CATALOG OF ORIGINAL DESCRIPTIONS: Clathrocyclas universa universa Clark & Campbell 1942
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Clathrocyclas (Clathrocyclia) universa universa Clark and Campbell 1942.jpg
Clathrocyclas universa universa
Citation: Clathrocyclas universa universa Clark & Campbell 1942taxonomic rank: sub-speciesDescribed on page(s) : p.86Type specimens: pl.7, figs.11,14,19,20Type repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): TheoperidaeFamily (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. Size: Length of shell, 230µm; of horn, 87.0µm; of cephalis, 23.2µm; diameter; of aperture, 109.0µm; of thoracic pores, 16.6µm. Extra details from original publication Distinguishing characters: 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. Editors' Notes [The authors here list this species under the subgeneric name Clathrocyclia and include the subgeneric name in the species name.
References:
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 teamviewed: 5-12-2024
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Clathrocyclas (Clathrocyclia) universa universa Clark and Campbell 1942.jpg
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