radiolaria - rads_cat - Heliodiscus linckiaformis radiolaria - rads_cat - Heliodiscus linckiaformis

CATALOG OF ORIGINAL DESCRIPTIONS: Heliodiscus linckiaformis 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 linckiaformis
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, H. trigonodon, H. trochiscus> >>

Heliodiscus linckiaformis

Citation: Heliodiscus linckiaformis Clark & Campbell 1942
taxonomic rank: species
Described on page(s) : p.40
Type specimens: pl.3, fig.13
Type repository: University of California, Museum of Paleontology, San Francisco
Family (traditional): Heliodiscidae
Family (modern): Heliodiscidae

Current identification/main database link: Astrophacus linckiaformis (Clark and Campbell) Caulet 1986


Original Description

Shell small, with five short rays dividing the shell into a bivium and trivium with the bilateral axis passing through the middle ray of the trivium as in the starfish, spines hardly twice the diameter of a pore in length, strongly four-angled, angles decurrent near the tip, distally sharp, spreadingat the base with sweepingly concave sides to the expanded base and with riblets extending into the ray; corticular shell lenticular, very strongly biconvex, with very large, fairly uniform, subcircular pores, these sometime confluent, two or three flowing together with a common rim, the pores with very thin rims, about fifteen or sixteen across a diameter and six to nine in an interradius; cavities of the pores cylindrical; surface flush, with slight points; framework clear but with thick bars; medullary shell less than 0.3 the diameter of the cortical shell, with few large, coarse pores and thick, dense framework, supporting beams twelve, thin, more or less equally distributed around the periphery.

Size:
Diameter of cortical shell, 150µm; of medullary shell, 40µm; of pores, 12.2µm; thickness of wall, 6.6µm; length of ray, 21µm.

Extra details from original publication
Distinguishing characters: Heliodiscus linckiaformis n. sp. differs from H. pentasteriscus n. sp. in smaller size (150 as against 200µm) in shorter rays (21 as against 60.6µm) and in very much larger pores (twice the diameter of those of the latter). Both species have five rays.

Editors' Notes
[The authors here list this species under the subgeneric name Heliodiscetta 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


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Heliodiscus linckiaformis compiled by the radiolaria@mikrotax project team viewed: 30-5-2024

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