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

Five specimens of Ophiuroidea from deep-sea seamounts in the West Pacific were collected and identified as two species, and . The new species, , can be distinguished from its congeners by having indistinct or underdeveloped oral papillae, relatively short genital slits, crescent-shaped lateral arm plates, and plate-shaped external ossicles on the aboral surface of the disc. One specimen was identified as , which has been reported in the north-western Pacific and the north-eastern coast of Japan. The most recent tabular key of was revised with two more key characteristics added, the shape and presence of oral papillae and the number of arm spines. The phylogenetic relationship of and was analyzed based on 16S and COI sequences. The discovery of the two species further expanded the geographical distribution of the genus .