CATALOG OF ORIGINAL DESCRIPTIONS: Stylosphaera hexaxyphophora octaxyphophora Clark & Campbell 1942
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.
Citation: Stylosphaera hexaxyphophora octaxyphophora Clark & Campbell 1942Taxonomic rank: sub-speciesDescribed on page(s) : p.29Type specimens: pl.6, fig.12Type repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): ActinommidaeFamily (modern): Rhizosphaeridae
Current identification:
Original Description Shell globular, minutely spiny, and with eight elongate subequal spines, these approximately equidistant, all in one plane, rather thin, and presumed to be needle-like but with the bases only three-angled, the remainder of the spine being round in cross-section: cortical shell thick-walled, surface with subuniformly subcircular to oval pores, about seven or eight across a radius, with sepaloid projections extended as short, sharp, conical spinules, the pores sunken into hexagonal areas; medullary shell more than a third the diameter of the cortical one, with three to five pores of irregular shape across a radius, thick bars, and with twelve or more extremely thin, more or less subequidistant, supporting beams. Size: Diameter of cortical shell, 170µm; of medullary shell, 55µm; of pores 6.6µm; wall thickness 17.2µm; spinules length, 7µm; width of base of spines 11µm. All of the polar spines of the type specimen, as shown in the photograph, are broken off. Extra details from original publication Distinguishing characters: This subspecies differs from both the typical and S. pentaxyphophora n. var. in the number of polar spines, eight instead of six and five respectively for these other two forms of the species. There are also other differences, this subspecies having a relatively large inner sphere, smaller pores, and more supporting beams than he other two forms of the species. Editors' Notes [The authors here list this subspecies under the subgeneric name Stylosphaerella and include the subgeneric name in the species name.
References:
Clark, B. L. & Campbell, A. S. (1942a). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs
Stylosphaera hexaxyphophora octaxyphophora compiled by the radiolaria@mikrotax project teamviewed: 21-5-2025
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