From Suzuki Paleotax db:
2015 Arachnocorallium cerebellum n. sp Renaudie & Lazarus p. 192, pl. 5, figs. 1-2, 13, 16A-B
Catalog entries: Arachnocorallium cerebellum
Original description: Description
Shell consists only in a cephalis which is in two distinct parts: a large, spherical, almost globular upper part that bears regularly arranged, relatively large circular pores and whose wall is rough and crested and a more or less conical, narrow lower part with a few large circular pores and a rather smooth wall. Spine A is embedded in the wall of the lower and the upper part and eventually, in some specimens, protrudes as a fairly long conical spine (Pl. 5, fig. 2). Spines D, Ll and Lr are rather strong, relatively long and bifurcate distally. Ax can be seen near the junction of MB, Ll and Lr as a triangular dent on MB. Several supplementary thin, long, conical horns can also be present subapically.
Remarks
It differs from Peridium sphaerum Funakawa, 1995b in the presence of the long by-spines and in the robustness, length and shape of the basal spines. It is also distinguishable from the specimen illustrated in Petrushevskaya (1971) as Lophophaeninae gen. sp. cf. Micromelissa coarctata Rüst, 1888 by its size, its numerous, larger pores and the additional spines being confined to the apical part of the cephalis. Psilomelissa? sp. A Hollis, 2002 is lacking an apical horn, has longer, tribladed D, Ll and Lr spines and lacks the basal constriction of the cephalic chamber.
Geological Range:
Last occurrence (top): within Zanclean Stage (3.60-5.33Ma, top in Zanclean stage). Data source:
First occurrence (base): within Zanclean Stage (3.60-5.33Ma, base in Zanclean stage). Data source:
Plot of occurrence data:
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Arachnocorallium cerebellum compiled by the radiolaria@mikrotax project team viewed: 20-8-2026
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