Coccodiscilae

Cannartus laticonus, from here.

Belongs within: Stauraxonaria.

The Coccodiscilae are a group of radiolarians with the inner part of the skeleton composed of a flattened double medullary shell, and a large space between the inner medullary and the outer latticed shell.

The Lithocyclia lineage of radiolarians originated in the middle Eocene with discoidal forms (Lithocyclia) that later evoleved into ellipsoidal forms (Cannartus and Ommatartus).

<==Coccodiscilae [Cenodiscilae]LT61
    |--CenodiscidaH04
    |    |--Cenodiscus Haeckel 1887AA05
    |    `--Trochodiscus Haeckel 1887H04, AA05
    |         `--T. stellarisH04
    `--Coccodiscidae [Coccodiscinae, Phacodiscida, Phacodiscidae]AA05
         |--Astrophacus Haeckel 1881AA05
         |--Coccocyclia Haeckel 1881AA05
         |--Coccodiscus Haeckel 1862AA05
         |--Heliosestrum Haeckel 1881AA05
         |--Heliostylus Haeckel 1881AA05
         |--Periphaena Ehrenberg 1873AA05
         |--Phacodiscus Haeckel 1881AA05
         |--Phacostaurus Haeckel 1881AA05
         |--Phacostylus Haeckel 1881AA05
         |--Trigonactum Haeckel 1881AA05
         |--Sethostylus Haeckel 1881AA05
         |--Heliodrymus Haeckel 1881H04, AA05
         |    `--H. dendrocyclusH04
         `--Lithocyclia Ehrenberg 1847AA05
              |--L. ocellusP98
              `--+--L. aristotelisP98
                 `--+--L. angustaP98
                    `--ArtiscinaeAA05
                         |--Cypassis Haeckel 1887 [incl. Astromma Ehrenberg 1847 (nom. inv.)]AA05
                         |--Diartus Sanfilippo & Riedel 1980AA05
                         |--Spongoliva Haeckel 1887AA05
                         |--Artiscus Haeckel 1881AA05
                         |--Didymocyrtis Haeckel 1862AA05
                         |    `--D. tetrathalamusAA05
                         `--Cannartus Haeckel 1881P98, AA05
                              |--C. tubariusP98
                              `--+--C. violinaP98
                                 `--+--C. mammiferusP98
                                    `--+--C. laticonusP98
                                       |--+--‘Ommatartus’ hughesiP98
                                       |  `--C. petterssoniP98
                                       `--Ommatartus Haeckel 1881AA05
                                            |--O. antepenultimusP98
                                            `--+--O. penultimusP98
                                               `--+--O. avitusP98
                                                  `--O. tetrathalamusP98

*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.

[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.

[P98] Prothero, D. R. 1998. Bringing Fossils to Life: An introduction to paleobiology. WCB McGraw-Hill: Boston.

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