Eucyrtidium calvertense, from Hays (1970).

Belongs within: Eucyrtidioidea.

The Eucyrtidiinae are a group of radiolarians, known from the Triassic to the present, with three to ten segments and no specific cephalothorax (Afanasieva et al. 2005).

<==Eucyrtidiinae [Artophormida, Artophormidae, Artophormididae, Artophormidinae]AA05
    |--Artocyrtis Haeckel 1997AA05
    |--Artophormis Haeckel 1881AA05
    |--Clathropyrgus Haeckel 1881AA05
    |--Cyrtocapsella Haeckel 1887AA05
    |--Cyrtocapsoma Haeckel 1887AA05
    |--Cyrtophormiscus Haeckel 1887AA05
    |--Eusyringoma Haeckel 1887AA05
    |--Glomaria Sanfilippo & Riedel 1970AA05
    |--Immersothorax Dumitrica 1970AA05
    |--Lithomitrissa Haeckel 1887AA05
    |--Lithopera Ehrenberg 1847AA05
    |--Spirocyrtoma Haeckel 1887AA05
    |--Stichopodium Haeckel 1881AA05
    |--Stichopterygium Haeckel 1881AA05
    |--Syringium Principi 1909AA05
    |--Theocampe Haeckel 1887AA05
    |--Trocolocamptra Haeckel 1887AA05
    |--Acanthocyrtis Haeckel 1881AA05
    |    `--A. anthemis Haeckel 1887BC98
    |--Artocapsa Haeckel 1881 [Artocapsida]AA05
    |    `--A. ulbimaBL79
    |--Cyrtophormis Haeckel 1887AA05
    |    `--C. spiralisH04
    |--Lithocampe Ehrenberg 1838 [Lithocampida]AA05
    |    `--L. platycephala (Ehrenberg 1872)BC98
    |--Stychocorys Haeckel 1881 [Stichocorida, Stichoridae, Stichocorythidae]AA05
    |    `--S. seriata Jørgensen 1905BC98
    `--Eucyrtidium Ehrenberg 1847AA05
         |--E. calvertensePL80
         |--E. elongatumBC79
         |    |--E. e. elongatumBC79
         |    `--E. e. peregrinumBC79
         `--E. matuyamaiPL80

*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.

[BL79] Basov, V. A., B. G. Lopatin, I. S. Gramberg, A. I. Danjushevskaya, V. Ya. Kaban’kov, V. M. Lazurkin & D. K. Patrunov. 1979. Lower Cretaceous lithostratigraphy near Galicia Bank. Initial Reports of the Deep Sea Drilling Project 47: 683–717.

[BC79] Berggren, W. A., & J. A. Van Couvering. 1979. Quaternary. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A505–A543. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[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.

[PL80] Prothero, D. R., & D. B. Lazarus. 1980. Planktonic microfossils and the recognition of ancestors. Systematic Zoology 29 (2): 119–129.

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