CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia (Turborotalia) variospira Belford 1984

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 (Turborotalia) -> Globorotalia (Turborotalia) variospira
Other pages this level: << < G. (Turborotalia) permicra, G. (Turborotalia) planispira, G. (Turborotalia) pliocenica, G. (Turborotalia) praecentralis, G. (Turborotalia) praeoscitans, G. (Turborotalia) pseudoimitata, G. (Turborotalia) pseudoinconstans, G. (Turborotalia) pseudokugleri, G. (Turborotalia) pseudopumilio, G. (Turborotalia) quadrilocula, G. (Turborotalia) rainwateri, G. (Turborotalia) riedeli, G. (Turborotalia) rikuchuensis, G. (Turborotalia) tosaensis tenuitheca, G. (Turborotalia) transsylvanica, G. (Turborotalia) variospira

Globorotalia (Turborotalia) variospira

Citation: Globorotalia (Turborotalia) variospira Belford 1984
Rank: Species
Type locality: WABAG Sheet area, Papua, New Guinea
Type age (chronostrat): Late Paleocene (Globorotalia (G.) pseudomenardii Zone, P.4).
Type specimens: CPC 21919
Type repository: Canberra, Australia; Commonwealth Palaeontological Collection

Current identification/main database link: Parasubbotina variospira (Belford 1984)


Original Description
Diagnosis: A large species of Globorotalia (Turborotalia) with 4 or 5 chambers visible ventrally, coiling becoming looser in the final whorl; narrow, depressed, radial dorsal and ventral sutures; wall pustulose near umbilicus, aperture umbilical, low, elongate.

Description: Test large, trochoid, consisting of about 12 chambers arranged in three whorls, usually 5 but sometimes 4 chambers visible from ventral side. Equatorial periphery lobate, axial periphery rounded. Chambers increasing only slowly in size, four chambers in penultimate whorl, coiling in most specimens then becoming looser and more open, generally with five chambers in final whorl, umbilicus wide, open, shallow. Occasional specimens with final chamber directed towards umbilicus, coiling also becoming tighter, 4-4½ chambers visible from ventral side. Sutures on both dorsal and ventral sides narrow, deeply depressed, radial. Test wall perforate, with small pustules at umbilical margin of early chambers of last whorl, otherwise finely pitted. Aperture interiomarginal, umbilical-extraumbilical, low elongate, not clearly observed.

Size: Holotype max diam 0.8mm

Etymology: From the Latin varius, changing, and spira, coil, referring to the looser coiling of the last whorl.

Extra details from original publication
Remarks: Of the observed specimens of G. (T.) variospira sp. nov., 20 are dextrally coiled and 9 sinistrally coiled. The holotype and figured paratypes show the full range of variation of the species from open coiling, five-chambered forms to the more tightly coiled four chambered forms. Globorotalia (Turborotalia) variospira is very similar to G. (T.) sp. 2 figured by Pujol & Sigal (1979), particularly the more open coiled five-chambered forms. Pujol & Sigal did not record closely coiled specimens similar to those in the PNG material. Globorotalia (T.) inconstans (Subbotina, 1953) has more chambers per whorl, and the test is more strongly pustulose. G. (T.) schaclhdagica (Khalilov, 1956) also has more chambers per whorl and is more closely coiled with a smaller umbilicus.

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


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Globorotalia (Turborotalia) variospira compiled by the pforams@mikrotax project team viewed: 25-10-2020

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