radiolaria - rads_cenozoic - Lamprocyclas margatensis

Lamprocyclas margatensis

Classification: rads_cenozoic -> Pterocorythidae -> Lamprocyclas -> Lamprocyclas margatensis
Sister taxa: L. aegles, L. hadros, L. hannai, L. inexpectata, L. junonis, L. margatensis, L. maritalis, L. matakohe, L. particollis, L. prionotocodon, L. rhinoceros, L. particollis, L. sp., L. sp.


Citation: Lamprocyclas margatensis (Campbell and Clark) Caulet 1986
Rank: species
Basionym: Calocyclas margatensis
Taxonomic discussion: (Campbell & Clark) 1944 p.47 pl.6 figs.17&18; Nakaseko, 1963 p.178 pl.2 figs.1&2; Caulet 1986 p.852 pl.4 fig.3

Catalog entries: Calocyclas margatensis

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.

Length, total, 240µm; diameter, maximum, 120µm, of largest pores, as much as 22µm. Distinguishing characters (rw): 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.
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.




Biogeography and Palaeobiology

Biostratigraphic distribution

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. (1944a). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs

Caulet, J. (1986a). 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


Lamprocyclas margatensis compiled by the radiolaria@mikrotax project team viewed: 6-7-2022

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