Calocyclas talwanii

Taxonomy

Catalog entries: Calocyclas talwanii

Original description: Shell divided into three segments, thick-walled, rough-surfaced. Cephalis small, spherical to subspherical, bearing a long, robust, slightly curved apical spine with a finely papillate surface. Cephalis pores very small, circular, deep-set. Collar stricture indistinct. Thorax campanulate, bearing large, circular pores deeply set in hexagonal frames. In the better-preserved specimens, the thoracic pores contain a delicate meshwork of intricate design, and a thin dorsal spine projects from the thorax. Lumbar stricture a distinct ring bearing a number of vertical channels where pores extend across it. Abdomen bearing large, deep-set, circular to elliptical pores which may also contain a siliceous network similar to that of the thoracic pores; tapering toward the open mouth.

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: Calocyclas talwanii, synonyms included - Calocyclas talwanii;
• See also space-time plot :: Samples map :: Parent: Calocyclas

Calocyclas talwanii compiled by the radiolaria@mikrotax project team viewed: 10-7-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203395 Go to Archive.is to create a permanent copy of this page - citation notes

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