Citation: Globorotalia miozea sphericomiozea Walters 1965Rank: sub-speciesType specimens: Holotype: (Fig. 8, N-P) Register No. TF 1490.
Type sample (& lithostrat): sample GRW 100Type age (chronostrat): high Tongaporutuan-KapiteanType locality: A left-bank tributary of the Waimata River, Sheet N98/2, grid ref. 420525, approximately 9 miles north of Gisborne, N.Z.
Type repository: Lower Hutt; N.Z Geological Survey foraminiferal collections
Original Description Test relatively small, a low trochospire consisting of 2½-3 whorls of slowly enlarging chambers, with 4-4½ (usually 4) in the last whorl; equatorial profile subcircular, equatorial periphery faintly lobate, dorsal surface gently convex, ventral side inflated, subconical; axial periphery bluntly rounded and somewhat thickened on earlier chambers, more angular on later chambers; wall fairly thick, becoming secondarily thickened on the chambers of the last formed whorl, especially on the periphery and ventral side; punctation fairly fine on the later chambers, becoming coarser on the thickened, somewhat rugose, ventral side of the earliest chambers of the last whorl; dorsally, chambers about twice as long as broad, separated by tangential, moderately curved sutures, sometimes slightly depressed between later chambers but forming irregular grooves in the thickened wall of earlier chambers; umbilicus very narrow or closed, aperture a low slit along the base of the apertural face, extending from the umbilical area almost to the periphery; septal foramen a low slit at the base of the septal face, becoming slightly higher at its peripheral end; a small, finely punctate, final chamberlet is often present. Size: Holotype maximum diameter = 0.32 mm; height = 0.21 mm. Etymology: Extra details from original publication Remarks: This stratigraphically restricted species is distinguished by its small, compact test and its inflated, subconical ventral side. By a reduction in the number of chambers in the last whorl, and an increase in length and degree of inflation of the chambers (Fig. 8. Q-s), this subspecies appears to evolve, at the top of the Tongaporutuan-Kapitean, into the form referred to in New Zealand as G. inflata (d'Orbigny).
Stratigraphic Range: From near the top of the Tongaporutuan-Kapitean up into the basal part of the Opoitian Stage. Editors' Notes
Walters, R. (1965). The Globorotalia zealandica and G. miozea lineages. New Zealand Journal of Geology and Geophysics. 8: 109-127. gsVO
Globorotalia miozea sphericomiozea compiled by the pforams@mikrotax project teamviewed: 4-12-2022