CATALOG OF ORIGINAL DESCRIPTIONS: Heliodiscus quadratus 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) quadratus Clark and Campbell 1942.jpg
Heliodiscus quadratus
Citation: Heliodiscus quadratus Clark & Campbell 1942taxonomic rank: speciesDescribed on page(s) : p.38Type specimens: pl.3, fig.16Type repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): HeliodiscidaeFamily (modern): Heliodiscidae
Current identification:
Original Description Shell like a sunburst with four short rays dividing the shell into practically equal quadrants, short, distinctly three-angled, angles curved, distally decurrent, tips sharp, base very widely expanded with a concave sweep; cortical shell lenticular, strongly biconvex, with small, subcircular pores with thin rims, sunken at the bottom of subhexagonal areas with very short points at the angles of the hexagons, about twenty pores across a diameter, and about twelve in an interradius, cavities of the pores cylindrical, wall thick; medullary shell about 0.3 diameter of the cortical shell with few, large circular pores and wide, dense framework, supporting beams numerous, thin. Size: Diameter of cortical shell, 180µm; of medullary shell, 52µm; of pores, 8.8µm; length of spines, 43µm; width of wall, 12.2µm; of widest part at base of spine, 32µm. Extra details from original publication Distinguishing characters:Heliodiscus quadratus n. sp, differs from the described species of the genus in having but four spines, and these are regularly disposed so as to divide the shell into quarters. 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 quadratus compiled by the radiolaria@mikrotax project teamviewed: 8-12-2024
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Heliodiscus (Heliodiscetta) quadratus Clark and Campbell 1942.jpg quadratus Clark and Campbell 1942.jpg)
Heliodiscus (Heliodiscetta) quadratus Clark and Campbell 1942.jpg
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