radiolaria - rads_cenozoic - Protoscenium simplex radiolaria - rads_cenozoic - Protoscenium simplex

Protoscenium simplex

Classification: rads_cenozoic -> Plagiacanthidae -> Plagiacanthidae (ss) -> Protoscenium -> Protoscenium simplex
Sister taxa: P. simplex, P. sp.


Citation: Protoscenium simplex Joergensen 1905
taxonomic rank: species
Basionym: Protoscenium simplex
1899 Plectanium (?) simplex - Cleve p. 32; pl. 3, fig. 3
1905 Protoscenium simplex - Jørgensen p. 133; pl. 15, fig. 69
2003 Protoscenium simplex - Bjørklund and Kruglikova pl. 6, fig. 8

Catalog entries: P. simplex [no catalog entry yet]


Published descriptions

Jørgensen 1905 - Plectanium simplex

Cfr. the description of the genus and the introductory remarks. Each of the primary branches of the main spines has, as already mentioned, near their end, a verticil of 3 branches, of which the two are the connecting arches mentioned above, the third being a short spine about equal in length to the free end of the branch. This spine may - as above mentioned - be connected with one of the approximate corresponding ones, or with the protruding part of the main spine, by exceedingly fine arches. Here and there on the outer arches fine byspines are found, which are perhaps partly developed into such hair-like connecting arches. The species is no Plectanium in Haeckels sense. Cleve draws the apical spine as protruding from the common starting point of the basal spines, and has, probably for this reason, classed the species as belonging to HCK s genus Plectanium.I have seen only a few individuals of this species; but I have, nevertheless, no doubt that its characteristic structure in all important points is as above described. Older individuals have, perhaps, a more richly developed network of added, secondary arches. Rare and only singly: 19/1 1899, 40 miles NW of Gaukværø, 0-700 m. Is, however, easily overlooked.

Distribution: Only noticed by Cleve from two places: 78° N, 3° W, deep sea haul; 56° N, 36° W. Probably also boreal oceanic.

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"

Plot of occurrence data:


Bjørklund, K. R. & Kruglikova, S. B. (2003). Polycystine radiolarians in surface sediments in the Arctic Ocean basins and marginal seas. Marine Micropaleontology. 49(3): 231-273. gs

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

Missing or ambiguous references: Cleve 1899;


Protoscenium simplex compiled by the radiolaria@mikrotax project team viewed: 15-7-2024

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