Ruzhencevispongus plumatus, from Afanasieva et al. (2005).

Belongs within: Stauraxonaria.

The Pyramidata are a group of radiolarians known from the Carboniferous to the Cretaceous (Afanasieva et al. 2005).

Characters (from Afanasieva et al. 2005): External shells with spongy wall, with convex skeleton, pyramidal or flattened-pyramidal, less commonly subspherical in shape (approximate tetragon or cube). Inner frame in shape of hollow sphere with three to six rays, connected to external terminal spines.

    |    |--Latentidiota Nazarov & Ormiston 1985 [Latentidiotinae]AA05
    |    |    |--L. semilaminaAA05
    |    |    `--L. visendaAA05
    |    `--RuzhencevisponginaeAA05
    |         |--Foremanhelena De Wever & Caridroit 1984AA05
    |         `--Ruzhencevispongus Kozur 1980AA05
    |              |--R. cataphractusAA05
    |              `--R. plumatusAA05
    |    |--RectotormentinaeAA05
    |    |    |--Rectotormentum Nazarov & Ormiston 1985AA05
    |    |    `--Octatormentum Nazarov & Ormiston 1985AA05
    |    `--TormentinaeAA05
    |         |--Grandetortura Sashida & Tonishi 1991AA05
    |         |--Pseudolithelius Kozur & Mostler 1989AA05
    |         |--Staurentactinia Schwartzapfel & Holdsworth 1996AA05
    |         |--Tetraspongoactinia Won 1998AA05
    |         |--Tetratormentum Nazarov & Ormiston 1983AA05
    |         `--Tormentum Nazarov & Ormiston 1983AA05
    |              `--T. circumfusumAA05
       |    |--Cavidiscus Pessagno 1976AA05
       |    |--Cavaspongia Pessagno 1973AA05
       |    `--Dumitricaia Pessagno 1976AA05
       |         `--D. sphaericaAA05
            |--Discokatorella Kozur & Mostler 1994AA05
            |--Intermediella Lahm 1984AA05
            |--Katorella Kozur & Mostler 1981AA05
            |--Kulacella Kozur & Mostler 1981AA05
            |--Neopaurinella Kozur & Mostler 1981AA05
            |--Paurinella Kozur & Mostler 1981AA05
            |--Rikivatella Kozur & Mostler 1981AA05
            |--Triassospongosphaera Kozur & Mostler 1981AA05
            `--Pyramispongia Pessagno 1973 [incl. Nodotetraedra Steiger 1992]AA05
                 `--P. barmsteinensisAA05

*Type species of generic name indicated


[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.

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