Actinomma popofskii

Taxonomy

Catalog entries: Echinomma popofskii

Original description: Massive shell consists of three spheres. Innermost smallirregular shape. Intermediate thin-walled, with 8-9 pores on half equator; from it project (Figure 12,1) slender triagonal needles uniting it to outer sphere. Outer sphere not of exactly regular shape (Figure 12, II), has 13-15 round pores on half equator. Walls of outer sphere thick, pores often with hexagonal frames. Very slender additional spinules arising from surface of outer sphere (Figure 12, III). Additional 11-14 powerful faceted radial needles usually broken off. It is interesting that these needles are not extensions of those connecting intermediate to outer sphere but arise independently of them (Figure 12, II) on surface of third sphere. This means of connection between intermediate and outer sphere differentiates described species from foregoing and from other known species of genus Echinomma. Therefore, we consider it possible to describe it as a new species.
Remarks on original description: Common in deep sediments where it constitutes less than 1% of the radiolarian populations. This species was observed South and North of the Antarctic convergence, as well in the Indian and Pacific sectors. [from RadWorld]

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 popofskii, synonyms included - Actinomma popofski; Actinomma popofskii; Actinomma popopski; Echinomma popofskii;
• See also space-time plot :: Samples map :: Parent: Actinomma

Actinomma popofskii 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=203031 Go to Archive.is to create a permanent copy of this page - citation notes

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