radiolaria - rads_cenozoic - Amphitholus acanthometra

Amphitholus acanthometra

Classification: rads_cenozoic -> Tholoniidae -> Tholoniidae inc sed -> Amphitholus -> Amphitholus acanthometra
Sister taxa: A. acanthometra, A. sp.


Citation: Amphitholus acanthometra Haeckel 1887
Rank: species
Basionym: Amphitholus acanthometra

Catalog entries: Amphitholus acanthometra

Original description: Central chamber about twice as broad and as high as both cupolas. On the surface quite symmetrically distributed twenty long and strong cylindrical radial spines; eight in the sagittal plane or in the meridian plane of the central chamber (four opposite in pairs in the principal and the sagittal axes, four others in the middle between the principal and the sagittal spines); four in the horizontal transverse plane, on both sides of the poles of the major or lateral axis; and eight in diagonal planes (corresponding to the eight wing-spines of Tetrapyle octacantha). In the centre of the central chamber is a distinct trizonal medullary shell like that of Tetrapyle, with two vertical columella beams. Pores of the cortical shell subregular, circular, with elevated hexagonal frames, about four times as broad as the bars; five to seven in the semicircle of one cupola. (This remarkable species differs from Tholartus vicenus in the possession of a medullary shell, from Amphitholonium acanthometra by the simple cortical shell. Compare these species).
Remarks on original description: Haeckel listed Amphitholus acanthometra under the subgeneric name Amphitholura, but did not include the subgeneric name in the species name.

In the description, the species name Amphitholonium acanthometra is not know. Haeckel here probably intends Amphitholonium acanthonium.[comment from RadWorld database]




Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"

Plot of occurrence data:



Amphitholus acanthometra compiled by the radiolaria@mikrotax project team viewed: 2-7-2022

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics