Spongurus bilobatus


Classification: rads_cenozoic -> Spongodiscidae -> Sponguridae -> Spongurus -> Spongurus bilobatus
Sister taxa: S. bilobatus, S. cauleti, S. cylindricus, S. pylomaticus, S. quadratus, S. spatulaeformis, S. sp.,

Taxonomy

Citation: Spongurus bilobatus Clark & Campbell 1942
Rank: species
Basionym: Spongurus bilobatus
Notes & discussion: Clark and Campbell, 1942, p.36, pl.1, figs.7,9

Catalog entries: Spongurus bilobatus

Original description: Shell generally cylindrical, about 2 and a quarter times longer than wide, with two equal, equally spaced, rounded lobes, forming the two ends, the lobes being each about a fourth of the whole length, and the central region swells from their necks to its widest level at the middle; surface nearly smooth; spongy framework of the same structure throughout the whole except the edges of the midregion which are looser, generally the mesh compact; meshes much wider than the bars.

Length, 220µm; width across the widest part, 90µm; end knobs, 50 by 60µm, their necks, 20µm across. Distinguishing characters (rw): In form this species is like S. phalanga Haeckel (1887) but is somewhat plumper; the latter lacks the terminal lobes.

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. (1942). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs :: ::


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Spongurus bilobatus compiled by the radiolaria@mikrotax project team viewed: 31-5-2020

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