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.

Taxonomy

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.

Description


Morphology:


Size:

Biogeography and Palaeobiology


Similar species


Geographic distribution

Paleobiology

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:

References:

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


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

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