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


Alternative name:
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test relatively large, a relatively low trochospire consisting of two and one-half to three whorls of slowly enlarging chambers, four and one-half to five chambers in the final whorl; spiral side slightly convex, umbilical side highly conical; periphery bluntly rounded and thickened on early chambers, but on later chambers more sharply angled, with a narrow, cord like keel; sutures on spiral side strongly recurved, slightly raised, on umbilical side depressed, radial to slightly curved. Surface finely perforate, but earlier chambers show a progressive secondary thickening, especially on the periphery and on the umbilical surface. Umbilicus small, open;aperture interiomarginal, umbilical-extraumbilical, a low, distinct arch bordered by an indistinct rim.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (G.) conoidea differs from Gr. (G.) miozea by its much larger size, by its much more conical umbilical side, and by its tendency to develop a distinct keel. Globorotalia miotumida Jenkins may represent a thin-walled form of Gr. (G.) conoidea Walters. If so, it should have priority.
Synonym list:
Kennett & Srinivasan (1983):
1965 Globorotalia miozea conoidea Walters. - Walters : p.124 figs 8 i-m
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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