Original description as Cichlasoma pasionis:
- Rivas, Luis Rene. 1962. "Cichlasoma pasionis, a new species of cichlid fish of the Thorichthys group, from the Rio de la Pasion, Guatemala". Quarterly Journal of the Florida Academy of Science. 25(2):147-156 (ffm00275)
Conservation: Thorichthys pasionis is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2018). Not listed in the Mexican Official Norm NOM-059-ECOL-2001 with any degree of protection. Although faced with pollution in part of its range, most of it remains relatively stable.