Amphiplecta acrostoma, from Haeckel (1887).

Belongs within: Archipilioidea.

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

Characters (from Afanasieva et al. 2005): Two segments. Porous eucephalic chamber egg-shaped, narrowing basally. Subsidiary lobes fused with thorax. Arcs ap extending obliquely, separating eucephalic chamber from remaining skeleton. Collar strictum not sharp. Processes p and spines A and V extending as ridges and appear as thorns on sides of cephalis. Spine V not stabilized. Axobate developed weakly. When thorax developed, it is wide, conical, longer and wider than cephalis. Wall porous or cellular. Aperture widely open.

<==Lophophaeninae [Lophophaenidae]AA05
    |--Acanthocoronium Haeckel 1887AA05
    |--Cephaluspinus Alvira Martin 1971AA05
    |--Arachnocorallium Haeckel 1887AA05
    |--Marimoum Funakawa 1994AA05
    |--Syscioscenium Sugiyama 1992AA05
    |--Thetis De Wever 1982AA05
    |--Tripodocyrtis Funakawa 1994AA05
    |--Dictyocryphalus Haeckel 1887AA05 [=Dictyocephalus Ehrenberg 1861 non Leidy 1857LT61, AA05, DictiocephalusLT61]
    |    `--*D. obtusus (Ehrenberg 1861) [=*Dictyocephalus obtusus]LT61
    |--‘Ovum’ De Wever 1982 non de Blainville 1830AA05
    |    `--O. pertusum de Wever 1982DZ03
    |--Lophophaena Ehrenberg 1847AA05
    |    |--L. ehrenbergiiAA05
    |    `--L. rioplatensisAA05
    `--Amphiplecta Haeckel 1881AA05
         |--A. acrostoma Haeckel 1887BC98
         `--A. cylindrocephalaAA05

*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.

[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.

[DZ03] Dumitrica, P., & P. Zügel. 2003. Lower Tithonian mono- and dicyrtid Nassellaria (Radiolaria) from the Solnhofen area (southern Germany). Geodiversitas 25 (1): 5–72.

[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.

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