radiolaria - rads_cenozoic - Heterosestrum <title>radiolaria - rads_cenozoic - Heterosestrum


Classification: rads_cenozoic -> Coccodiscidae -> Heterosestrum
Sister taxa: Cypassis, Diartus, Didymocyrtis, Heterosestrum, Lithocyclia, Periphaena, Phacodiscus, Sethodiscus, Spongoliva, Stylocyclia, Trigonocyclia
Daughter taxa (time control age-window is: 0-800Ma)
Heterosestrum sexispinatum rotundum

neptune records: 1
Heterosestrum sp.

neptune records:


Citation: Heterosestrum Clark and Campbell 1945
Rank: genus
Basionym: Heterosestrum
Taxonomic discussion: Has been assigned to Actinommidae, here assigned to Coccodiscidae following new classification being developed by Suzuki & co-workers

Catalog entries: Heterosestrum

Original description: Heliosestrinae with double medullary shell and with 6 (rarely fewer) solid regularly disposed radial spines on the margin of the disc.




Biogeography and Palaeobiology

Similar species

Geographic distribution


Phylogenetic relations

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of Chattian Stage (100% up, 23Ma, in Aquitanian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:


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


Heterosestrum compiled by the radiolaria@mikrotax project team viewed: 7-2-2023

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