Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Pseudodictyophimus
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)Granddaughter taxa
Pseudodictyophimus amundseni

neptune records: 30

Pseudodictyophimus callosus

neptune records: 23

Pseudodictyophimus galeatus

neptune records: 9

Pseudodictyophimus gracilipes

neptune records: 68

Pseudodictyophimus horrida

neptune records: 90

Pseudodictyophimus platycephalus

neptune records: 6

Pseudodictyophimus tanythorax

neptune records:

Pseudodictyophimus sp.

neptune records: 117


Citation: Pseudodictyophimus Petrushevskaya 1971
Rank: genus
Basionym: Pseudodictyophimus
Type species: Dictyophimus gracilipes Bailey 1856

Catalog entries: Pseudodictyophimus

Original description: Lophophaeninae with a small I segment and a substantial II segment, which is frequently closed below. Spine A yields a long apical horn, spines D, Lr and Ll represent lateral legs, which are frequently also rather long. Spine Vert forms a small occipital horn. Arches ap, which divide the I and II segments, are well developed, whereas arches cd and dd are not expressed. The cephalic chamber (I segment) is hardly raised above the arches ap. The smallest pores are on the cephalis and the largest ones on the lower part of the II segment. The pores are unequal in size and frequently irregularly distributed.
Translated description: In Russian. Translation vua W.R.Riedel and J.P.C.]
Remarks on original description: [According to many authors this genus corresponds approximately to the genus Dictyophimus (Bailey, 1856; Haeckel, 1887; Cleve, 1899, 1900a, 1900b; Jørgensen, 1889, 1905; Popofsky, 1908, 1913; Schröder, 1914; Bernstein, 1934; Dogel and Reshetnyak, 1952; Riedel, 1958; Petrushevskaya, 1962, 1967a). All these authors related to the genus Dictyophimus the two-segmented forms which are similar to D. gracilipes. Campbell (Campbell, 1954) isolated D. lucerna as the type species for Dictyophimus (Ehr. 1854), which was originally related by Ehrenberg to the genus Lychnocanium and only later (Haeckel, 1887) transferred to the genus Dictyophimus. Nigrini (Nigrini, 1967) suggested D. crisae as type species for Dictyophimus, i.e. a species which Ehrenberg himself described in the genus Dictyophimus. Although Nigrini is formally quite correct, there are some complications in that D. crisae has not been illustrated by Ehrenberg and it is almost impossible to visualize its structure without having a figure. Nigrini found a form in topotypical material, which in her opinion should be named D. crisae. This three-segmented form is extremely similar to the representatives of the genus Lychnocanium (see below). If we accept the mentioned form as type species of Dictyophimus, the concept of the genus should be changed. The species close to D. gracilipes can no longer be related to the genus Dictyophimus. In this connection we take the liberty to describe for such species a new genus, i.e. the genus Pseudodictyophimus. Within the range of the genus Pseudodictyophimus one can trace the line: P. charlestonensis - P. gracilipes - P. platycephalus, in which occurs a gradual thickening of the I segment and a widening of the thorax, resulting in an umbrella-shaped skeleton.

[Stratigraphic distribution: Eocene to Recent. Cosmopolitan distribution.]


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 Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Petrushevskaya, M. G. (1971a). Radiolyarii Nasselaria v planktone Mirovogo okeana [Nasellarian radiolarians in the plankton of the world ocean]. Trudyi Zoologicheskogo Instituta, Akademiya Nauk, SSSR. 9(17): 1-294. gs


Pseudodictyophimus compiled by the radiolaria@mikrotax project team viewed: 23-4-2021

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