Spongodiscidae

Flustrella concentrica, from Ehrenberg (1854).

Belongs within: Stauraxonaria.

The Spongodiscidae are a group of radiolarians, known from the Late Cretaceous to the present, in which the skeleton is flattened or lenticular with the inner frame as a hollow sphere (Afanasieva et al. 2005).

Characters (from Afanasieva et al. 2005): Skeleton flattened or lenticular, inner frame in shape of hollow concentric sphere. Shell reticular, with concentric rings, or spongy, with irregularly built tissue or with densely spaced concentric or spiral rings. Spongy or chambered lobes may be developed.

<==Spongodiscidae [Cyclodiscarea, Euchitoniidae, Euchitoniilae, Ommatodiscidae, Ommatodiscilae]AA05
    |--Amphirhopalum Haeckel 1881 [=Amphirrhopalum Haeckel 1887]AA05
    |--Ommatodiscus Stöhr 1880 [incl. Ommatodiscinus Haeckel 1887, Ommatodisculus Haeckel 1887]AA05
    |--Perichlamydium Ehrenberg 1847AA05
    |--Porodiscus Haeckel 1881 non Grev. 1863 (ICBN) [Porodiscidae]AA05
    |--Spongodiscus Ehrenberg 1854AA05
    |--Stylospongia Haeckel 1862AA05
    |--Tessarastrum Haeckel 1887AA05
    |--Tholodiscus Kozlova 1972AA05
    |--Trigonastrum Haeckel 1887AA05
    |--Chitonastrum Haeckel 1881AA05
    |    `--C. lyraH04
    |--Rhopalastrum Ehrenberg 1847AA05
    |    `--R. trispinosumH04
    |--Spongaster Ehrenberg 1860AA05
    |    `--S. tetrasAA05
    |--Spongotrochus Haeckel 1860AA05
    |    `--S. glacialis Popofsky 1908BC98
    |--Stylochlamydium Haeckel 1881 [incl. Stylochlamys Haeckel 1887, Stylochlamyum Haeckel 1887]AA05
    |    `--S. asteriscusAA05
    |--Stylodictya Ehrenberg 1847AA05
    |    `--S. validispina Jørgensen 1905BC98
    |--Dictyocoryne Ehrenberg 1860AA05
    |    |--D. profundaAA05
    |    `--D. truncatumAA05
    |--Euchitonia Ehrenberg 1860 (see below for synonymy)AA05
    |    |--E. carcinusH04
    |    `--E. furcata Ehrenberg 1872BC98
    `--Flustrella Ehrenberg 1839 [=Trematodiscus Haeckel 1860; Trematodiscida]LT61
         |--*F. (Flustrella) concentrica Ehrenberg 1839 (n. d.)H15
         |--F. (Discospirella Loeblich & Tappan 1961) [=Discospira Haeckel 1862 non Morris in Mantell 1850]LT61
         |    `--F. (*D.) helicoides (Haeckel 1862) [=*Discospira helicoides]LT61
         `--F. (Perispirella Loeblich & Tappan 1961) [=Perispira Haeckel 1881 non Stein 1859]LT61
              `--F. (*P.) perispira (Haeckel 1887) [=Porodiscus perispira, F. (*Perispira) perispira]LT61

Euchitonia Ehrenberg 1860 [incl. Hymeniastrella Haeckel 1887, Hymeniastromma Haeckel 1887, Pteractis Ehrenberg 1872, Styla Stechow 1921, Stylactis Ehrenberg 1872; Euchitoniinae]AA05

*Type species of generic name indicated

References

[AA05] Afanasieva, M. S., E. O. Amon, Y. V. Agarkov & D. S. Boltovskoy. 2005. Radiolarians in the geological record. Paleontological Journal 39 (Suppl. 3): S135–S392.

[BC98] Bjørklund, K. R., G. Cortese, N. Swanberg & H. J. Schrader. 1998. Radiolarian faunal provinces in surface sediments of the Greenland, Iceland and Norwegian (GIN) Seas. Marine Micropalaeontology 35: 105–140.

[H04] Haeckel, E. 1899–1904. Kunstformen der Natur. Bibliographisches Institut: Leipzig und Wien.

[H15] Harmer, S. F. 1915. The Polyzoa of the Siboga ExpeditionPart I. Entoprocta, Ctenostomata and Cyclostomata. E. J. Brill: Leyden.

[LT61] Loeblich, A. R., Jr & H. Tappan. 1961. Remarks on the systematics of the Sarkodina (Protozoa), renamed homonyms and new and validated genera. Proceedings of the Biological Society of Washington 74: 213–234.

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