radiolaria - rads_cat - Plectacantha radiolaria - rads_cat - Plectacantha


This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: rads_cat -> P -> Plectacantha
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Plectacantha cremastoplegma Nigrini 1968
= Plectacantha cremastoplegma
Plectacantha oikiskos Jørgensen 1905
= Plectacantha oikiskos
Plectacantha trichoides Jørgensen 1905
= Plectacantha trichoides


Citation: Plectacantha Jørgensen 1905
taxonomic rank: genus
Type species: Plectacantha oikiskos Jørgensen 1905 [designated by Campbell,1954, p.D104]
Described on page(s) : 131
Family (traditional): Plagiacanthidae

Current identification/main database link: Plectacantha Jørgensen 1905

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.


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 O


Plectacantha compiled by the radiolaria@mikrotax project team viewed: 16-6-2024

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