Dimelissinae

Lithomelissa cf. setosa, copyright John Dolan.

Belongs within: Archipilioidea.

The Dimelissinae are a group of radiolarians known from the Palaeogene to the present (Afanasieva et al. 2005).

Characters (from Afanasieva et al. 2005): Ellipsoidal eucephalic chamber with porous or cellular walls, not narrowing basally. Arcs ap are raised and not lying at base of cephalis. Collar strictum not sharp. Spine V may be fused with one of spines L. Axobate developed weakly. When thorax present, it is somewhat wider than cephalis, but not longer. Aperture open or closed sac-like.

<==DimelissinaeAA05
    |--Acromelissa Haeckel 1881AA05
    |--Archiperidium Haeckel 1887AA05
    |--Dicorys Popofsky 1913AA05
    |--Dimelissa Campbell 1951AA05
    |--Lophophaenoma Haeckel 1887AA05
    |--Psilomelissa Haeckel 1881AA05
    |--Arachnocorys Haeckel 1860AA05
    |    `--A. circumtextaAA05
    |--Phormacantha Jorgensen 1905AA05
    |    `--P. hystrix (Jørgensen 1900)BC98
    `--Lithomelissa Ehrenberg 1847AA05
         |--L. hystrix Jørgensen 1900BC98
         |--L. setosa Jørgensen 1900BC98
         |--L. stigi Bjørklund 1976BC98
         `--L. thoracites Haeckel 1862BC98

*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.

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