Actinomma mirabile

Taxonomy

Catalog entries: Actinomma mirabile

Original description: Diagnosis. A large species of Actinomma characterized by a delicate, irregularly-shaped outer medullary shell and numerous long, simple spines projecting from the outer cortical shell.
Etymology. The trivial name is derived from the Latin word mirabilis, meaning beautiful.
Description. Skeleton consists of three or four concentric lattice shells interjoined by a dense array of slender, simple, chaotically distributed radial beams. The inner medullary shell is obscured by the external shells, and its structural development has not been observed. The outer medullary lattice shell is small, well-defined, irregular in outline, and composed of a delicate trellise of fine lattice bars. The single or paired cortical lattice shells are massive, spherical, densely perforated by small, round to ovate pores distributed in no obvious geometric pattern. The diameters of the three inner lattice shells have the approximate ratio of 1:4:12. Radial beams penetrate the cortical shell wall and project from the surface as round, simple spines with blunt tips, which may have lengths approximately equal to the inner cortical shell diameter.
Remarks. Short-spined specimens of A. mirabile resemble incompletely developed specimens of Actinomma holtedahli, but they are distinguished by the structure of the outer medullary lattice shell.
Occurrences. Actinomma mirabile occurs in the Pseudodictyophimus horrida Zone from Samples 104-642B-20H-7, 24-26 cm to -21H-1, 24-26 cm and from Samples 104-642C-21H-4, 25-27 cm to -22H-1, 75- 77 cm. The species occurs discontinuously from the Ceratocyrtis broeggeri Zone to the P. horrida Zone in the interval 104-643A-14H-CC to 12H-6, 105-107 cm.
Size. 164-181 µm, maximum diameter of the inner cortical shell.
Holotype. PMO 117.577; Sample 104-642B-20H-7, 25-27 cm; England Finder M9/2; PL 2, Figs. 1-3.

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

Actinomma mirabile compiled by the radiolaria@mikrotax project team viewed: 11-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203029 Go to Archive.is to create a permanent copy of this page - citation notes

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