Cromyechinus pycnopora

Taxonomy

Catalog entries: Cromyechinus pycnopora

Original description: Shell consists of four concentric spheres: one outer shell and three inner ones. Outer shell irregularly globular or subspherical, comparatively thin-walled, comprised of many, small, circular or subelliptical pores with polygonal pore frames, and a thorny surface with many short byspines. Some specimens possess several radial spines. Outer shell connected with third inner shell by about six primary and numerous secondary beams. Both primary and secondary beams are rod-like, and almost all beams extend outwards beyond the outer shell as radial spines and byspines. Innermost shell subspherial, thin-walled, with small circular pores with polygonal pore frames, nearly equal in size to those of the outer shell. Second inner shell irregular spherical, thin-walled with small circular pores; nearly the same in form and size. Third inner shell irregularly spherical, very small, comprised of circular or subcircular pores with polygonal pore frames. Radial spines connect outer shell through three inner shells.
Remarks on original description: The form examined here fits well with the diagnosis [of the genus]; however, it is dissimilar to the type species in radial proportion of four spheres.

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: Cromyechinus pycnopora, synonyms included - Cromyechinus pycnopora;
• See also space-time plot :: Samples map :: Parent: Cromyechinus

Cromyechinus pycnopora compiled by the radiolaria@mikrotax project team viewed: 21-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203715 Go to Archive.is to create a permanent copy of this page - citation notes

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