radiolaria - rads_cat - Spongostaurus gracilis radiolaria - rads_cat - Spongostaurus gracilis

CATALOG OF ORIGINAL DESCRIPTIONS: Spongostaurus gracilis Swanberg et al. 1985

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: rads_cat -> S -> Spongostaurus [homonym] -> Spongostaurus gracilis
Other pages this level: S. gracilis, S. lobus

Spongostaurus gracilis

Citation: Spongostaurus gracilis Swanberg et al. 1985
Taxonomic rank: species
Described on page(s) : 457
Type specimens: The holotype specimen was collected by N. Swanberg at 10.30 local time on 30 October, 1978 in the upper 10 m of water, temperature 21.0°C. The specimen has been deposited with the U.S. National Museum. Specimen (No. USNM 33288). A paratype specimen of the
Type locality: Surface: 35°45'N, 14°06'W; station 731.

Current identification/main database link: Spongostaurus gracilis (Swanberg et al. 1985)


Original Description

Diagnosis. Spongiose sphaeroid skeleton. Central capsule with very large projections 1-2 cm in length filled with conspicuous spheres of brownish oily-appearing substance. Gelatinous sheath ca. 5 mm thick surrounding central capsule.

Description. Sphaerellarian radiolarian with large (ca. 200 ~m) spongiose sphaeroid siliceous skeleton. Skeleton surrounded by massive central capsule (Plate I, 1) drawn into several (usually 3-5) arm-like projections, 1-2 cm in length and radiating from the central skeleton (Plate I, 2). The projections may bifurcate. Extremely delicate skeletal material extends into the arms and extracapsular region surrounding them. Capsular projections provided with large oily globules roughly arranged in rows but absent from narrow constriction near base of projection. Entire central capsule including projections surrounded by gelatinous sheath penetrated by rhizopodia. As many as 10 unusually heavy rhizopodia emerge from along one side of each capsular projection, extending beyond its tip, through the gelatin into the outer milieu. Gelatinous zone occupied by symbiotic algae, including probably dinoflagellates and occasionally Pyrocystis lunula.

References:

Swanberg, N. R., Anderson, O. R. & Bennett, P. (1985). Spongiose spumellarian Radiolaria: The functional morphology of the radiolarian skeleton with a description of Spongostaurus, a new genus. Marine Micropaleontology. 9(5): 455-464. gs


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Spongostaurus gracilis compiled by the radiolaria@mikrotax project team viewed: 12-6-2026

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