radiolaria - rads_cenozoic - Spongurus bilobatus <title>radiolaria - rads_cenozoic - Spongurus bilobatus

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.


Citation: Spongurus bilobatus Clark & Campbell 1942
Rank: species
Basionym: Spongurus bilobatus
Taxonomic 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.
Remarks on original description: [The authors here lists this species under the subgeneric name Spongurantha and 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:


Clark, B. L. & Campbell, A. S. (1942a). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs


Spongurus bilobatus compiled by the radiolaria@mikrotax project team viewed: 8-2-2023

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