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

neptune records:

neptune records:

neptune records:

neptune records: 268


Rank: family (new classif)
Type species: Sethophormis Haeckel 1881
Notes & 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: Wide conical or nearly flat 2 segmented forms with relatively large but inconspicuous highly flattened cephalis.

Morphology remarks:

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



Phylogenetic relations:

Similar species:

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of Chattian Stage (100% up, 23Ma, in Chattian 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: 1-10-2020

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