	Narrow	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:	Weakly depressed	final-whorl chambers:	4-4	N.B. These characters are used for advanced search. N/A - not applicable

Globoturborotalita bollii

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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