radiolaria - rads_cenozoic - Heliodiscus hexasteriscus radiolaria - rads_cenozoic - Heliodiscus hexasteriscus

Heliodiscus hexasteriscus


Classification: rads_cenozoic -> Heliodiscidae -> Heliodiscus -> Heliodiscus hexasteriscus
Sister taxa: H. asteriscus, H. echiniscus, H. hexasteriscus, H. tunicatus, H. sp.

Taxonomy

Citation: Heliodiscus hexasteriscus Clark & Campbell 1942
taxonomic rank: species
Basionym: Heliodiscus hexasteriscus

Catalog entries: Heliodiscus hexasteriscus

Original description: Shell like a sunburst with six rays of moderate length, equal in size except as broken, about half the diameter of the cortical shell in length, strongly four-angled in the lower three-fourths and rounded distally; tips bluntly pointed, the bases flaring to the disc; hyaline, and with short, backwardly directed processes or hooklets in the proximal part, these evidently the places of attachment of contractile protoplasmic myonemes; cortical shell lenticular, biconvex, with small, regular, equal circular pores, the pores with thin, raised rims or collars and with very minute, rarely bifurcate, mostly simple, sepaloid spinules, about twenty pores or more in a radius, and from five to nine around the edge on an interradius; cavity of the pores cylindrical, asymmetrically pointed toward the center of the disc, wall thick; medullary shell obscured by the extreme density of the cortical wall.
Remarks on original description: [The authors here list Heliodiscus hexasteriscus under the subgeneric name Heliodiscetta and include the subgeneric name in the species name.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:


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Heliodiscus hexasteriscus compiled by the radiolaria@mikrotax project team viewed: 15-6-2024

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204253 Go to Archive.is to create a permanent copy of this page - citation notes



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