arctum, Siphostoma Jenkins [O. P.] & Evermann [B. W.] 1889:137 [Proceedings of the United States National Museum v. 11 (no. 698); ref. 2342] Guaymas Bay, Sonora, Gulf of California, western Mexico. Holotype (unique): USNM 39639. •Valid as Bryx arctus (Jenkins & Evermann 1889) -- (Fritzsche 1980:195 [ref. 1511], Eschmeyer & Herald 1983:130 [ref. 9277]). •Valid as Cosmocampus arctus (Jenkins & Evermann 1889), subspecies arctus -- (Thomson et al. 2000:67 [ref. 25640]). •Valid as Cosmocampus arctus (Jenkins & Evermann 1889) -- (Dawson 1985:48 [ref. 6541], Allen & Robertson 1994:97 [ref. 22193], De La Cruz Agüero et al. 1997:292 [ref. 24545], Grove & Lavenberg 1997:287 [ref. 24023], Chirichigno F. & Vélez D. 1998:102 [ref. 24555], Nelson et al. 2004:111 [ref. 27807], Love et al. 2005:71 [ref. 37547], Kuiter 2009:235 [ref. 30404], Page et al. 2013:114 [ref. 32708], Hamilton et al. 2016:Supplement 1 [ref. 35615], Kells et al. 2016:124 [ref. 35888], Burton & Lea 2019:56 [ref. 37205], Love et al. 2021:102 [ref. 39279], Grove et al. 2022:18 [ref. 41326], Page et al. 2023:118 [ref. 40505]). Current status: Valid as Cosmocampus arctus (Jenkins & Evermann 1889). Syngnathidae: Syngnathinae. Distribution: Eastern Pacific: northern California (U.S.A.) south to Mazatlan (Mexico), including Gulf of California (Mexico). Habitat: marine.