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Globorotalia (Globoconella) incognita Walters 1965 from: Kennett, J.Srinivasan, M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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Species Globorotalia (Globoconella) incognita Walters 1965


Alternative name:
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test small, a low trochospire, tightly coiled, equatorial periphery quadrilobate, axial periphery rounded, chambers inflated four to four and a half in the final whorl, increasing rapidly in size as added; sutures on the spiral side gently curved, depressed, on umbilical side radial and depressed; surface cancellate with subhexagonal pits; aperture interiomarginal, extraumbilical-umbilical, fairly high arch bordered by a thick rim, extending farther up into the apertural face .
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (G.) incognita differs from its ancestor "Gr."nana in having a higher arched aperture. It is distinguished from its descendant Gr. (G.) zealandica by its smaller size, more strongly curved spiral sutures, and much less inflated umbilical side. Gr. (G.) incognita differs from Neogloboquadrina continuosa in exhibiting a more rapid increase in chamber size, in being more compact, and in having a higher arched aperture extending farther up onto the apertural face. Globorotalia nana pseudocontinuosa Jenkins is a junior synonym.
Synonym list:
Kennett & Srinivasan (1983):
1965 Globorotalia zealandica incognita Walters. - Walters : p.120 figs 6a-j
References:

Walters,R. (1965):
The Globorotalia zealandica and G. miozea lineages. . N. Z. J. Geol. Geophys. Vol. 8(1) p. 109-127

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Anonymous: Unedited TaxonConcept data
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