''Rhamdia zongolicensis'' (common name: Zongolica catfish) is a species of
three-barbeled catfish
The Heptapteridae, or three-barbeled catfishes, are a family of catfish that originate from the Americas. Most species are restricted to South America, but '' Imparfinis lineatus'', '' Nemuroglanis panamensis'' and '' Pimelodella chagresi'' are ...
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to
Mexico
Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...
.
Its
specific name refers to
Zongolica
Zongolica is a municipality located in the south zone in the State of Veracruz, about 100 km from state capital Xalapa. It has a surface of 63.34 km2. It is located at . The name comes from Nahuatl ''Tzontli-coliuhqui'' 'crafty hair'.
...
, the area in
Veracruz
Veracruz (), formally Veracruz de Ignacio de la Llave (), officially the Free and Sovereign State of Veracruz de Ignacio de la Llave ( es, Estado Libre y Soberano de Veracruz de Ignacio de la Llave), is one of the 31 states which, along with Me ...
state where it occurs. It is a
cave fish
Cavefish or cave fish is a generic term for fresh and brackish water fish adapted to life in caves and other underground habitats. Related terms are subterranean fish, troglomorphic fish, troglobitic fish, stygobitic fish, phreatic fish and hypog ...
similar to ''
Rhamdia laticauda'' and ''
Rhamdia reddelli'',
and at times considered a
junior synonym
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently.
* In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linna ...
of the former.
Habitat
''Rhamdia zongolicensis'' is only known to occur in a single cave, Cueva del Túnel (Cueva del Ostoc), where it lives in stagnant pools.
Description
''Rhamdia zongolicensis'' grows to at least about standard length
Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology.
Overall length
* Standard length (SL) is the length of a fish m ...
. It is related to the surface-dwelling '' Rhamdia laticauda'', considered to be its sister species
In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree.
Definition
The expression is most easily illustrated by a cladogram:
Taxon A and t ...
. Because the surface species is nocturnal, and thereby adapted to darkness, the cave species shows only few new adaptations: elongated barbels and extreme ability to withstand starvation (at least seven months under experimental conditions). It also shows reduced pigmentation and smaller eyes.convergent evolution
Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last com ...
.
References
{{Taxonbar, from=Q5463580
Heptapteridae
Cave fish
Freshwater fish of Mexico
Endemic fish of Mexico
Taxonomy articles created by Polbot
Fish described in 1993
Fauna of the Sierra Madre de Oaxaca