CATALOG OF ORIGINAL DESCRIPTIONS: Guembelina midwayensis var. nammalensis Haque 1956
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Citation: Guembelina midwayensis var. nammalensis Haque 1956Taxonomic rank: varietyType sample (& lithostrat): lower part of the Laki series, lower part of the Nammal limestone, Quinqueloculino gapperi zone; in a dark gray, fossiliferous shale.Type age (chronostrat): Lower EoceneType locality: A measured section in Nammal Gorge, Salt Range , western Pakistan. Type repository: Quetta, Pakistan; Geological Survey
Current identification:
Original Description Test small, elongate, somewhat compressed, broadest at the apertural end, rather rapidly tapering. Periphery rounded, lobulate. Chambers distinct, in the later part nearly as high as long, about seven pairs, somewhat rapidly increasing in size as added. Sutures distinct, depressed, slightly curved, usually inclined, surface smooth, sometimes very finely hispid. Wall calcareous, perforate. Aperture an arched high and broad opening at the inner margin of the last chamber with raised rim. Size: Length up to 0.23 mm.; breadth 0.13 mm.; thickness up to 0.08 mm. Extra details from original publication Differences. - This variety differs from the typical in the more inflated and narrower test, and in the comparatively smooth surface. This form differs from Guembelina cubensis Palmer in the character of the aperture and in the more elongate chambers. Guembelina midwayensis var. nammalensis differs from Guembelina garretti Howe in the smaller number of chambers, and in the smooth surface. In Guembelina garretti the surface of the initial chamber is striated. From Guembelina goodwini Cushman and Jarvis this variety differs in the narrower test and in the wider apertures . Guembelina reussi Cushman has a wider and longer test, with globose chambers.
References:
Haque, A. F. M. M. (1956). The smaller foraminifera of the Ranikot and the Laki of the Nammal gorge, Salt Range. Memoir of the Pakistan Geological Survey. 1: 1-300. gs
Guembelina midwayensis nammalensis compiled by the pforams@mikrotax project teamviewed: 17-11-2025
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