CATALOG OF ORIGINAL DESCRIPTIONS: Calocyclas margatensis Campbell & Clark 1944
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Calocyclas (Calocycletta) margatensis Campbell and Clark 1944.jpg
Calocyclas margatensis
Citation: Calocyclas margatensis Campbell & Clark 1944Taxonomic rank: speciesDescribed on page(s) : p.47Type specimens: pl.6, figs.17,18Type repository: University of California, Museum of Paleontology, San FranciscoFamily (traditional): PterocorythidaeFamily (modern): Pterocorythidae
Original Description Shell fairly large, stout (approximately twice as long as maximum diameter), bell-shaped; apical horn hyaline, stout (10°), with four wide, triangular blades which run down sides of cephalis below it, its tip sharp; cephalis generally narrow conical (33°), sometimes decidedly asymmetrical and with cervix about 0.35 maximum diameter, length about same as diameter at base; thorax strongly (apically truncate) subhemispherical, thoracic maximum diameter only a little less than that of greatest width of shell, and length about 0.5 that amount; thoracic stricture marked by an internal transverse septum; abdomen laterally (and strongly) convex, maximum diameter reached at or near its middle, below this level shell contracts quickly to squarely truncated aperture; apertural margin about 0.82 maximum diameter in diameter, its margin with about a dozen, divergent, subequidistant, distally sharpened, strong, spikelike teeth; wall fairly thick save distally where it is thinner, dull gray; pores of cephalis 25 or more, fairly well defined in transverse rows, well separated, circular, quite large, of thorax somewhat larger but otherwise rather similar to those above, of abdomen larger again, perhaps 200, all subcircular and less deeply set than in thorax, otherwise pore characters similar to those above.
Size: Length, total, 240µm; diameter, maximum, 120µm, of largest pores, as much as 22µm. Etymology: No inforrmation given Extra details from original publication Distinguishing characters:Calocyclas margatensis n. sp. differs from rather similar hannai n. sp., in being shorter, somewhat stouter, with larger abdominal pores, and in very different apertural characters including, especially, fewer and larger spikelike radial apophyses. Editors' Notes [Campbell and Clark here list the species under the subgeneric name Calocycletta and include the subgeneric name in the species name.
References:
Campbell, A. S. & Clark, B. L. (1944). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs
Calocyclas margatensis compiled by the radiolaria@mikrotax project teamviewed: 18-6-2026
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Calocyclas (Calocycletta) margatensis Campbell and Clark 1944.jpg margatensis Campbell and Clark 1944.jpg)
Calocyclas (Calocycletta) margatensis Campbell and Clark 1944.jpg
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