CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia miozea sphericomiozea Walters 1965
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.
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. 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.
References:
Walters, R. (1965). Walters, R. (1965). The Globorotalia zealandica and G. miozea lineages. New Zealand Journal of Geology and Geophysics. 8: 109-127. New Zealand Journal of Geology and Geophysics. 8: 109-127. gs
Globorotalia miozea sphericomiozea compiled by the pforams@mikrotax project teamviewed: 23-6-2025
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Walters 1965 pf8 N-P.JPG
Walters 1965 pf8 Q-S.JPG
Walters 1965 pf8 N-P.JPG
Walters 1965 pf8 Q-S.JPG
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