Cycladophora rosetta

Taxonomy

Catalog entries: Cycladophora rosetta

Original description: Cephalis is simple, of medium size, hemispherical. While most specimens have numerous irregularly shaped pores on the cephalis, some specimens exhibit a hyaline cephalis. There are two apical horns approximately the same length as the diameter of the cephalis. Cephalis is depressed into the upper thorax creating a fairly well developed spinal furrow. Lateral spines arc not expressed externally. Upper thorax is compressed, moderately flared and flat in outline with irregularly shaped pores. These pores are subdivided by an interior lattice creating four to six small petal-shaped or subcircular pores within the larger pore. Pores are arranged in staggered horizontal rows. Pore bars are narrow and of moderate thickness. The shell has a general spongy appearance due to the interior lattice-work of the pores. There is no obvious pore size gradient. Upper thoracic suture is smoothly shouldered. Lower thorax is equant to elongate, moderately to strongly flared, and centrally inflated. Pores in all but the last 1-2 rows are as those of the upper thorax, irregular in shape, filled with lattice, and arranged in staggered horizontal rows. The last rows of pores are open, variable in shape and medium to large in size. There is a gradual, weak pore size gradient increasing distally. The pore bars are narrow and of moderate thickness, free of ornamentation. Lower thoracic suture is sharply constricted. Abdomen or terminal segment consists of 1-2 horizontal rows of open, small to medium, irregularly shaped pores. Pore bars are moderately wide and fairly thick, free of ornamentation. There is usually a peristome present with one row of short teeth. The basal opening is closed by a plate which has numerous irregularly shaped, small pores.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Langhian Stage (13.82-15.97Ma, top in Langhian stage). Data source:
First occurrence (base): within Langhian Stage (13.82-15.97Ma, base in Langhian stage). Data source:

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
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Cycladophora

Cycladophora rosetta compiled by the radiolaria@mikrotax project team viewed: 7-2-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=206299 Go to Archive.is to create a permanent copy of this page - citation notes

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