CATALOG OF ORIGINAL DESCRIPTIONS: Heliodiscus perplexus 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 (Heliodiscomma) perplexus Clark and Campbell 1942.jpg
Heliodiscus perplexus
Citation: Heliodiscus perplexus Clark & Campbell 1942Taxonomic rank: speciesDescribed on page(s) : p.40Type specimens: pl.3, fig.12Type repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): HeliodiscidaeFamily (modern): Heliodiscidae
Current identification:
Original Description Shell like a sunburst with eighteen short rays; these have a slight tendency to be arranged in nine pairs, several stronger than others which are in a few, mere points, generally conical; all the larger ones with tips broken off, bases expanded and connected by means of a narrow, equatorial band which is, in places, lost; cortical shell very strongly biconvex, almost globular, with very small, uniform, subcircular pores, these pores with bare rims, flush with the smooth surface, about twenty across a diameter nad three to nine in an interradius; cavities of the pores cylindrical, framework hyaline; bars at least as wide as the diameter of a pore; wall thin; medullary shell strongly elliptical, with twelve pores along its major axis and ten across the minor axis, the pores subcircular, framework dense but thin; supporting beams at least twenty-two, two of them polar through the major axis of the medullary shell and form the continuation of rays, the remainder of the beams staylike. Size: Diameter of the cortical shell, 200µm; of the medullary shell, 51.8 by 40.8µm; of pores, 6.6µm; thickness of wall, 10µm. Extra details from original publication Distinguishing characters: The equatorial girdle is less evident than in H. humboldti Haeckel (1887), the rays are more irregular, and the girdle is not striped as in H. marginatus Haeckel (1887) nor is it so wide. Editors' Notes [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
Heliodiscus perplexus compiled by the radiolaria@mikrotax project teamviewed: 25-1-2025
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 perplexus Clark and Campbell 1942.jpg)
Heliodiscus (Heliodiscomma) perplexus Clark and Campbell 1942.jpg perplexus Clark and Campbell 1942.jpg)
Heliodiscus (Heliodiscomma) perplexus Clark and Campbell 1942.jpg
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