Cenozoic Spumellarian Radiolaria With Eccentric Microsphere Author Dumitrica, Paulian Institute of Earth Sciences, Université de Lausanne, Géopolis, 1015 Lausanne, Switzerland; mailing address: Dennigkofenweg 33, 3073 Gümligen, Switzerland Paulian.Dumitrica@unil.ch text Acta Palaeontologica Romaniae 2019 2019-04-25 15 1 39 60 http://dx.doi.org/10.35463/j.apr.2019.01.04 journal article 286841 10.35463/j.apr.2019.01.04 263c05ec-d532-47d6-8efc-b5f48edb86b1 1842-371x 10520604 57C54916-CC13-4BA1-BA82-2A99A822D9D1 Excentrodiscus kamikurii nov. sp Figures 9f, g cf. 2015 Excentrodiscus aff. oculatus (Ehrenberg) . – Kamikuri, p. 148, pl. 15, figs. 3, 4, 6, 8. Description . Microsphere very small, eccentrical, with 8- 10 wide polygonal pores interconnected to outer medullary shell through 8-10 very thin beams of various length depending of their position in shell. Outer medullary shell spherical, rather thin and latticed with polygonally framed circular pores. Intervening bars thin, triangular in transverse section. Cortical shell spherical, rather thin-walled with numerous circular pores. Intervening bars thin with sharp crests and short and thin by-spines at vertices. Cortical shell bears 8-10 needle shaped spines about as long as skeleton ray. These spines are originated either in the microsphere or in the wall of the outer medullary shell, no one in the cortical shell. Material . One specimen in sample DODO 123 D. Holotype . The illustrated specimen, individual slide, coll. MGL 103563 … Dimensions . Diameter of microsphere 16-17 μm, of outer medullary shell 57 μm, of cortical shell 125 μm. Etymology . The species is named for Dr. Shin-ichi Kamikuri, Ibaraki University, Japan , for his contribution to the knowledge of Cenozoic radiolarians and for having illustrated some specimens of Eocene Excentrodiscus . Remarks . Shell of this species resembles the shell of the co-occurring species in sample DODO 123D from which it differs in having radial spines. It resembles very much the Recent species Excentrodiscus echinatus Hollande & Enjumet from the Gulf of Alger in shape and size of shells from which it only differs in having a smaller number and shorter spines. The specimens illustrated by Kamikuri (2015) as Excentrodiscus aff. oculatus (Ehrenberg) are rather similar to this new species from whom they differ especially in having shorter spines. Range and occurrence . Middle? Eocene of Indian Ocean.