radiolaria - rads_cat - Heliodiscus perplexus radiolaria - rads_cat - Heliodiscus perplexus

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.

Higher levels: rads_cat -> H -> Heliodiscus -> Heliodiscus perplexus
Other pages this level: << < H. charlestonensis, H. cingillium brevispina, H. cingillum, H. cingillum brevispina, H. echiniscus, H. glyphodon, H. grottensis, H. heliasteriscus, H. hexasteriscus, H. inca, H. lentis, H. linckiaformis, H. marginatus, H. ninae, H. pentasteriscus, H. perplexus, H. pertusus, H. polymorphus, H. quadratus, H. saturnalis, H. saturnalis [junior homonym], H. saturnalis jh, H. siculus, H. solaster, H. sulcatus, H. trigonodon, H. trochiscus, H. tunicatus, H. zoroaster, H. furcatus, H. setosus

Heliodiscus perplexus

Citation: Heliodiscus perplexus Clark & Campbell 1942
taxonomic rank: species
Described on page(s) : p.40
Type specimens: pl.3, fig.12
Type repository: University of California, Museum of Paleontology, San Francisco
Family (traditional): Heliodiscidae
Family (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.

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.


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 team viewed: 19-6-2024

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