Euryalid brittle stars from the International Indian Ocean Expedition 1963 - 64 (Echinodermata: Ophiuroidea: Euryalida) Author Baker, Alan N. Author Okanishi, Masanori Author Pawson, David L. text Zootaxa 2018 2018-03-08 4392 1 1 27 journal article 28700 10.11646/zootaxa.4392.1.1 6251bf04-bedf-44cf-92b2-73e551eb56f6 1175-5326 1194434 B6A80A66-E868-4578-A5E5-655E0F18AA84 Family Asteronychidae Verrill, 1899 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.