Catalog - Globorotalia nagappai

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia nagappai Raju 1968

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 nagappai
Other pages this level: << < G. mineacea, G. minuta, G. minutissima, G. miocenica mediterranea, G. miotumida explicationis, G. miozea, G. miozea acumarginata, G. miozea conoidea, G. miozea rifensis, G. miozea sphericomiozea, G. miroensis, G. mohleri, G. monmouthensis, 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> >>

Globorotalia nagappai

Citation: Globorotalia nagappai Raju 1968
Rank: Species
Described on page(s) : 297
Type specimens: Pl. IV, figs. 2a-c
Type sample (& lithostrat): core samples(226.5-229.5) PTK-1 well
Type age (chronostrat): G. rex zone to G.palmerae zone, Lower Eocene
Type locality: Pattukottai well No.1, Cauvery basin, South India.
Type repository: Baroda; Palaeontology Laboratory, Oil & Natural Gas Commission, Baroda, India.

Current identification:


Original Description

Test small, low trochospiral, planoconvex; equatorial periphery lobate, axial periphery angular with distinct keel, ornamented with small spines; wall calcareous, finely perforate, occasionally spinose. Chambers strongly compressed, 13-15, 5½-6 in the last whorl increasing rapidly in size. Sutures on umbilical side radial, depressed; on spiral side curved,depressed. Umbilicus shallow, wide open. Aperture a low arch with a prominent lip; in a few forms relict apertures are observed.

Size:
Largest diameter of holotype 0.35.; greatest thickness 0.08 mm.

Etymology:
in honour of the late Shri Y. Nagappa, in recognition of his work on biostratigraphy of India.

Extra details from original publication
Remarks: This species has certain similarities with G. lehneri Cushman & Jarvis. It differs from the latter in being smaller in size; it has 5-6 chambers in the last whorl while G. lehneri has 6-7 chambers. Moreover, G. lehneri is known from Middle Eocene only. It differs from G. planoconica Subbotina in having well separated chambers. Rare forms morphologically transitional to G. nagappai and G. palmerae are found in the lower part of G. palmerae zone of PTK-1.

Editors' Notes

References:

Raju, D. S. N. (1968). Eocene-Oligocene planktonic foraminiferal biostratigraphy of Cauvery Basin, South India. Memoir of the Geological Society of India. 2: 286-299. gs


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

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