Periphaena heliasteriscus

Taxonomy

Catalog entries: Heliodiscus heliasteriscus

Original description: Shell like a sunburst with 10 very short rays wider than long or about the same width as the length, their proximal regions sometimes with a few (two or three) riblets, the rays three-angled in proximal portion, the tips sharp, often curved; cortical shell over five times the diameter of the medullary shell, with small, regular, circular pores, about twenty in a radius or fewer, the pores set into shallow pits with sepaloid points prolonged as. minute spinules, an average of about ten or less in an interradius, cavity of the pores cylindrical, these cavities asymmetrical, directed toward the center of the disc; medullary shell a little greater in diameter than the length of a ray, globular, with few, thick, dense bars and subhexagonal pores set into hexagonal frames; supporting beams obscured by the density of the cortical shell, but thin.
Remarks on original description: [The authors here list this species under the subgeneric name Heliodiscetta and include the subgeneric name in the species name.

Description

Biogeography and Palaeobiology

Similar species

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:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Periphaena heliasteriscus, synonyms included - Heliodiscus heliastericus; Heliodiscus pentasteriscus; Periphaena heliasteriscus;
• See also space-time plot :: Samples map :: Parent: Periphaena

Periphaena heliasteriscus compiled by the radiolaria@mikrotax project team viewed: 16-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204955 Go to Archive.is to create a permanent copy of this page - citation notes

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