radiolaria - rads_cenozoic - Amphymenium amphistylium

Amphymenium amphistylium

Classification: rads_cenozoic -> Litheliidae -> Litheliidae inc sed -> Amphymenium -> Amphymenium amphistylium
Sister taxa: A. amphistylium, A. challengerae, A. splendiarmatum, A. sp.


Citation: Amphymenium amphistylium Haeckel 1887
Rank: species
Basionym: Amphymenium amphistylium
Taxonomic discussion: Haeckel 1887; Morley and Nigrini 1995

Catalog entries: Amphymenium amphistylium

Original description: Both arms equal, three times as long as broad, thickened towards the truncated distal end, and armed with a strong pyramidal terminal spine. Each arm with seven joints, separated by convex, transverse septa, and halved by a radial beam lying in the longitudinal axis. Patagium incomplete, cylindrical, enveloping only the middle part of the shell.

Radius of each arm 180µm, greatest breadth 60µm; transverse breadth of the patagium 80µm.
Remarks on original description: Haeckel listed Amphymenium amphistylium under the subgeneric name Ommathymenium, but did not include the subgeneric name in the species name.




Biogeography and Palaeobiology

Similar species

Geographic distribution


Phylogenetic relations

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:


Haeckel, E (1887a). Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-1876. 18: 1-1803. gs O

Morley, J. J. & Nigrini, C. A. (1995). Miocene to Pleistocene radiolarian biostratigraphy of North Pacific Sites 881, 884, 885, 886, and 887. Proceedings of the Ocean Drilling Program, Scientific Results. 145: 55-91. gs V O


Amphymenium amphistylium compiled by the radiolaria@mikrotax project team viewed: 3-12-2022

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