proriger, Xenisthmus Snyder [J. O.] 1908:105 [Proceedings of the United States National Museum v. 35 (no. 1635); ref. 4150] Tidepool at Naha, Okinawa Island, Ryukyu Islands, Japan. Holotype: USNM 62242. Paratypes: CAS-SU 21108 (3, one without head). Type catalog: Koumans 1940:127, 145 [ref. 2676], Böhlke 1953:119 [ref. 12291]. •Synonym of Xenisthmus clarus (Jordan & Seale 1906) -- (Hoese 2006:1700 [ref. 28998]). •Mention -- (Gill & Hoese 2004:242 [ref. 27774]). Current status: Synonym of Xenisthmus clarus (Jordan & Seale 1906). Xenisthmidae. Habitat: marine.