Pylonioidea

Pylodiscus triangularis, from Haeckel (1887).

Belongs within: Stauraxonaria.

The Pylonioidea are a group of radiolarians known from the Late Cretaceous (Cenomanian) to the present. The skeleton, at least in the early stages, is fenestrated and built by systems of girdles in successively turned or perpendicular planes (Afanasieva et al. 2005).

<==PylonioideaAA05
    |--Miropyle Dumitrica 1988 [Miropylidae]AA05
    `--PyloniidaeAA05
         |  i. s.: Trizonium Haeckel 1887 [=Echinosphaera Hertwig 1879 non Angelin 1878, Trizonites Haeckel 1887]LT61
         |           `--*T. datura (Hertwig 1879) [=*Echinosphaera datura, *Trizonites datura]LT61
         |--Palaeotetrapyle Dumitrica 1988 [Palaeotetrapylinae]AA05
         |--Dipylissa Dumitrica 1988 [Dipylissinae]AA05
         |--PyloniinaeAA05
         |    |--Octopyle Haeckel 1881AA05
         |    |--Pylonium Haeckel 1881AA05
         |    |--Tetrapyle Mueller 1858AA05
         |    `--Larcospira Haeckel 1887AA05
         |         `--L. minor (Jørgensen 1900)BC98
         `--Pylodiscinae [Pylodiscida]AA05
              |--Hexapyle Haeckel 1881AA05
              |--Larcopyle Dreyer 1889AA05
              |--Pylolena Haeckel 1887AA05
              `--Pylodiscus Haeckel 1887AA05
                   `--P. triangularisH04

*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.

[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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