Actinomma kerguelenensis

Taxonomy

Catalog entries: Actinomma kerguelenensis

Original description: Skeleton consists of four concentric spherical shells. Outermost (fourth) shell always present, thin walled with small pores of irregular size and form, more or less spiny. Cortical (third) shell with irregular, thickly-framed pores commonly polygonal. At the junction of the pore bars, there are small nodes which extend to the outer shell. Distance between the fourth and the third shells short (1/3 of the distance between the medullary and cortical shells). Medullary (second) shell thin-walled with subcircular to circular pores, almost equal in size. Surface smooth, with scattered needle-shaped by-spines. Innermost shell consists of an irregular mesh, connected to the medullary shell by thin radial beams which are strongly developed outward from the medullary shell. These radial beams are about 10-15 in number and three-bladed. Radial beams extend beyond the fourth shell as main spines. Outer length of these spines no longer than the distance between the cortical and medullary shells.

Description

Biogeography and Palaeobiology

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: Actinomma kerguelenensis, synonyms included - Actinomma kerguelenensis;
• See also space-time plot :: Samples map :: Parent: Actinomma

Actinomma kerguelenensis compiled by the radiolaria@mikrotax project team viewed: 12-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203021 Go to Archive.is to create a permanent copy of this page - citation notes

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