radiolaria - rads_cenozoic - Amphitholus


Classification: rads_cenozoic -> Tholoniidae -> Tholoniidae inc sed -> Amphitholus
Sister taxa: Amphitholus, Cubotholus, Tholoma
Daughter taxa (time control age-window is: 0-800Ma)
Amphitholus acanthometra

neptune records:
Amphitholus sp.

neptune records: 14


Citation: Amphitholus Haeckel 1887
Rank: genus
Basionym: Amphitholus

Catalog entries: Amphitholus

Original description: Tholonida with simple cortical shell (without external veil), with two hemispherical cupolas, opposite on the poles of one axis; central chamber (between them) Larnacilla-shaped, with medullary shell.

The genus Amphitholus is the most simple form of all Coccotholida (or all Tholonida provided with medullary shell). Its simple cortical shell exhibits, like Tholartus, two lateral hemispherical cupolas, attached on both sides of a lentelliptical central chamber (on the poles of its transverse axis). The central chamber has the form of a triaxial ellipsoid, and contains, like Larnacilla, a small medullary shell, connected with it by the wings of a latticed transverse girdle. Amphitholus may be derived either from Tholartus by secondary production of a cortical shell, or (more probably) from Larnacilla by apposition of two lateral dome-shaped protuberances. In the latter case it may be regarded as an Amphipyle, the lateral open wings of which are closed by lattice-work.


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Gelasian Stage (0% up, 2.6Ma, in Piacenzian stage). Data source: Total of range of species in this database

Plot of occurrence data:


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 year 1873-1876, Zoology. 18: 1-1803. gs


Amphitholus compiled by the radiolaria@mikrotax project team viewed: 24-9-2021

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