Río Acatlán, Puebla, México, and the suffix "-ensis" denotes a location of origin. The reason for the genus name Astyanax was not made clear in the original literature, but the name itself originates from the Iliad, a famous Greek epic poem; Astyanax was a Trojan prince, the son of famed warrior Hector. Astyanax acatlanensis is not widely known under a particular common name, but is usually referred to as the Acatlán tetra, given its type locality. Distribution and habitat Given its recent addition to the genus, the range of A. acatlanensis has not been studied extensively. As of its nomination, it was only known from the Río Acatlán, which is its type locality, and the Río Jía, another Mexican river. The Río Acatlán is also sometimes called the Tizaa or Tizaac river, depending on location, and is considered to occupy its own sub-basin. Tizaa is a word from the Mixtec language that means "river on fire", but literature on the environment of the river itself is lacking. The locale of the specimens collected from the Río Jía is described as "1.5 mi (2.4 km) W of Guelatao, Oaxaca, Mexico", but literature regarding the Río Jía is otherwise sparse. Diet and ecology While little is known about the diet of A. acatlanensis in particular, other members of the genus located further South demonstrate primarily herbivorous leanings and the occasional omnivorous trait. The most common food items appear to be algae, terrestrial plants, and fallen fruits and seeds. Astyanax acatlanensis is known to be amongst prey items in the diet of the neotropical otter (Lontra longicaudis), specifically in the southern Tehuacán-Cuicatlán Biosphere Reserve of Mexico. Conservation status Upon evaluation by the IUCN, A. acatlanensis was categorized as data deficient. Without more extensive knowledge of population levels, ecological threats, and potential anthropogenic hazards, there is no way to determine whether or not A. acatlanensis is in a sustainable position as a species. However, general study of Mexico's rivers has revealed extensive human activity that not only threatens the ecology of various regions but is also a potential health hazard to the many towns and cities that rely on the Mexican watershed for resources. Nonetheless, A. acatlanensis is known to be a hardy species that can tolerate various pollutants. References Fish described in 2017 acatlanensis Fish of Central America Fish of Mexico IUCN Red List data deficient species