Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Plectacantha
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)
Plectacantha cremastoplegma

neptune records:
Plectacantha oikiskos

neptune records:
Plectacantha trichoides

neptune records:
Plectacantha sp.

neptune records: 6


Citation: Plectacantha Jørgensen 1905
Rank: genus
Basionym: Plectacantha

Catalog entries: Plectacantha

Original description: Has the four primary spines, the sagittal, dorsal, basal one, D, the two ventral, lateral, basal ones Lr and Ll, as well as the sagittal, apical one A. Besides there are, between these, three primary arches developed, one ventral, Bv, between the ventral, lateral spines, and two lateral Br and Bl between the dorsal, basal spine and the right and left lateral one. In this way, 3 large, pentagonal meshes are formed, the primary ventral mesh, the primary right lateral and the primary left lateral meshes.

As mentioned above in the general remarks on the Nassellaria group, the ventral mesh and the left, lateral one have as a side in common a short branch which descends from the under side of the left, lateral spine, while, on the other side, the right, lateral mesh and the ventral mesh reach immediately up to the right, lateral spine.

There is no ventral, sagittal spine extending from the common starting point for the two ventral, lateral main spines.

In addition to these primary spines and arches, secondary ones are also more or less developed, and form a comparatively rich network, which is, however, open, or very 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 Aquitanian Stage (0% up, 23Ma, in Aquitanian 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


Plectacantha compiled by the radiolaria@mikrotax project team viewed: 19-4-2021

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