radiolaria - rads_cat - Heliodiscus inca radiolaria - rads_cat - Heliodiscus inca

CATALOG OF ORIGINAL DESCRIPTIONS: Heliodiscus inca 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 inca
Other pages this level: H. apollinis, H. asteriscoides, H. asteriscus, 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> >>

Heliodiscus inca

Citation: Heliodiscus inca Clark & Campbell 1942
taxonomic rank: species
Described on page(s) : p.38
Type specimens: pl.3, fig.17
Type repository: University of California, Museum of Paleontology, San Francisco
Family (traditional): Heliodiscidae
Family (modern): Heliodiscidae

Current identification/main database link: Astrophacus inca (Clark and Campbell 1942)

Original Description

Shell like a sunburst with nine very long conical rays (in one specimen eight), about four times longer than the basal diameter, tips sharp, round in cross section, mostly equidistant; cortical shell lenticular, strongly biconvex, with small circular pores sunken below elevated concave rims with sepaloid points, these points rarely bifurcated distally and giving to the shell a thorny appearance, the points breaking the continuity of the edge, about fifteen or more pores across a diameter and three to five or more in the interradii, cavity of the pores cylindrical, and that of the surrounding calyx concave, wall thin; medullary shell small (less than 0.25 diameter of the cortical shell), extremely dense so that its structure cannot be made out clearly, supporting beams hyaline, few, apparently corresponding to the rays in number, bars of the cortical framework thin.

Diameter of the cortical shell, 180µm; of medullary shell, 43µm; of pores, 10µm; length of rays, 85µm; width of wall, 6.6µm.

Extra details from original publication
Distinguishing characters: Heliodiscus inca n. sp. has long rays, while the other species of this collection have shorter rays.

Editors' Notes
[The authors here list this species under the subgeneric name Heliodiscetta 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 inca compiled by the radiolaria@mikrotax project team viewed: 14-6-2024

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