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a new species of heterocotyle scott, 1904 (monogenea: monocotylidae) from the gills of dasyatis guttata (dasyatidae) in southwestern atlantic waters off rio de janeiro, brazil.heterocotyle sulamericana n. sp. is described from the gills of dasyatis guttata (bloch & schneider) caught off the coast of brazil near rio de janeiro. this species can be distinguished from all other members of heterocotyle scott, 1904 by a combination of the morphology of the male copulatory organ, which is a short, slightly curved, sclerotised tube with no accessory piece, and the haptor, which has a single ridge surmounting all septa. this is the first heterocotyle species to be described f ...201222139010
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