Catalog - Globorotalia (Hirsutella) scitula planaria Catalog - Globorotalia (Hirsutella) scitula planaria

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia (Hirsutella) scitula planaria 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 (Hirsutella) -> Globorotalia (Hirsutella) scitula planaria
Other pages this level: G. (Hirsutella) eleonorae, G. (Hirsutella) scitula planaria, G. (Hirsutella) theyeri

Globorotalia (Hirsutella) scitula planaria

Citation: Globorotalia (Hirsutella) scitula planaria Belford 1984
taxonomic rank: sub-species
Type specimens: Holotype (CPC 22043) and paratypes A and B (CPC 22044 and 22045)
Type age (chronostrat): Late Miocene; not older than planktonic zone N.17.
Type locality: sample F.421, Kindan section. locality 100, Wabag 1:250000 Sheet area, Papua New Guinea
Type repository: Canberra, Australia; Commonwealth Palaeontological Collection

Current identification:


Original Description

Diagnosis: A subspecies of the G. (H.) scitula group characterised by a flat dorsal surface.

Description: Test trochospiral, tightly coiled. umbilicus small, shallow; chambers increasing slowly in size, arranged in 2½ to 3 whorls, five chambers visible from ventral side. PIano-convex, dorsal surface flat, ventral surface convex. Circular to oval in outline, equatorial periphery lobate. axial periphery of early chambers broadly rounded, on later chambers narrowly rounded; no peripheral keel or imperforate peripheral band developed. Sutures on dorsal side depressed, curved, meeting periphery at angle of about 45° on ventral side, depressed. straight, radial. Surface of test finely perforate, small pustules developed on early chambers of last whorl on ventral side, particularly at umbilical margins. Aperture interiomarginal, umbilical-extra- umbilical. extending to small re-entrant near periphery, with narrow, elongate lip.

Size:
Holotype max diam 0.35mm

Etymology:
From the Latin planarius, even, flat, referring to the flat dorsal surface.

Extra details from original publication
Remarks: G. (H.) scitula planaria subsp. nov. is considered to be referable to the G. (H.) scitula group, particularly in the nature of the coiling and the dorsal chamber shape. It differs from G. (H.) scitula scitula in the pIano-convex rather than biconvex test. and in having a relatively smaller last chamber. G. (H.) scitula ventriosa Ogniben, 1958 has a flat or only slightly convex dorsal surface, but has a highly convex ventral surface and broadly rounded axial periphery. The specimens figured by Verdenius (1970) as Globorotalia scitula ventriosa from the Late Miocene of the western Guadalquivir Basin are much less convex dorsally than the type specimens of this species and have a narrower axial periphery. They are very similar to G. (H.) scitula planaria subsp. nov., and may be referable to this subspecies.

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 (Hirsutella) scitula planaria compiled by the pforams@mikrotax project team viewed: 11-9-2024

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