Dactylogyrus robisoni n. sp. is described from the bluehead shiner, Pteronotropis hubbsi (Bailey and Robison), 1978, in Arkansas, U.S.A. Dactylogyrus robisoni is morphologically most similar to Dactylogyrus moorei Monaco and Mizelle, 1955, and Dactylogyrus ornatus Rogers, 1967, by possessing a long, slender, often sinuous copulatory accessory piece. The accessory piece of D. robisoni differs from those of the other 2 species by lacking a medial ramus and terminating in an elongate bulb.
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Vol. 78 • No. 1