Theraps

Theraps is a genus of cichlid fish that includes only a single species, the Arroya cichlid (Theraps irregularis) from fast-flowing rivers and streams in the Usumacinta and Polochic basins of southern Mexico and Guatemala.^[1][2] It is a medium-sized cichlid, up to 19 cm (7.5 in) in standard length.^[3]

Theraps
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Cichliformes
Family:	Cichlidae
Genus:	Theraps Günther, 1862
Species:	T. irregularis
Binomial name
Theraps irregularis Günther, 1862

Taxonomy

Historically, Theraps was included in Cichlasoma. Once recognized as its own genus, it sometimes included a wide range of species now known to belong in other genera, including Cincelichthys, Chortiheros, Chuco, Cryptoheros, Kihnichthys, Oscura, Paraneetroplus, Rheoheros, Talamancaheros, Tomocichla and Wajpamheros. In a major review of 2015, only five species remained in this genus,^[4] but in 2016 it was shown that four of these were not close relatives of the Theraps type species, T. irregularis, resulting in them being moved to Chuco and Wajpamheros.^[2] As a consequence, Catalog of Fishes now recognizes Theraps as only including the type species,^[5] and as of 2023^[update] FishBase agrees.^[3]