radiolaria - rads_cat - Amphitholus acanthometra radiolaria - rads_cat - Amphitholus acanthometra

CATALOG OF ORIGINAL DESCRIPTIONS: Amphitholus acanthometra 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 -> A -> Amphitholus -> Amphitholus acanthometra
Other pages this level: A. acanthometra, A. armatus, A. artidium, A. artiscus, A. dodecanthus, A. octacanthus, A. panicium, A. polyacanthus

Amphitholus acanthometra

Citation: Amphitholus acanthometra Haeckel 1887
taxonomic rank: species
Described on page(s) : p.667
Type specimens: pl.10, figs.5,6
Type age (chronostrat): [presumably Quaternary]
Type locality: LM41
Type repository: No information given

Current identification/main database link: Amphitholus acanthometra Haeckel 1887


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).

Size:
Major axis of the shell 140 to 160µm, minor axis 100 to 120µm; pores 15µm, bars 4µm; major axis of the medullary shell 40 to 50µm, minor (horizontal) axis 20 to 30µm; length of the twenty radial spines 180 to 240µm, basal breadth 10µm.

Extra details from original publication
Habitat: South Pacific, Station 300, depth 1375 fathoms

Editors' Notes
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 mentioned, but this species is not known. Haeckel here probably intends Amphitholonium acanthonium.[comment from RadWorld database]

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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Amphitholus acanthometra compiled by the radiolaria@mikrotax project team viewed: 11-9-2024

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