Abstract
Electrophoretic analyses were performed on blood proteins of the five members of the Notropiscornutus species group. The protein systems included two plasma esterases, transferrin, a pre-albumin and hemoglobin. Plasma protein polymorphism within and between taxa was common. Hemoglobin appeared to be a more consistent and conservative character for assessing phylogenetic relationships. As deduced by both biochemical and morphological evidence, N. cerasinus is the most primitive member of the species group. Uniqueness for several biochemical characters suggests that the striped shiner should be afforded full species recognition as N. isolepis but additional study is needed concerning its relationship with N. cornutus chrysocephalus. The closest biochemical similarity was between the forms interpreted here as subspecies N. cornutus cornutus and N. c. chrysocephalus. N. albeolus clearly evolved from N. c. cornutus but early hybridization with N. cerasinus resulted in limited introgression from that species.
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