CATALOG OF ORIGINAL DESCRIPTIONS: Cypassis irregularis Nigrini 1968

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 -> Cypassis -> Cypassis irregularis
Other pages this level: C. cingulata, C. eucolpos, C. halicora, C. irregularis, C. palliata, C. puella

Cypassis irregularis

Citation: Cypassis irregularis Nigrini 1968
Rank: species
Type specimens: pl.1, figs.2a-c
Type repository: Holotype n° USNM650023 and paratype n° USNM650024, U.S. National Museum, Washington, D.C.
Described on page(s) : p.53
Family (traditional): Coccodiscidae
Family (modern): Coccodiscidae

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Current identification/main database link: Cypassis irregularis Nigrini 1968

Original Description
Cortical twin shell spiny, slightly constricted equatorially, with subcircular to subangular pores having no definite arrangement; pores variable in size, tending to be smaller equatorially. Poles of twin shell not closed by a definite lattice, always spiny. In some specimens these spines support an irregular, usually incomplete, spongy meshwork. When complete, this meshwork forms an ellipsoidal shell around the cortical shell. Polar caps have not been observed.
Outer medullary shell ellipsoidal, connected to an inner, spherical medullary shell by radial beams; numerous radial beams also connect outer medullary shell to cortical twin shell at the equatorial constriction.

Length of cortical twin shell 118-1 84µm. Maximum breadth of cortical twin shell 63-99µm,

Etymology: This species was named irregularis because of the irregular nature of its cortical and extracortical shells

Editors' Notes
Rare in samples from along the coast of Central and South America; absent from all other samples examined (text-figure 4).


Nigrini, C. A. (1968). Radiolaria from eastern tropical Pacific sediments. Micropaleontology. 14(1): 51-63. gs


Cypassis irregularis compiled by the radiolaria@mikrotax project team viewed: 21-4-2021

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