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The Atlantic molly, or cave molly, is a small, freshwater livebearing fish that feeds on invertebrates and, in sunlit environments, algae. Its range extends from northeastern Mexico down through Central America (Tobler et al, 2008). P. mexicana has undergone a divergent shift between sub-populations in terms of environmental preferences: while most of the species resides in tropical streams and stream pools, distinct populations have colonized cave environments and undergone shifts in morphology and behavior (Menzel and Darnell, 1973).


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