Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Phormacantha
Sister taxa: Amphiplecta, Antarctissa, Arachnocalpis, Arachnocorallium, Arachnocorys, Archiperidium, Archipilium, Ceratocyrtis, Cryptogyrus, Dictyocephalus, Dictyocryphalus, Entepipedus, Gondwanaria, Lipmanella, Lithocampana, Lithomelissa, Lophophaena, Marimoum, Mitrocalpis, Periarachnium, Peromelissa, Phormacantha, P. inc sed castanoides, Plectacantha, Pseudocubus, Pseudodictyophimus, Pteroscenium, Steganocubus, Tripodocyrtis, Trisulcus
Daughter taxa (time control age-window is: 0-800Ma)
Phormacantha hystrix

neptune records: 2
Phormacantha sp.

neptune records: 15


Citation: Phormacantha Jørgensen 1905
Rank: genus
Basionym: Phormacantha
Type species: Peridium hystrix Jørgensen 1900
Taxonomic discussion: Recent. [rather minimal development of cephalic lattice wall but Jörgensen considered this to be closely related to Plectacantha, which is in the Lophophaenidae-dbl]

Catalog entries: Phormacantha

Original description: Has the same four primary spines and the same three primary arches as Plectacantha. There is, however, also a ventral, sagittal spine, which is less strongly developed than the others (""der secundäre Mittelstachel Jørgensen, 1900, p. 77). The network, as in Plectacantha, is at a late stage and only imperfectly closed beneath.


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 Gelasian Stage (0% up, 2.6Ma, in Gelasian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Jørgensen, E (1905). The protist plankton and diatoms in bottom samples: Radiolaria. In, Nordgaard (ed.) Hydrographical and biological investigation in Norwegian Fjord. 49-151. gs


Phormacantha compiled by the radiolaria@mikrotax project team viewed: 23-4-2021

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