CATALOG OF ORIGINAL DESCRIPTIONS: Heliodiscus saturnalis Clark & Campbell 1942
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Heliodiscus (Heliodiscomma) saturnalis Clark and Campbell 1942.jpg
Heliodiscus saturnalis Ruest 1892.jpg
Heliodiscus saturnalis
Citation: Heliodiscus saturnalis Clark & Campbell 1942taxonomic rank: speciesDescribed on page(s) : p.41Type specimens: pl.3, figs.9, 9aType repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): HeliodiscidaeFamily (modern): Heliodiscidae
Current identification:
Original Description Shell like a sunburst with fourteen triangular, short rays with spreading bases, more or less equal in length and equidistant, tips bluntly pointed; cortical disc smooth, 4.6 times broader than the medullary shell, with small, regular circular pores, about twenty in number in a radius, the openings of the pores flush with the surface, the funnels directed toward the center of the shell; equatorial girdle always narrow, hardly more than a rim in places, but much wider near the bases of the spines or rays, where it is strengthened by three riblets which extend out from the shell up the base of the ray; medullary shell small, globular, with five large, subhexagonal pores set into hexagonal frames across a diameter, bars thin but dense, supporting beams not numerous, thin. Size: Diameter of the cortical shell, 200µm; of the medullary shell, 43.0µm; of the pores, 6.6µm; length of rays, 47.4µm. Extra details from original publication Distinguishing characters:Heliodiscus saturnalis n. sp. differs from the other species in the obsolete equatorial girdle, which, while demonstrable, especially in some specimens, is not so clear in others. The figured specimen shows little of the girdle. Editors' Notes [Junior homonym of Heliodiscus saturnalis Rüst. The authors here list this species under the subgeneric name Heliodiscomma 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
Rüst, D (1892a). Beitrage zur Kenntnis der fossilen Radiolarien aus Gesteinen der Trias und der palaeozischen Schichten. Palaeontographica. 38: 107-192. gsO
Heliodiscus saturnalis compiled by the radiolaria@mikrotax project teamviewed: 14-12-2024
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