radiolaria - rads_cat - Archicircus radiolaria - rads_cat - Archicircus


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 -> A -> Archicircus
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not figuredArchicircus duodenus Haeckel 1887

not figuredArchicircus ellipsis Haeckel 1887

Archicircus hertwigii Haeckel 1887

Archicircus hexacanthus Haeckel 1887

not figuredArchicircus monopylus Haeckel 1887

Archicircus monostephus Haeckel 1887

not figuredArchicircus ovalis Haeckel 1887

Archicircus primordialis Haeckel 1887

not figuredArchicircus princeps Haeckel 1887

not figuredArchicircus quadratus Haeckel 1887

Archicircus rhombus Haeckel 1887

Archicircus sexangularis Haeckel 1887

not figuredArchicircus triglyphus Haeckel 1887


Citation: Archicircus Haeckel 1887
taxonomic rank: genus
Type species: Archicircus primordialis Haeckel 1887 [designated by Campbell,1954, p.D106]
Described on page(s) : 940
Family (traditional): Trissocyclidae

Current identification:

Original Description

Stephanida with a simple amphitect or diaphragmatic ring, smooth or thorny, without branched spines and basal feet.

The genus Archicircus is the most primitive and simplest form of all Stephoidea, and probably the commom amcestral from, not only of this suborder, but of the greater number of all Nassellaria (compare above p.893). The skeleton consists only of a quite simple sagittal ring, in which commonly a slight difference of both poles of the main axis (basal and apical pole) is visible, but no difference between the dorsal and the ventral bow of the ring. In my Prodromus (1881, p.447) the species of Archicircus were disposed partly in the subgenus Monostephus, partly in the genus Lithocircus.

Greek archicircus = primordial ring"

Extra details from original publication

Sub-genera described:

Editors' Notes
[In accordance with ICZN (1961) art.23 (e,I) this genus should have been called Monostephus Haeckel 1881a, since Haeckel, 1887a treats Monostephus as a subgenus of Archicircus, and the other subgeneric name used is of a later date.

In description the text on p.893 deals with the entire legion of Nassellaria.

Synonymized with Lithocircus Müller by Petrushevskaya, p.269]


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


Archicircus compiled by the radiolaria@mikrotax project team viewed: 26-5-2024

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