Catalog - Subbotina droogeri

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Subbotina droogeri

Citation: Subbotina droogeri Myatliuk 1970

Type specimens: holotype, (no. 433-243) is lost; fide Tatiana Dimitrieva, Collections Curator at VNIGRI, 4/22/09

Type sample (& lithostrat): Polyanitsa Fm., 45.65 m in borehole no. 3

Type age (chronostrat): upper Oligocene (Chattian)

Type locality: Nebylov, eastern Carpathians

Type repository: St. Petersburg; Micropaleontology Collections of VNIGRI, St Petersburg, Russia

Translation from the Russian. - Test biconvex, with a low, trochoid spire, rounded-square in lateral outline, sometimes slightly produced, consists of 2-2.5 whorls, in the last of which 3-3.5 well separated chambers are usually seen. In the first whorl in microspheric tests the chambers are very small, spherical, in megalospheric forms they are much larger, jutting out above the plane of the last whorl. The following cl1ambers rapidly increase in size, in outline they are rounded-triangular. ln the last whorl the chambers are cylindrically shaped on the dorsal side. The very last chamber is hemispherical, the largest of all the chambers, in volume equal to half of that of the entire test. On the ventral side the two next-to-last chambers lie in a single row and are of almost equal size. Umbilicus not discernible. Sutures depressed, weakly curved. Peripheral margin rounded, lobate owing to the roundness of the chambers. Aperture an arcuately curved opening with a lip extending from the umbilicus to the peripheral margin. Wall reticulate, finely perforate.

Fig. 3, greater diameter 0.25 mm, lesser diameter 0.19 mm, thickness 0.15 mm; fig. 4, greater diameter 0.26 mm, lesser diameter 0.19 mm, thickness 0.18 mm.

in honor of K. Drooger, who figured many tests of this species

Globigerina globularis Roemer. Drooger, 1956, Micropaleontology, vol. 2, no. 2, pl. figs. 1, 2, 7, 8.

General remarks and comparison. - Among the specimens described there are both elongated and square tests, varying in the degree of inflation of the dorsal side. The specimens in external structure are strikingly similar to the form with a marginal aperture that K. Drooger presented under the name "Globigerina globularis Roemer" from the Rupelian, Stampian, and Chattian of France and the Federal Republic of Germany. Having acquanted ourselves with the description and figure of this species in Roemer (1838, Neues Jahrb. Min. Geogn. Petref.-Kunde, p. 390, pl. 3, fig. 57a-b), where he introduced it as "G. globularis d'Orbigny" from the Tertiary of West Germany, we came to the conclusion that it differs strongly from the Recent form from the fndian Ocean and merits the status of an independent species. We have named the species in honor of K. Drooger, who figured many tests of this species. Entirely analogous. but somewhat larger tests were studied by us in the Upper Oligocene of Albania. Diameter of the Albanian specimens varies from 0.25 to 0.45 mm., thickness from 0.15 to 0.3 mm. This species is very similar to Subbotina eocaenica eocaenica (Terquem) [Globigerina eocaenica. 1882] (see Myatlyuk. 1970, op. cit. pp. 189-191), differing by its being twice as small, its upwardly curved aperture, and less compactly coiled spire.

Myatliuk (1970:196) indicated that this species is conspecific with the form identified as/referred to Globigerina globularis Roemer by Drooger (1956) (which was originally introduced by Roemer (1838) as Globigerina globularis d’Orbigny from the “Tertiary of West Germany” but not with the original form described from the Recent of the Indian Ocean). Our evaluation of the description and illustrations of Myatliuk (1970) suggest that this taxon may have been referable to, and a senior synonym of Subbotina angiporoides (Hornibrook, 1965) or S. utilisindex (Jenkins and Orr). In view of the fact that the holotype has been lost, we recommend that Subbotina droogeri Myatliuk be considered nomen dubium non conservandum. [Berggren & Wade 2018]

References:

Berggren, W. A. & Wade, B. S. (2018). Problematica. 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 20): 511-524. gs

Myatliuk, L. V. (1970). Foraminifera from the flysch deposits of the Eastern Carpathians (Cretaceous-Palaeogene). Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 282: 1-225. gs

Missing or ambiguous references: Drooger 1956; Roemer 1838;

CATALOG OF ORIGINAL DESCRIPTIONS: Subbotina droogeri Myatliuk 1970

Subbotina droogeri

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