Original description as Xiphophorus gracilis:
ZooBank:284E1A2E-2FB4-4284-9A2E-2C0265F4F5FB.
- Heckel, Johann Jakob. 1848. "Eine neue Gattung von Poecilien mit rochenartigem Anklammerungs-Organe". Sitzungsberichte der Gesellschaft naturforschender Freunde in Berlin. 1:289-303 (ffm04582)
Synonyms (1):
- Gambusia heckeli Bleeker, 1860, with type locality at Orizaba, Mexico. Determiner: Rosen & Bailey, 1963
Conservation: Poeciliopsis gracilis is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2019).