Euryalid brittle stars from the International Indian Ocean Expedition 1963 - 64 (Echinodermata: Ophiuroidea: Euryalida) Baker, Alan N. Okanishi, Masanori Pawson, David L. Zootaxa 2018 2018-03-08 4392 1 1 27 7NG2P Verrill, 1899 Verrill 1899 [246,596,1612,1638] Ophiuroidea Asteronychidae Animalia Euryalida 6 7 Echinodermata family   Diagnosis.Arms simple, coiled. Disc five lobed or circular, covered with skin and/or plate-shaped external ossicles. Teeth spiniform, covering whole side of jaw. Radial shields narrow, multi-layered. Ventral arm plates limited to a few basal arm segments. Up to more than ten arm spines. Genital slits usually small, half the length of the height of the disc.