Spongatractus


Classification: rads_cenozoic -> Spongodiscidae -> Sponguridae -> Spongatractus
Sister taxa: Spongatractus, Spongurus
Daughter taxa: (blue => in age window 0-800Ma)
Spongatractus balbis

neptune records: 122
Spongatractus pachystylus

neptune records: 316
Spongatractus sp.

neptune records:

Taxonomy

Citation: Spongatractus Haeckel 1887
Rank: genus
Basionym: Spongatractus
Taxonomic discussion: Has been assigned to Actinommidae, here assigned to Sponguridae following new classification being developed by Suzuki & co-workers

Catalog entries: Spongatractus

Original description: Spongurida with spongy ellipsoidal cortical shell, enclosing a simple, spherical or ellipsoidal, latticed medullary shell. On the poles of the axis occur opposite strong spines.

The genus Spongatractus differs from Spongodruppa by development of two strong spines in the axis of the shell, on its two opposite poles; therefore it bears the same relation to the latter that Lithatractus does to Druppula, and can be derived from Lithatractus by a spongy thickening of the cortical shell.
Remarks on original description: [Campbell [1954, p.D74] considers Spongatractus Haeckel, 1887a to be an objective synonym of Spongosphaera Ehrenberg, 1847b. He designates Spongosphaera pachystyla Ehrenberg, 1873a as the type species of Spongosphaera and only by inference of Spongatractus. However, the type species of Spongosphaera [by subsequent monotypy] is Spongosphaera polyacantha Muller, 1857. Therefore, we consider the type species designation of Spongosphaera pachystyla Ehrenberg, 1873a, p.256; Ehrenberg, 1875, pl.26, fig.3, x300 for Spongatractus to date from Chediya, 1959, p.115].

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of Chattian Stage (100% up, 23Ma, in Chattian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:

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


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Spongatractus compiled by the radiolaria@mikrotax project team viewed: 29-10-2020

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