radiolaria - rads_cenozoic - Calocycletta robusta radiolaria - rads_cenozoic - Calocycletta robusta

Calocycletta robusta


Classification: rads_cenozoic -> Pterocorythidae -> Calocycletta -> Calocycletta robusta
Sister taxa: C. acanthocephala, C. anekathen, C. caepa, C. cladara, C. costata, C. parva, C. robusta, C. serrata, C. virginis, C. sp.

Taxonomy

Citation: Calocycletta robusta Moore 1971
taxonomic rank: species
Basionym: Calocycletta robusta
Synonyms:
1972 Calocyletta robusta - Moore plate 10, figure 6
Taxonomic discussion: Moore 1971 p 743-744 pl 10 figs 5, 6; Moore 1995 p 211

Catalog entries: Calocycletta robusta

Original description: Stout conical apical horn which envelopes or nearly envelopes an ovate, lobed cephalis. Cephalis has very sparse subcircular pores. Thorax robust and hemispherical to subspherical in shape. Rough surface of the thorax contains circular, hexagonally arranged pores with a tendency towards longitudinal alignment. Lumbar stricture usually not marked externally (except in early forms). Abdomen tapers distally and contains subcircular pores which are strongly longitudinally aligned. Abdominal termination usually ragged, but may end in irregular lamellar and tapering feet in the later forms.
Remarks on original description: Early forms of C. robusta have a nearly hemispherical thorax, a cylindrical shape in the region of the lumbar stricture, and an abdomen that tapers distally. Later forms have a subspherical thorax that gives rise smoothly to the uniform taper of the abdomen at or slightly above the lumbar stricture.
prominent constituent of assemblages from latitudes lower than 40 degrees

Description


Published descriptions


Moore 1972 - Calocyletta robusta

Description: Stout conical apical horn which envelops or nearly envelops an ovate, lobed cephalis. Cephalis with very sparse subcircular pores. Thorax robust and hemispherical to subspherical in shape. Rough surface of the thorax pierced by circular, hexagonally arrangedpores with a tendency toward longitudinal alignment. Lumbar stricture usually not marked externally except in early forms. Abdomen tapering distally and pierced by subcircular pores which are strongly longitudinally aligned. Abdominal termination usually ragged, but may be irregular with lamellar and tapering feet in the later forms. Early forms of C. robusta (Moore, MS., pl. 7, fig. 4a) have a nearly hemispherical thorax, a cylindrical shape in the region of the lumbar stricture, and an abdomen that tapers distally. Later forms (plate 1, figure 6; Moore, MS., pl. 7, fig. 4b) have a subspherical thorax that gives rise smoothly to the uniform taper ofthe abdomen at or slightly above the lumbar stricture.


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:

References:

Moore, T. C. Jr. (1971). Radiolaria. Initial Reports of the Deep Sea Drilling Project. 8: 727-774. gs

Moore, T. C. Jr. (1972). Mid-Tertiary evolution of the radiolarian genus Calocycletta. Micropaleontology. 18(2): 144-152. gs

Moore, T. C. (1995b). Radiolarian stratigraphy, Leg 138. Proceedings of the Ocean Drilling Program, Scientific Results. 138: 191-232. gs


logo

Calocycletta robusta compiled by the radiolaria@mikrotax project team viewed: 15-4-2024

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203405 Go to Archive.is to create a permanent copy of this page - citation notes



Add Comment

* Required information
Captcha Image
Powered by Commentics

Comments

No comments yet. Be the first!