Myxobolus sp. cf. angustus Kudo, 1934 (Cnidaria: Myxosporea: Myxobolidae) on the Gills of Dionda sp. cf. flavipinnis (Cope) (Cypriniformes: Cyprinidae) from the South Concho River, Texas

Abstract

An undescribed species of roundnose minnow,Diondasp. cf.flavipinnis(Cope), is asmall endemic cyprinid that inhabits northern tributaries (San Saba and upper Concho rivers) ofthe Colorado River drainage in southcentral Texas. Nothing is known of the protistan or metazoanparasites of this fish.Therefore, we examined a small sample of this minnowfrom the South ConchoRiver for parasites. One species of myxozoan, morphometrically very similar toMyxobolus angustusKudo, 1934, was found on the gills of one of four (25%)D.sp. cf.flavipinnis; no other parasiteswere found.As such,this is the first time any parasite has been reported from this fish and representsa new host and geographic record for a myxozoan from this endemic species.