CATALOG OF ORIGINAL DESCRIPTIONS: Heliodiscus pentasteriscus 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.
Heliodiscus (Heliodiscetta) pentasteriscus Clark and Campbell 1942.jpg
Heliodiscus pentasteriscus
Citation: Heliodiscus pentasteriscus Clark & Campbell 1942taxonomic rank: speciesDescribed on page(s) : p.39Type specimens: pl.3, fig.8Type repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): CoccodiscidaeFamily (modern): Coccodiscidae
Current identification:
Original Description Shell like a starburst with five subequal rays extended from the margin of the disc, two forming a bivium, and three a trivium, the symmetry strictly pentamerous; the rays strong, thick at the spreading bases, triangular in surface view, with four equal angles. and concave interfaces, the tips simple and blunt, unbranched, the bases strengthened in some by riblets, no trace of equatorial girdle; cortical disc smooth, about four times the medullary shell in diameter, with small, regular, circular pores, about twenty in number in a radius,; the openings of the pores flush with the surface; the contracted funnel directed toward the center of the shell; medullary shell 0.82 length of ray in diameter, globular, with few, thick, and very dense bars around the subhexagonal pores which are set into strong subhexagonal frames, supporting beams obscure. Size: Diameter of cortical shell, 200µm; of medullary sphere, 49.6µm; of pores, 6.6µm; length of rays, 60.6µm; width of rays at base, 21.0µm. Etymology: Greek penta- + astericus -i = five star mark(s) Extra details from original publication Distinguishing characters:Heliodiscus pentasteriscus n. sp. has fewer rays than the other species which have been described in the subgenus to which it belongs. Only H. echiniscus Haeckel (1887) and H. pertusus Haeckel (1887) have small numbers of large rays, and both of these have many more than the Eocene species. Editors' Notes [The authors here list this species under the subgeneric name Heliodiscetta 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
Heliodiscus pentasteriscus compiled by the radiolaria@mikrotax project teamviewed: 8-12-2024
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 pentasteriscus Clark and Campbell 1942.jpg)
Heliodiscus (Heliodiscetta) pentasteriscus Clark and Campbell 1942.jpg pentasteriscus Clark and Campbell 1942.jpg)
Heliodiscus (Heliodiscetta) pentasteriscus Clark and Campbell 1942.jpg
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