radiolaria - rads_cat - Clathrocyclas universa universa

CATALOG OF ORIGINAL DESCRIPTIONS: Clathrocyclas universa universa Clark & Campbell 1942

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 -> Clathrocyclas -> Clathrocyclas universa universa
Other pages this level: C. alcmenae, C. aurelia, C. australis, C. basilea, C. cabrilloensis, C. cassiopeiae, C. collaris, C. coscinodiscus, C. danaes, C. diceros, C. europae, C. humerus, C. jonis, C. latonae, C. lipmanae, C. pirum, C. principessa, C. semeles, C. transitiva, C. universa, C. universa amplaspina, C. universa cylindrica, C. universa grandis, C. universa grandis [pri. jun. hom], C. universa kranimorphos, C. universa longispina, C. universa nova, C. universa subadvena, C. universa undella, C. universa universa

Clathrocyclas universa universa

Citation: Clathrocyclas universa universa Clark & Campbell 1942
Rank: sub-species
Described on page(s) : p.86
Type specimens: pl.7, figs.11,14,19,20
Type repository: University of California, Museum of Paleontology, San Francisco
Family (traditional): Theoperidae
Family (modern): Theopilidae

Current identification:

Original Description

Shell generally bell-shaped, with a long horn and a very short, expanded rimlike abdomen; apical horn about 0.36 total length, vertical or asymmetrical in occasional individuals, conical (2°) in side view, narrowly blunted at the tip, and simple at the base but with two equal, rather strong, opposite, apically decurrent, left-twisted (3°) blades which extend 0.5 the length of the horn from the base; cephalis rounded, more or less caplike (about 45°), often asymmetrical, wider than high, the sides falling away rapidly and only a little convex, limited basally chiefly by change in contour; thorax the longest shell segment (about 0.42 total length), very strongly convex (approximately 93° at first, later gradually reduced to only 18°), the greatest diameter reached at or near the middle, the thorax basally limited by a narrow, internal, horizontal, septal band; abdomen a short, widely flaring (70°) skirt, like that of a classic ballet-dancer, its length hardly 0.1 total length or often even less; apertural margin regularly provided with approximately sixteen (to twenty) subequal, more or less equidistant, subtriangular, pronglike feet, sometimes irregular as if eroded or torn (Figs. 19, 20); wall thick and rough; surface of horn, cephalis, and shell framework hyaline; of cephalis poreless; of thorax, with thirty or more (on one side) subuniform, deeply set, well-spaced, circular pores set into concave areas around which are strong, conelike, blunted sepaloid points, the pores in a half dozen or more tiers; of abdomen, pores a little smaller than those of thorax, in a single row, and with an additional row of very tiny pores above them but below the basal thoracic tier.

Length of shell, 230µm; of horn, 87.0µm; of cephalis, 23.2µm; diameter; of aperture, 109.0µm; of thoracic pores, 16.6µm. Distinguishing characters (rw): A suite of four specimens is illustrated of which one individual (Fig. 11) appears to be the most perfect.
Clathrocyclas universa universa n. subsp. differs from C. universa undella n. subsp. in less strongly convex thorax and different apical horn. Varieties - viz., C. universa longispina and C. ,universa amplispina n. vars. - differ in having very different apical horns or, as in C. universa cylindrica and C. universa grandis n.vars., in abdominal characters.




Extra details from original publication

Editors' Notes
[The authors here list this species under the subgeneric name Clathrocyclia and include the subgeneric name in the species name.


Clark, B. L. & Campbell, A. S. (1942a). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs


Clathrocyclas universa universa compiled by the radiolaria@mikrotax project team viewed: 4-12-2022

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