CATALOG OF ORIGINAL DESCRIPTIONS: Stylosphaera hexaxyphophora pentaxyphophora Clark & Campbell 1942
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Stylosphaera (Stylosphaerella) hexaxyphophora pentaxyphophora Clark and Campbell 1942.jpg
Stylosphaera hexaxyphophora pentaxyphophora
Citation: Stylosphaera hexaxyphophora pentaxyphophora Clark & Campbell 1942Taxonomic rank: sub-speciesDescribed on page(s) : p.28Type specimens: pl.6, figs.5,7,11Type repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): ActinommidaeFamily (modern): Rhizosphaeridae
Current identification:
Original Description Shell minutely spiny, and with five elongate subequal spines all in the same plane, three at one pole and two at the other, the median one of the trivium marking the main axis of the shell if projected through the bivium, rather thin and nearly needleshaped, with sharp tips, base only three-angled, the remainder and most of the spine circular in cross section; cortical shell with about seven pores across a radius, with sepaloid projections which are extended as short, sharp spines; medullary shell about a third the diameter of the cortical one, with three to five irregular pores across a radius, thick bars, and with six supporting beams. Size: Length of spines, 160-180µm; of spinules, 13.2µm; diameter of cortical shell, 170µm; of medullary shell, 55µm; of pores, 11µm; wall thickness, 15.4µm. Extra details from original publication Distinguishing characters: This variety differs from the typical form of the species in having five instead of six spines. In other respects it is rather similar. Two other specimens than the type are illustrated in Figures 7 and 11. Figure 11 has a diameter of 160µm, and Figure 7 one of 180µm. Figure 11 represents a peculiar individual in many ways, and an inspection of the figures suggests that it may be abnormal. Editors' Notes [The authors here list this variety 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 pentaxyphophora compiled by the radiolaria@mikrotax project teamviewed: 29-4-2025
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