rad_org Plectacantha trichoides img176.jpg
rad_org Plectacantha trichoides img178.jpg
rad_org Plectacantha trichoides img179.jpg
rad_org Plectacantha trichoides img180.jpg
rad_org Plectacantha trichoides img176.jpg
rad_org Plectacantha trichoides img178.jpg
rad_org Plectacantha trichoides img179.jpg
rad_org Plectacantha trichoides img180.jpg
1905 Plectacantha trichoides - Jørgensen p. 132; pl. 13, fig. 58
1914 Plectacantha trichoides - Schröder p. 83; fig. 26
1976 Plectacantha trichoides - Bjørklund pl. 6, fig. 11
From Suzuki Paleotax db:
1905 Plectacantha trichoides n. sp. Jörgensen p. 132, pl. 13, fig. 58
1968 Plectacantha trichoides Jorgensen Petrushevskaya p. 1302-1303, pl. 2, fig. 4, pl. 3, figs. 10-12, pl. 6, fig. 9
1969 Plectacantha trichoides Jorgensen Petrushevskaya pl. 4, fig. 3
1971 Plectacantha trichoides Jorgensen Petrushevskaya p. 140, pl. 68, figs. 6-9
1976 Plectacantha trichoides Jorgensen Bjørklund pl. 6, fig. 11
1978 Plectacantha trichoides Jorgensen Dumitrica pl. 240, pl. 6, fig. 17
1984 Plectacantha trichoides Jorgensen Nishimura & Yamauchi p. 48-49, pl. 23, fig. 4
Catalog entries: Plectacantha trichoides
type material: P. trichoidesOriginal description: I have only an imperfect knowledge of this species, as I have only seen a few specimens, and at first took these to belong to the preceding species. It has the same primary spines and primary arches; but there appears to be the important difference that the ventral. primary arch and the left, lateral arch both extend to the left, lateral spine, not to a common basal branch from the latter. On the other hand, there is a strong. secondary arch between the left, lateral one and the nearest side of the primary, ventral one. In outer appearance, this species is very different from the foregoing one. Instead of the numerous secondary meshes, long connecting arches are developed, which form together a longish, ovate, very imperfect network of long, fine arches. The largest and strongest of these tun between the two lateral arches and form a very large ovate mesh, pointing downwards. On its sides, especially in a ventral direction, similar large meshes are developed, bounded by fine arch branches which run from the primary arches to the said large, secondary one, or between secondary arches. On these arch branches, very fine spines are scattered, these probably later on being developed into arch branches between the secondary arches. It is likely that a network will appear which is imperfectly closed beneath by basal, secondary arches, on elder individuals. On the primary, basal spines, short byspines are also found on the pieces inside the primary arches.
Remarks on original description: Description: "Cl. L.30" refers to Cleve 1899a. The "preceding species" and "foregoing" refer to Plectacantha oikiskos Jorgensen, 1905.
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. (1976). Radiolaria from the Norwegian Sea, Leg 38 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 38: 1101-1168. 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 Schröder, O (1914). Die nordischen Nassellarian. In, Brandt, K. & Apstein, C. (eds) Nordisches Plankton. Lipsius und Tischer, Kiel and Leipzig (17): 67-146. gs OReferences:
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Plectacantha trichoides compiled by the radiolaria@mikrotax project team viewed: 5-10-2026
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