Lactate dehydrogenase isozymes, malate dehyrogenase isozymes and tetrazolium oxidase mobilities of darters (etheostomatini)

1. 1. Lactate dehydrogenase isozyme patterns were obtained for sixty-seven species of darters, tetrazolium oxidase electrophoretic mobilities for sixty-eight species and malate dehydrogenase isozyme patterns for fifty-seven species. 2. 2. The patterns and mobilities supported perviously assumed monophyletic origins for the genera Percina and Etheostoma. 3. 3. Several accepted relationships among darters were supported, and new relationship were suggested. 4. 4. Geographic variation was limited; the most significant variation was the dichotomous nature of the LDH pattern of P. copelandi suggesting that the nominal species may actually consist of two or more taxonomically recognizable forms.