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CATALOG OF ORIGINAL DESCRIPTIONS: Calocycletta robusta Moore 1971

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: rads_cat -> C -> Calocycletta -> Calocycletta robusta
Other pages this level: C. anekathen, C. caepa, C. cladara, C. mizunamiensis, C. parva, C. robusta, C. serrata

Calocycletta robusta

Citation: Calocycletta robusta Moore 1971
Taxonomic rank: species
Described on page(s) : p.743
Type specimens: p.10 figs.5-6
Family (traditional): Pterocorythidae
Family (modern): Pterocorythidae

Current identification/main database link: Calocycletta robusta Moore 1971


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.

Size:
Based on 30 specimens. Length of apical horn 80-185 µ; of cephalis 34-48 µ; of thorax 73-144 µ; of abdomen 64-120 µ; of feet (when present) 16-48 µ. Breadth of cephalis 40-56 µ; of thorax 120-178 µ; of abdomen (distal) 64-96 µ.

Extra details from original publication
Distinguishing characters: This species is distinguished from Calocycletta parva by the heavier shell of C. robusta (particularly the abdomen), the more regular shape and arrangements of the abdominal pores and the long,
conical apical horn.

Later forms of C. robusta are distinguished from C. virginis by the presence in C. virginis of regularly spaced terminal feet that generally begin at the same level on the abdomen and are of approximately equal width and length. Hence, it is necessary to have complete specimens to distinguish between the two species. Similarly C. robusta can only be distinguished from C. serrata by the presence on the latter species of triangular terminal feet.

Phylogeny: Descendant of Calocycletta parva and ancestor of Calocycletta virginis and Calocycletta serrata.

Editors' Notes
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

References:

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

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Calocycletta robusta compiled by the radiolaria@mikrotax project team viewed: 26-1-2025

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