CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia (Fohsella) peripheroacuta pristina Belford 1984
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Citation: Globorotalia (Fohsella) peripheroacuta pristina Belford 1984Taxonomic rank: sub-speciesType specimens: Holotype (CPC 22005), and paratypes A to C (CPC 22006 to 22008)Type age (chronostrat): Early Miocene, planktonic zone N.8.Type locality: sample F.434, Kmdan section, locality 100, Wabag 1: 250 000 Sheet area, Papua New GuineaType repository: Canberra, Australia; Commonwealth Palaeontological Collection
Current identification:
Original Description Diagnosis: A subspecies of the G. (F.) peripheroacuta group, with five chambers in the last whorl, a relatively large last chamber, and a compressed test. Description: Test trochoid, dorsal surface evolute ventral surface involute, umbilicus narrow, open; to almost circular in outline, equatorial periphery lobate, axial periphery broadly rounded in early chambers of last whorl, becoming narrowly to acutely rounded on later chambers. Dorsal slightly convex, ventral surface strongly convex. Chambers arranged in about three whorls, five chambers forming last whorl, increasing slowly and regularly in size, with last chamber forming slightly less than one-third of test. Spiral suture and dorsal intercameral sutures smooth or very slightly depressed, strongly recurved, meeting spiral suture at angle of 90°, and periphery of test at angle of about 45°; ventral sutures narrow, strongly depressed, radial. Test wall distinctly and coarsely perforate; wall of test smooth except for small pustules near aperture and near umbilical area of first two or three chambers of last whorl. Apertural face separated from remainder of chamber wall by distinct smooth angle. Aperture narrow, elongate, extending from umbIlicus to small re-entrant at periphery, with narrow strong lip. Size: Max. diameter 0.38mm Extra details from original publication Remarks: The rounded periphery of the early chambers of the last whorl, and the narrowly rounded later chambers, indicate a relationship between the present specimens and the species described by Blow & Banner ( I966) as G. (T.) peripheroacuta, and for this reason the new taxon is introduced at subspecific level. It differs from G. (T.) peripheroacuta peripheroacuta in having 5 chambers in the last whorl as against 6, in having a relatively larger last chamber, and in the more compressed test. The full range in test shape and test profile in edge view is shown by the holotype and figured paratypes. The profile of the last chamber ranges from that of the holotype, broad and with a change in curvature near the periphery, to that of paratypes C and D, smoothly sloping throughout and more compressed. Paratype C is the largest specimen found and also has the most narrowly rounded periphery, and a circular outline.
References:
Belford, D. J. (1984). Tertiary foraminifera and age of sediments, Ok Tedi-Wabag, Papua New Guinea. Australia Bureau of Mineral Resources Geology and Geophysics, Bulletin. 216: 1-52. gs
Globorotalia (Fohsella) peripheroacuta pristina compiled by the pforams@mikrotax project teamviewed: 11-5-2026
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