Axel Weber, Horst Wilkens, Rhamdia macuspanensis: A New Species of Troglobitic Pimelodid Catfish (Siluriformes; Pimelodidae) from a Cave in Tabasco, Mexico, Copeia, Vol. 1998, No. 4 (Dec. 30, 1998), pp. 998-1004
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Weber et al. (1998) studied this question.
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