Citation: Globorotalia (Globorotalia) quasimiocenica Belford 1984Rank: SpeciesType specimens: Holotype (CPC 22032) and paratypes A to C (CPC 22033 to 22035)Type age (chronostrat): Late Miocene, not older than planktonic to G. (H.) scitula planaria subsp. nov., and may be zone N.17.Type locality: sample F.432, Kindan section. locality lOO. Wabag 1:250000 Sheet area, Papua New GuineaType repository: Canberra, Australia; Commonwealth Palaeontological Collection
Original Description Diagnosis: A large, moderately compressed species of Globorotalia with flat or very slightly convex dorsal surface. convex ventral surface, 6-7 chambers in the last whorl, curved. raised dorsal sutures, and narrow depressed radial ventral sutures.
Description: Test large, trochoid. dorsal surface flat or only slightly convex. ventral surface strongly convex. Outline of test circular, equatorial periphery slightly lobate. axial periphery narrow with thick imperforate keel. Chambers increasing only slowly in size, usually 7 chambers visible from ventral side. some specimens with only 6 chambers. Dorsal sutures thickened and raised near periphery, becoming smooth near spiral suture, curved and reflexed; ventral sutures narrow, depressed, straight or slightly curved, radial. Test wall finely perforate. surface of test smooth. Aperture interiomarginal, umbilical-extraumbilical, an elongate low opening, on some specimens with a narrow lip. Size: holotype max diameter 0.66mm Etymology: Prefixed by the Latin quasi, appearing as if, simulating, referring to the similarity with the species miocenica. Extra details from original publication Remarks: G. (G.) quasimiocenica sp. novo resembles G. (G.) pseudomiocenica Bolli & Bermudez, 1965 in its flat dorsal surface, but G. (G.) quasimiocenica is more compressed with more chambers per whorl. and the equatorial periphery is less lobate. G. (G.) quasimiocenica also resembles G. (G.) miocenica Palmer, 1945 in its flat dorsal surface, but is more compressed, and has a more lobate equatorial periphery. G. (G.) multicamerata Cushman & Jarvis, 1930 is a more compressed biconvex species with a more strongly developed keel.
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 (Globorotalia) quasimiocenica compiled by the pforams@mikrotax project teamviewed: 5-6-2023