Classification: rads_cenozoic -> Plagiacanthidae
Sister taxa: Actinommidae, Coccodiscidae, Heliodiscidae, Litheliidae, Orosphaeridae, Pyloniidae, Spongodiscidae, Streblonidae, Tholoniidae ⟩⟨ Amphipyndacidae, Archaeodictyomitridae, Artostrobiidae, Cannobotryidae, Carpocaniidae, Plagiacanthidae, Pterocorythidae, Theoperidae, Trissocyclidae ⟩⟨ Collosphaeridae, Sphaerozoidae ⟩⟨ incertae sedis, hidden
Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Two segemented plagiacanthids with well developed cephalis and thorax, and generally some external expression of primary spicules - either as lateral external spines or prolonged in thorax as ribs/feet. Cephalis generally relatively large, thorax termination irregular and lacking any special structures.
neptune records:

Plagiacanthidae (ss)
Plagiacanthids without distinct lattice wall, consisting of the primary spicules with various branches or loose meshwork.
neptune records:

Plagiacanthidae inc sed

neptune records:

One or two segmented forms with external spines usually connected by panels or arches of lattice wall.
neptune records:

Wide conical or nearly flat 2 segmented forms with relatively large but inconspicuous highly flattened cephalis.
neptune records:

Wide conical 2 segmented forms with a small simple subspherical cephalis. External cephalic spines usually cylindrical in cross section, thorax termination usually without a peristome or skirt.
neptune records:


Citation: Plagiacanthidae
Rank: family
Basionym: Plagiacanthidae

Catalog entries: Plagiacanthidae [no catalog entry yet]


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant 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:



Plagiacanthidae compiled by the radiolaria@mikrotax project team viewed: 30-7-2021

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