Catalog - Globigerinoides emeisi

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Globigerinoides emeisi

Citation: Globigerinoides emeisi Bolli 1966

Type specimens: holotype 24490, paratype 24491

Type sample (& lithostrat): Kalibeng beds core 347 m of B.P.M. well Bodjonegoro-1. .

Type age (chronostrat): Globorotalia margaritae zone, Upper Miocene or ?Pliocene

Type locality: Holotype (pl. 1, figs. 11-13) and figured paratype (pl. 1, fig. 14) from core 347 m of B.P.M. well Bodjonegoro-1. Geol. map of Java, sheet 104A, coord. S 12000 m, E 5700 m from the NW corner of map. About 90 km W of Surabaia, Java.

Type repository: Basel, CH; Natural History Museum

Shape of test low trochospiral, equatorial periphery distinctly lobate (trilobate to quadrilobate); axial periphery rounded. Wall calcareous, perforate, nearly smooth. Chambers spherical, about 10 arranged in about 2½ whorls; the three chambers of the last whorl increase rapidly in size, the last chamber being of nearly the same volume as all the previous ones together. Sutures on spiral and umbilical side radial, distinctly incised. Primary aperture of last chamber very large, wider than high, interiomarginal, umbilical ; the single supplementary aperture of the last chamber of similar proportions but smaller in size than the primary aperture. The supplementary chamber of the penultimate chamber is visible on the holotype.

Largest diameter of holotype: 0.6 mm

- The species is named after Dr. J. D. Emeis of the B.I.P.M., The Hague, Holland, who has kindly encouraged this study.

Remarks: Globigerinoides emeisi, n. sp., is distinguished from Globigerinoides triloba immatura Le Boy by possessing a distinctly larger, higher and wider primary aperture. From Globigerinoides altiapertura Bolli it differs in the much wider primary and supplementary apertures of the last chamber. A specimen of Globigerinoides altiapertura from the type locality in Trinidad is figured in plate 1, figs. 1 and 2 for comparison of its apertures with those of Globigerinoides emeisi (plate 1, figs. 13 and 14). Globigerinoides emeisi differs from Globigerinoides obliquus obliquus (plate 1, figs. 18 and 19) in the more globular and not obliquely compressed final chamber.

Globigerinoides emeisi is restricted to the Globorotalia margaritae zone in Bodjonegoro-1. Globigerinoides altiapertura ranges in this section from the uppermostpart of the Globorotalia fohsi barisanensis zone into the Globorotalia mayeri zone, while Globigerinoides triloba immatura occurs throughout the examined section, i.e. from the Globigerinatella insueta zone to the Globoquadrina altispira altispira/Globorotalia crassaformis zone and higher.
Globigerinoides emeisi has the same short range in Bodjonegoro-1 as Globorotalia tumida flexuosa and occurs during an interval where planktonic Foraminifera are very rich and many species reach a considerable size. This indicates extremely favourable living conditions under which the new species has developed, probably by branching off from the Globigerinoides triloba complex or possibly from Globigerinoides obliquus s.l.

References:

Bolli, H. M. (1966). The planktonic foraminifera in well Bodonegore-l of Java. Eclogae Geologicae Helvetiae. 59: 449-465. gs O

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides emeisi Bolli 1966

Globigerinoides emeisi

References:

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