radiolaria - rads_cat - Parastephanus asymmetricus radiolaria - rads_cat - Parastephanus asymmetricus

CATALOG OF ORIGINAL DESCRIPTIONS: Parastephanus asymmetricus Haeckel 1887

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 -> P -> Parastephanus -> Parastephanus asymmetricus
Other pages this level: P. asymmetricus, P. circularis, P. dispar, P. quadrispinus

Parastephanus asymmetricus

Citation: Parastephanus asymmetricus Haeckel 1887
Taxonomic rank: species
Described on page(s) : p.1008
Type specimens: pl.82, fig.10
Type age (chronostrat): [presumably Quaternary though some forms reported from this station appear to be Tertiary]
Type locality: LM28
Type repository: No information given

Current identification:


Original Description

Two horizontal rings thorny, of equal size, irregularly ovate or nearly semicircular, and of somewhat asymmetrical form. The two connecting parallel columellae are straight, cylindrical, about as long as the diameter of the rings. The peculiar asymmetry in the form of the rings raises the possibility that the two columellae in this species are the remaining parts of a frontal ring, and that the sagittal ring has altogether disappeared. In this case the convex half of both rings would be the ventral, the straight half the dorsal part.

Size:
Diameter of the rings 0.1, length of the columellae 0.08.

References:

Haeckel, E (1887). 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


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Parastephanus asymmetricus compiled by the radiolaria@mikrotax project team viewed: 10-5-2026

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