A new and morphologically distinct population of cavernicolous Poecilia mexicana (Poeciliidae: Teleostei)
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- Tobler, M., Riesch, R., García de León, F.J. et al. Environ Biol Fish (2008) 82: 101. doi:10.1007/s10641-007-9258-x
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The cave molly, Poecilia mexicana, from the Cueva del Azufre, a sulfur cave in Tabasco, Mexico, ranks among the best-studied cave fishes worldwide, despite being known from a single population only. Here we describe a newly discovered second population of cave-dwelling P. mexicana from a nearby, but mostly non-sulfidic cave (Luna Azufre). Despite apparent similarities between the two populations (such as reduced eye diameter and reduced pigmentation), a geometric morphometric analysis revealed pronounced morphological differentiation between the two cave forms.