Cessipyloroidea

Belongs within: Nassellaria.

The Cessipyloroidea are a group of radiolarians known from the Middle Ordovician to the Middle Triassic. They are characterised by a spherical test with a porous or spongy wall in the external shell and an inner frame in the shape of a hollow sphere or isometric polyhedron (Afanasieva et al. 2005).

<==CessipyloroideaAA05
    |--Aciferopylorum Nazarov & Ormiston 1990 [Aciferopyloridae]AA05
    |    `--*A. admirandum Nazarov & Ormiston 1993WBN02
    `--CessipyloridaeAA05
         |--CessipylorinaeAA05
         |    |--Fusalfanus Furutani 1990AA05
         |    |    `--F. konomoriensisAA05
         |    `--Cessipylorum Nazarov & Ormiston 1986AA05
         |         |--*C. insuetum (Nazarov 1975)WBN02
         |         |--C. apertum (Nazarov in Nazarov & Popov 1980)WBN02
         |         `--C. rimatum (Nazarov in Nazarov & Popov 1980)WBN02
         `--CaspiazinaeAA05
              |--Glomeropyle Aita & Bragin 1999AA05
              `--Caspiaza Afanasieva 1986AA05
                   |--C. aculeataAA05
                   |--C. calvaAA05
                   |--C. spiniferaAA05
                   `--C. urceusAA05

*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.

[WBN02] Won, M.-Z., R. B. Blodgett & V. Nestor. 2002. Llandoverian (Early Silurian) radiolarians from the Road River Formation of east-central Alaska and the new family Haplotaeniatumidae. Journal of Paleontology 76 (6): 941–964.