radiolaria - rads_cenozoic - Theocyrtis litos radiolaria - rads_cenozoic - Theocyrtis litos

Theocyrtis litos

Classification: rads_cenozoic -> Pterocorythidae -> Theocyrtis -> Theocyrtis litos
Sister taxa: T. annosa, T. careotuberosa, T. diabloensis, T. litos, T. perpumila, T. perysinos, T. robusta, T. setanios, T. tuberosa, T. sp.


Citation: Theocyrtis litos (Clark&Campbell 1945)
taxonomic rank: species
Basionym: Theocyrtis litos
Taxonomic discussion: (Clark and Campbell), 1945, p.44, pl.6, figs.13, 20; Shilov, 1995 (ODP 145 SR); ; Chen (1975)

Catalog entries: Calocyclas litos

Original description: Generally conical (50° in upper part, later 30° thence, reduced inverted, to 18°) shell having but little significant changes in contour at the levels of the shell-divisions or between them; having a short (less than 0.2 total length), often tipped, 3-bladed, prismatic pointed apical horn fused basally with the top of the obscured conical cephalis (length about the same as that of the horn); cephalis and thorax conical in continued contour; waist line marked by a narrow, transverse, internal band and with but little local constriction; abdomen inverted, truncate-conical; oral margin ragged (torn?); pores of all 3 shell-divisions similarly circular to elliptical, generally of about the same size, without raised polygonal frames but within individual concave areas.
Remarks on original description: The authors here list Calocyclas litos under the subgeneric name Calocycletta and include the subgeneric name in the species name.[comment from RadWorld database]


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:


Chen, P. H. (1975a). Antarctic Radiolaria. Initial Reports of the Deep Sea Drilling Project. 28: 437-513. gs O

Clark, B. L. & Campbell, A. S. (1945b). Radiolaria from the Kreyenhangen Formation near Los Banos, California. Geological Society of America, Memoir. 1-66. gs

Shilov, V. V. (1995a). Eocene-Oligocene radiolarians from Leg 145, North Pacific. Proceedings of the Ocean Drilling Program, Scientific Results. 145: 117-132. gs


Theocyrtis litos compiled by the radiolaria@mikrotax project team viewed: 13-7-2024

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