radiolaria - rads_cat - Pseudodictyophimus

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Pseudodictyophimus

Citation: Pseudodictyophimus Petrushevskaya 1971

Type species: Dictyophimus gracilipes Bailey 1856 ?

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.

In Russian. Translation vua W.R.Riedel and J.P.C.]

[probably from the Latin pseudo = false + Dictyophimus]

[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.]

References:

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

				Pseudodictyophimus amundseni Goll & Bjørklund 1989 = Pseudodictyophimus amundseni
				Pseudodictyophimus bjorklundi Gladenkov & Devyatkin 1992
				Pseudodictyophimus galeatus Caulet 1991 = Pseudodictyophimus galeatus
				Pseudodictyophimus hexaptesimus Sugiyama et al. 1992
				Pseudodictyophimus ignatitus Renaudie & Lazarus 2015
				Pseudodictyophimus lectairi Caulet 1979
				Pseudodictyophimus leptoretis Funakawa 1995
				Pseudodictyophimus pyramidalis Funakawa 1995
				Pseudodictyophimus? riedeli Petrushevskaya & Kozlova 1979 = Pseudodictyophimus riedeli
				Pseudodictyophimus sphaerothorax Funakawa 1995
				Pseudodictyophimus tanythorax Funakawa 1994 = Pseudodictyophimus tanythorax

CATALOG OF ORIGINAL DESCRIPTIONS: Pseudodictyophimus Petrushevskaya 1971

Pseudodictyophimus

References:

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