Description of two species of the genus Astrodia Verrill, 1899 (Ophiuroidea, Euryalida, Asteronychidae), including a new species from seamounts in the West Pacific

Morphological characters of Astrodia duospina sp. nov. (holotype: RSIO61068) A aboral view of the disc B periphery of the aboral disc C oral view of the disc D genital silts E aboral view of the arms F arms spines. Abbreviations: RS radial shield; PO plate-shaped ossicle; M madreporite; T teeth; OT oral tentacle; GS genital slit; G gonad; LAP lateral arm plate; AS arm spine. Scale bars: 2 mm (A, C, E); 1 mm (B, D); 0.5 mm (F).