rad_org Dictyophimus histricosus img1699.jpg
rad_org Dictyophimus histricosus img1700.jpg
rad_org Dictyophimus histricosus img966.jpg
rad_org Dictyophimus histricosus img1699.jpg
rad_org Dictyophimus histricosus img1700.jpg
rad_org Dictyophimus histricosus img966.jpg
1905 Dictyophimus histricosus - Jørgensen p. 138; pl. 16, fig. 89
1966 Helotholus histricosa - Benson p. 462; pl. 31, fig. 6, (not figs. 4-5, 7-8)
1983 Helotholus histricosa group - Benson p. 504; pl. 8, fig. 1, (not figs. 2-3)
From Suzuki Paleotax db:
1905 Dictyophimus histrocsa n. sp. Jörgensen p. 138, pl. 16, fig. 89
1937 Dictyophimus histricosus Joergensen Wailes p. 13, fig. 24
1963 Dictyophimus histricosus Jorgensen Huelsemann p. 26
1978 Dictyophimus sp. aff. histrocosus Jorgensen Dzinoridze et al. pl. 26, fig. 11
2017 Dictyophimus histricosus Jörgensen Chen et al. p. 186, pl. 63, fig. 1
Catalog entries: Dictyophimus histricosus
type material: D. histricosusOriginal description: Cephalis semispherical, thorax pyramidal. The basal spines extend from the central rod (under the neck stricture) to the thorax and continue in the thoracic wall to the very margin below where they protrude as "basal feet". The apical spine, D, runs chiefly in the wall of the cephalis (as in the two preceding species Dictyophimus clevei Jørgensen and Helotholus histricosa Jørgensen) and above is prolongated to a tophorn, which I is only very little different to the byspines in appearance. This is also the case with the ventral. sagittal spine, which runs obliquely upwards and out through the neck stricture. All the main spines are narrow, not three-edged. Cephalis and thorax rather plentifully provided with narrow, needle-shaped byspines, which are longest and most numerous on the cephalis. The longest are as long, or even a little longer, than the diameter of the cephalis. The pores are uneven in shape and size, varying from quite small to 9µ not much smaller on. the cephalis than on the thorax. Here too the three swellings on the upper part of the thorax between the main spines (fig. 89 b) are to be found.
The width of the lattice shell is 85 µ, its height (not including the basal feet) 68 µ. The cephalis alone is 34 µ wide and 22 µ high.
Very rare and only singly
Remarks on original description: Probably boreal oceanic.
Benson 1966 - Dictyophimus histricosus Benson, 1966, p. 462 under Remarks: pl. 31, fig. 6, (not figs. 4-5. 7-8):Dictyophimus histricosus(?) JørgensenA few specimens tentatively identified as Helotholus histricosa Jørgensen have dorsal and primary lateral ribs in the thoracic wall. These extend as terminal feet or foot-like spines (Pl. 31, fig. 6).They more or less conform to Jørgensen's illustration of Dictyophimus histricosusJørgensen (1905, Pl. 16, fig. 89).However, they may be variant forms of D. gracilipes Bailey from the Gulf. Study of Jørgensen's type material should settle the question whether or not D. histricosus is synonymous with Helotholus histricosa.
Published descriptions
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:
Benson, R. N. (1966). Recent Radiolaria from the Gulf of California. Thesis, Minnesota University. 1-577. gs Benson, R. N. (1983). Quaternary radiolarians from the Mouth of the Gulf of California, Deep Sea Drilling Project Leg 65. Initial Reports of the Deep Sea Drilling Project. 65: 491-523. 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 OReferences:
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Dictyophimus histricosus compiled by the radiolaria@mikrotax project team viewed: 22-7-2026
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