radiolaria - rads_cenozoic - Plagiacanthidae radiolaria - rads_cenozoic - Plagiacanthidae

Plagiacanthidae


Classification: rads_cenozoic -> Plagiacanthidae
Sister taxa: Actinommidae, Coccodiscidae, Heliodiscidae, Litheliidae, Orosphaeridae, Pyloniidae, Spongodiscidae, Tholoniidae ⟩⟨ Amphipyndacidae, Archaeodictyomitridae, Artostrobiidae, Cannobotryidae, Carpocaniidae, Plagiacanthidae, Pterocorythidae, Theoperidae, Trissocyclidae ⟩⟨ Collophidiidae, Collosphaeridae, Sphaerozoidae ⟩⟨ incertae sedis, hidden
Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Lophophaenidae
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:
Plagiacantha
Plectagonidium
Protoscenium
Rhabdolithis
Tetraplecta

Plagiacanthidae inc sed

neptune records:
Acanthocorys
Corythomelissa
Theopilium
Tripilidium

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

Sethophormididae
Wide conical or nearly flat 2 segmented forms with relatively large but inconspicuous highly flattened cephalis.
neptune records:
Enneaphormis
Genetrix
Sethophormis
Tetraphormis
Velicucullus

Theopiliidae
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:
Clathrocycloma
Eucecryphalus
Lampromitra

Taxonomy

Citation: Plagiacanthidae
Taxonomic rank: family
Basionym: Plagiacanthidae

Catalog entries: Plagiacanthidae

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Description


Published descriptions


Lazarus et al. 2021 -

Nassellaria usually with, in addition to the primary spicules, well developed additional
arches and secondary spines, but reduced development of external lattice wall shell, having no, one
or at most two segmented shells; and an undivided (un-lobed) cephalis

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:


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Plagiacanthidae compiled by the radiolaria@mikrotax project team viewed: 20-4-2026

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=205037 Go to Archive.is to create a permanent copy of this page - citation notes



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