Original description as Platypoecilus xiphidium:
- Gordon, Myron. 1932. "Dr. Myron Gordon going on expedition". Aquatic Life. v. 15, pp. 287-288 (ffm00065)
Conservation: Xiphophorus xiphidium is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2018).