radiolaria - rads_cenozoic - Sethophormididae radiolaria - rads_cenozoic - Sethophormididae


Classification: rads_cenozoic -> Plagiacanthidae -> Sethophormididae
Sister taxa: Lophophaenidae, Plagiacanthidae (ss), Plagiacanthidae inc sed, Sethoperidae, Sethophormididae, Theopiliidae
Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa

neptune records:
Enneaphormis rotula
Enneaphormis sp.


neptune records:
Genetrix petrushevskayae


neptune records:
Sethophormis aurelia
Sethophormis sp.


neptune records:
Tetraphormis dodecaster
Tetraphormis sp.


neptune records: 268
Velicucullus altus
Velicucullus magnificum
Velicucullus oddgurneri
Velicucullus palaeocenica
Velicucullus sp.


Rank: family (new classif)
Type species: Sethophormis Haeckel 1881
Taxonomic discussion: This family is part of the revised classification system being developed by Prof. Suzuki and colleagues

Catalog entries: Sethophormidae [no catalog entry yet]


Distinguishing features:
Parent taxon (Plagiacanthidae):
This taxon: Wide conical or nearly flat 2 segmented forms with relatively large but inconspicuous highly flattened cephalis.


De Wever etal. 2001: Usually wide conical to flat dicyrtid nassellarians with relatively large cephalis, sometimes reduced to some arches.  Basal structure with MB, a shart A, and well developed D and L spines, and arches AD and AL. Spines V and l missing. 

Biogeography and Palaeobiology

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:



Sethophormididae compiled by the radiolaria@mikrotax project team viewed: 7-6-2023

Taxon Search:
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AphiaID: not found
Short stables page link: Go to to create a permanent copy of this page - citation notes

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