Catalog - Globorotalia orientalis

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia orientalis Maiya, Saito, & Sato 1976

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 -> Globorotalia -> Globorotalia orientalis
Other pages this level: << < G. multiloculata, G. munda, G. nagappai, G. nana pseudocontinuosa, G. nartanensis, G. naussi, G. neominutissima, G. nicobarica, G. nicolae, G. nicoli, G. obesa, G. occlusa, G. opima continuosa, G. opima nana, G. opima opima, G. orientalis, G. oscitans, G. palmerae, G. paniae, G. pentacamerata, G. perclara, G. perconigi, G. perforataminuta, G. pertenuis, G. petaliformis, G. planocompressa, G. planocompressa evoluta, G. planocompressa planocompressa, G. planoconica, G. planoconvexa, G. platispira> >>

Globorotalia orientalis

Citation: Globorotalia orientalis Maiya, Saito, & Sato 1976
Rank: species
Type sample (& lithostrat): Sample My 3013, lower part of the Nishiyama Formation;
Type age (chronostrat): Pleistocene
Type locality: collected along a tributary of the Toriyoshi River, approximately at latitude 37" 25' N ., longitude 138" 52' 40" E ., east of Jyoganji-machi. Nagaoka City. Niigata Prefecture; Japan
Type repository: Tokyo, Japan; National Science Museum

Current identification:


Original Description

Test free. low trochospiral. moderately biconvex. nearly flat to weakly concave on the spiral side. convex to moderately vaulted on the umbilical side. equatorial profile distinctly lobulate. broadly subrhomboidal. without carina or pseudocarina; axial periphery broadly rounded. chambers slowly increasing in size. about 11 chambers in all. arranged in two and one-half tightly coiled whorls. usually four in the final whorl. sutures of the umbilical side slightly depressed. radial to slightly curved; sutures of the spiral side depressed. nearly radial to gently curved; wall calcareous. finely perforate. with distinct pustules covering the umbilical surface of the earlier chambers; umbilicus narrow but deep; aperture interiomarginal. umbilical to extraumbilical. low-arched opening at the base of narrow but distinct apertural face. with a thickened rimlike lip extending along the apertural opening.

Size:
Holotype (plate 1, figures 5a-5c). 0.46 mm.; paratype (plate 1, figures 1 a-1 b). 0.49 mm.

Etymology:

Extra details from original publication
Remarks: This species closely resembles Globorotalia inflata praeinflata Maiya. Saito, and Sato, n, subsp ., and Globorotalia inflata inflata (d'Orbigny) in general morphology, lt is distinguished as a separate species by its low-arched aperture with a rimlike lip, subrhomboidal equatorial profile, and smaller, compact shell, it also differs from Globorotalia adamantea Saito in having more inflated chambers and in being flatter on the spiral side. This species also resembles Globorotalia miozea sphericomiozea Walters in having a lowarched aperture and a subrhomboidal equatorial profile. Our comparison of G. orientalis with topotypes of G. miozea sphericomiozea (see plate 2, figures 4a-4c), however, shows that the New Zealand species differs in having a more strongly vaulted umbilical side which gives a subtriangular axial profile and much less lobulate equatorial profile.

Occurrences: This species occurs abundantly in the lowermost part of the Nishiyama Formation of the Niigata oil field and in the lower Tentokuji Formation of the Akita oil field. Its stratigraphic range is limited to the Globigerina pachyderma (dextral)/Gioborotalia orientalis Zone.

Editors' Notes

References:

Maiya, S., Saito, T. & Sato, T. (1976). Late Cenozoic planktonic foraminiferal biostratigraphy of northwest Pacific sedimentary sequences. In, Takayanagi, Y. & Saito, T. (eds) Progress in Micropaleontology. Micropaleontology Press, New York 395-422. gs


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Globorotalia orientalis compiled by the pforams@mikrotax project team viewed: 4-12-2022

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