Key to Mexican Etheostoma (Oligocephalus).
Norris, S.M. and W.L. Minckley 1997. Two new species of Etheostoma (Osteichthyes: Percidae) from Central Coahuila, Northern Mexico. Ichthyol. Explor. Freshwat. 8(2):159-176. Ref No [26684] Key No. [1131]






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