radiolaria - rads_cenozoic - Axoprunum losbanosensis radiolaria - rads_cenozoic - Axoprunum losbanosensis

Axoprunum losbanosensis


Classification: rads_cenozoic -> Actinommidae -> Saturnalidae -> Axoprunum -> Axoprunum losbanosensis
Sister taxa: A. euterpe, A. liostylum, A. losbanosensis, A. monostylum, A. pierinae, A. stauraxonium, A. sp.

Taxonomy

Citation: Axoprunum losbanosensis (Clark&Campbell 1945)
taxonomic rank: species
Basionym: Stylosphaera losbanosensis
Taxonomic discussion: (Clark and Campbell) 1945, p.12, pl.1, figs.20-21; Shilov, 1995 (ODP 145 SR)

Catalog entries: Stylosphaera losbanosensis

Original description: Shell globular, with 2 opposite, similar polar spines, these spines very short (only 0.43 diameter of cortical shell in length), generally conical in outline (25°), with sharply pointed free tip, circular section, and simple base; cortical shell thick-walled and very prominent with reference to the short spines and with a smooth surface; medullary shell globular, small (approximately 0.3 diameter of cortical shell), with rather thin polygonal framework and having few fairly thin prismatic radial beams (probably not a dozen); pores of cortical shell similarly everywhere circular and of nearly the same size, relatively few (about 10 across a diameter), and rather deeply set; pores of medullary shell large and few; framework of cortical shell raised, thick, and polygonal but without strong sepaloid points so that the surface is not modified.
Remarks on original description: The authors here list Stylosphaera minor losbanosensis under the subgeneric name Stylosphaerantha and include the subgeneric name in the species name.[comment from RadWorld database]

Description

Biogeography and Palaeobiology

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:

Clark, B. L. & Campbell, A. S. (1945b). Radiolaria from the Kreyenhangen Formation near Los Banos, California. Geological Society of America, Memoir. 1-66. gs

Shilov, V. V. (1995a). Eocene-Oligocene radiolarians from Leg 145, North Pacific. Proceedings of the Ocean Drilling Program, Scientific Results. 145: 117-132. gs


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Axoprunum losbanosensis compiled by the radiolaria@mikrotax project team viewed: 20-5-2024

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