radiolaria - rads_cenozoic - Acrosphaera pseudarktios radiolaria - rads_cenozoic - Acrosphaera pseudarktios

Acrosphaera pseudarktios

Classification: rads_cenozoic -> Collosphaeridae -> Acrosphaera -> Acrosphaera pseudarktios
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 pseudarktios Caulet 1986
taxonomic rank: species
Basionym: Acrosphaera pseudarktios
1986 Acrosphaera pseudarktios - Caulet pl. 1, fig.8
Taxonomic discussion: Caulet 1986

Catalog entries: Acrosphaera pseudarktios

Original description: Shell surface smooth, spherical, with randomly arranged irregular pores of varying sizes (4--5 on a half-circumference). Two or more poreless spines up to one-third the length of the shell-diameter project outward from all pore margins. Spines forked and joined by very thin siliceous threads building an extra-cortical shell.


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"

Plot of occurrence data:


Caulet, J. (1986a). A refined radiolarian biostratigraphy for the Pleistocene of the temperate Indian Ocean. Marine Micropaleontology. 11(1-3): 217-229. gs

Missing or ambiguous references: Caulet 1986;


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

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Comments (2)

Maqsood Ur Rahman(China)

The species is reported from Late Pleistocene in IODP expiration 369 hole 1516B.

the uploaded Photo is in 40X with 10X objective.

Jeremy Young(UK)

Maqsood. Thank you for the comment - I don't seem to be able to find any uploaded image though. If you wish to you can send it direct to me using the email