rad_org Lamprocyclas margatensis img1221.jpg
rad_org Lamprocyclas margatensis img1221.jpg
1944 Calocyclas margatensis - Campbell and Clark p. 47, pl. 6, figs. 17-18
1986 Lamprocyclas margatensis - Caulet p. 589, pl.4, fig.3
From Suzuki Paleotax db:
1944 Calocyclas (Calocycletta) margatensis n. sp. Campbell & Clark p. 47-48, pl. 6, figs. 17, 18
1952 Calocyclas margatensis Campbell et Clark Riedel p. 8, pl. 1, figs. 3, 4
1953 Calocyclas margatensis Campbell and Clark Riedel p. 811, pl. 85, fig. 8
1954 Calocyclas mrgaatensis Clark and Campbell [sic] Nakaseko pl. 3, fig. 5a, 5b
1955 Calocyclas (Calocycletta) margatensis Campbell and Clark Nakaseko p. 102-103, pl. 9, fig. 6a, 6b
1963 Calocyclas cf. margatensis Clark et Campbell [sic] Bachmann et al. p. 128, pl. 6, fig. 23
1963 Calocyclas margatensis Campbell et Clark Nakaseko p. 178, pl. 2, fig. 1a, 1b, 2a, 2b
1975 Lamprocyrtis margatensis (Campbell et Clark) Foreman pl. 9, fig. 16
1976 Calocyclas margatensis Campbell et Clark Sugano p. 23, pl. 8, fig. 1a, 1b
1976 Calocyclas margatensis Campbell et Clark Sugano pl. 8, fig. 1a, 1b
1986 Lamprocyrtis margatensis (Campbell & Clark, 1944) Caulet pl. 4, fig. 3
1992 Lamprocyclas margatensis (Campbell & Clark) Sugiyama & Furutani p. 207, pl. 18, fig. 7
1992 Lamprocyclas margatensis (Campbell & Clark) Sugiyama et al. pl. 26, figs. 6a-8
1992 Lamprocyclas margatensis (Campbell & Clark) Wang & Yang p. 103-104, pl. 3, figs. 22-24
1999 Calocyclas margatensis Campbell & Clark Tsoy & Shastina pl. 36, fig. 9
Catalog entries: Calocyclas margatensis
 margatensis Campbell and Clark 1944.jpg)
type material: C. margatensisOriginal 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.
Remarks on original description: [Campbell and Clark here list the species under the subgeneric name Calocycletta and include the subgeneric name in the species name.
Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"
Plot of occurrence data:
Campbell, A. S. & Clark, B. L. (1944). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs Caulet, J. (1986b). Radiolarians from the Southwest Pacific. Initial Reports of the Deep Sea Drilling Project. 90: 835-861. gs Nakaseko, K (1963). Neogene Cyrtoidea (Radiolaria) from the Isozaki Formation in Ibaraki Prefecture, Japan. Science Reports, College of General Education, Osaka University. 12(2): 165-198. gs Missing or ambiguous references: Caulet 1986; References:
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Lamprocyclas margatensis compiled by the radiolaria@mikrotax project team viewed: 15-7-2026
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