radiolaria - rads_cenozoic - Acrosphaera arktios radiolaria - rads_cenozoic - Acrosphaera arktios

Acrosphaera arktios

Classification: rads_cenozoic -> Collosphaeridae -> Acrosphaera -> Acrosphaera arktios
Sister taxa: A. arktios, A. australis, A. collina, A. cyrtodon, A. flammabunda, A. labrata, A. lappacea, A. mercurius, A. murrayana, A. pseudarktios, A. setosa, A. spinosa, A. transformata, A. trepanata, A. sp.


Citation: Acrosphaera arktios (Nigrini 1970)
taxonomic rank: species
Basionym: Polysolenia arktios Nigrini 1970
1970 Polysolenia arktios - Nigrini p. 175, pl. 1, figs. 4,5

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]


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:


Nigrini, C. A. (1970). Radiolarian assemblages in the North Pacific and their application to a study of Quarternary sediments in Core V 20-130. Geological Society of America, Memoir. 126: 139-175. gs


Acrosphaera arktios compiled by the radiolaria@mikrotax project team viewed: 28-2-2024

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