Acrosphaera arktios

Taxonomy

Catalog entries: Polysolenia arktios

Original description: Shell smooth, spherical with numerous randomly arranged, subcircular and irregular pores of varying size. Shell very spiny, one or more poreless spines up to one third the length of the shell diameter project outward from most pore margins. Spines may fork, or 2 or more spines arising from a single pore may meet at a point; they may be needle like or flat, blunt projections. Rarely, specimens with an extra cortical shell have been observed.
Remarks on original description: This species appears to be closely related to P. spinosa, but its restricted distribution in Subarctic sediment (compare Figs. 3 and 5) seems to warrant a taxonomic distinction. Intraspecific variations and the relationship between species can, of course, only be fully determined by examination of whole colonies.[comment from RadWorld database]

Description

Biogeography and Palaeobiology

Similar species

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R 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: Acrosphaera arktios, synonyms included - Polysolenia arktios; Acrosphaera arktios;
• See also space-time plot :: Samples map :: Parent: Acrosphaera

Acrosphaera arktios compiled by the radiolaria@mikrotax project team viewed: 15-5-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=202990 Go to Archive.is to create a permanent copy of this page - citation notes

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