CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia nicobarica Srinivasan & Sharma 1969
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Citation: Globorotalia nicobarica Srinivasan & Sharma 1969Taxonomic rank: speciesType specimens: holotype (tfs. 1-3), no. F/1: and one figured (tfs. 4-6 ) and four other unfigured paratypes, no. Fp/1.Type sample (& lithostrat): Sawai Bay Formation; in a highly calcareous light grey mudstone.Type age (chronostrat): Upper Miocene, Zone N. I8 (= Globorotalia (G.) tumida tumida-Sphaeroidinellopsis subdehiscens Partial-range zone) or basal N. 19 (= Sphaeroidinella dehiscens (s.s.)/Globoquadrina altispira (s.s.) Concurrent-range zone of Banner and Blow (1965))Type locality: About 180 meters cast of Passa Bridge, along the motor road, Grid Ref. 92459I2, Car Nicobar Island, Bay of Bengal.Type repository: Varanasi; the collections of the Geology Department, Banaras Hindu University, Varanasi, lndia:
Current identification:
Original Description Test free, small, low trochospiral, sinistrally coiled, the umbilical side slightly concave. equatorial periphery lobulate, axial periphery sub-angular with a very thin keel. Wall calcareous, perforate, umbilicus small, shallow, umbilical surface slightly roughened, spiral side comparatively smooth. Chambers spherical to subangular in outline; five to six in the final whorl, increasing rapidly as added. Sutures both on umbilical and spiral sides radial to slightly curved and slightly depressed. Aperture a low slit, slightly arched, with a lip, interiomarginal umbilical, extraumbilical. Size: Dimensions of holotype. length 0.28 mm.. breadth, 0.24 mm., and thickness 0.14 mm. Extra details from original publication Remarks. - Although Globorotalia nicobarica is a rare species in the late Tertiary of Car Nicobar, it can easily be distinguished from other recorded species of Globorotalia by the following features:
a. Axe-shaped triangular final chamber.
b. The final chamber is nearly twice that of the penultimate chamber.
Dextrally and sinistrally coiled specimens are equally common
References:
Srinivasan, M. S. & Sharma, V. (1969). Srinivasan, M. S. & Sharma, V. (1969). A new planktonic foraminifer from the Late Tertiary of Car Nicobar Island, Bay of Bengal. Contributions from the Cushman Foundation for Foraminiferal Research. 20(3): 100-101. Contributions from the Cushman Foundation for Foraminiferal Research. 20(3): 100-101. gs
Globorotalia nicobarica compiled by the pforams@mikrotax project teamviewed: 18-6-2025
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