Actinomma yosii

Taxonomy

Catalog entries: Actinomma yosii

Original description: Shell rather small, entirely globular, with three concentric spheres, and 12 radial spines; these spines straight, fairly short, about 0.3, the diameter of the cortical shell in length, swordlike, with three blades; cortical shell globular, with about ten to fourteen pores scross the diameter; its pores small, regular, circular, fairly uniform in size, deeply set into the thick wall, and with the hexagonal frames; surface of the shell being generally roughened with the small sepaloid points; secondary medullary shell in the ratio of about 0.3 to 1 of the cortical shell in diameter, with thin wall, and with about seven pores across the diameter, its pores small, regular, circular, uniform in size, with fairly thin bars; primary medullary shell in the ratio of about 0.15 to 1 of the cortical shell in diameter; supporting beams rodlike, thin, 12 in number, and internal extensions of the main radial spines.

Description

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:

• 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
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Actinomma

Actinomma yosii compiled by the radiolaria@mikrotax project team viewed: 20-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203035 Go to Archive.is to create a permanent copy of this page - citation notes

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