Herichthys carpintis
Herichthys carpintis, the lowland cichlid, pearlscale cichlid, is a species of cichlid. Taxonomy 
It is related to the Texas cichlid, with which it forms viable hybrid offspring. These hybrids are an invasive species in Louisiana. Distribution and habitat. It is endemic to eastern Mexico where it occurs in the Pánuco River drainage, and the Soto La Marina River in northeastern Mexico, its type locality is the Laguna del Carpinte, near Tampico in Tamaulipas, which is alluded to in the specific name. Description 
It reaches a maximum size of  SL. It is popular in the aquarium trade. References

carp
Endemic fish of Mexico
Freshwater fish of Mexico
Natural history of San Luis Potosí
Natural history of Tamaulipas
Cichlid fish of North America
Fish described in 1899
Pánuco River
Taxa named by David Starr Jordan