radiolaria - rads_cat - Heliodiscus pentasteriscus radiolaria - rads_cat - Heliodiscus pentasteriscus

CATALOG OF ORIGINAL DESCRIPTIONS: Heliodiscus pentasteriscus 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 pentasteriscus
Other pages this level: << < 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, H. trigonodon, H. trochiscus, H. tunicatus, H. zoroaster, H. furcatus> >>

Heliodiscus pentasteriscus

Citation: Heliodiscus pentasteriscus Clark & Campbell 1942
taxonomic rank: species
Described on page(s) : p.39
Type specimens: pl.3, fig.8
Type repository: University of California, Museum of Paleontology, San Francisco
Family (traditional): Coccodiscidae
Family (modern): Coccodiscidae

Current identification:

Original Description

Shell like a starburst with five subequal rays extended from the margin of the disc, two forming a bivium, and three a trivium, the symmetry strictly pentamerous; the rays strong, thick at the spreading bases, triangular in surface view, with four equal angles. and concave interfaces, the tips simple and blunt, unbranched, the bases strengthened in some by riblets, no trace of equatorial girdle; cortical disc smooth, about four times the medullary shell in diameter, with small, regular, circular pores, about twenty in number in a radius,; the openings of the pores flush with the surface; the contracted funnel directed toward the center of the shell; medullary shell 0.82 length of ray in diameter, globular, with few, thick, and very dense bars around the subhexagonal pores which are set into strong subhexagonal frames, supporting beams obscure.

Diameter of cortical shell, 200µm; of medullary sphere, 49.6µm; of pores, 6.6µm; length of rays, 60.6µm; width of rays at base, 21.0µm.

Greek penta- + astericus -i = five star mark(s)

Extra details from original publication
Distinguishing characters: Heliodiscus pentasteriscus n. sp. has fewer rays than the other species which have been described in the subgenus to which it belongs. Only H. echiniscus Haeckel (1887) and H. pertusus Haeckel (1887) have small numbers of large rays, and both of these have many more than the Eocene species.

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 pentasteriscus compiled by the radiolaria@mikrotax project team viewed: 20-5-2024

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