02356naa a2200217 a 450000100080000000500110000800800410001902400520006010000210011224502620013326000090039552015160040465000310192065000200195165000140197165000230198565000210200870000210202970000190205077300690206921098582019-11-18       2019    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1007/s11230-019-09862-y2DOI1 aNEGREIROS, L. P.  aMonogeneans of the catfish Pimelodus blochii Valenciennes (SiluriformesbPimelodidae) from the Brazilian Amazon, with a description of a new species of Ameloblastella Kritsky, Mendoza-Franco & Scholz, 2000 (Monogenea: Dactylogyridae).h[electronic resource]  c2019  aAmeloblastella amazonica n. sp. (Monogenea: Dactylogyridae) collected on the gills of Pimelodus blochii Valenciennes (Siluriformes: Pimelodidae) from Rivers Acre and Iaco, State of Acre (Brazil) is described. The new species differs from the congeners mainly by the morphology of the dorsal bar, i.e. slightly U-shaped bearing a posteriorly directed flap, arising from the anterior edge of its middle third. The most morphologically similar congeners, A. paranaensis (França, Isaac, Pavanelli & Takemoto, 2003) and A. satoi Monteiro, Kritsky & Brasil-Sato, 2010, resemble A. amazonica n. sp. regarding the general structure of the copulatory complex; however, besides other features, they also differ from the new species because their hooks are similar in size (vs hooks with three different sizes). In addition to the dorsal bar lacking a flap, A. amazonica n. sp. can be differentiated from all congeners based on the combination of the following features: size of hooks (one or two different sizes), shape of the dorsal bar (other than slightly U-shaped), anchor points largely passing the level of superficial root (vs not or slightly passing it), number of MCO rings (other than 3?4) and structure of the articulation between the MCO base and the accessory piece (other than thick, medium-sized, smooth and tubular). Demidospermus leptosynophallus Kritsky & Gutierrez, 1998 and Scleroductus yuncensi Jara & Cone, 1989 were also found infesting P. blochii, both representing new host and locality records.  aAnimal parasites and pests  aAnimal taxonomy  aParasites  aParasito de Animal  aTaxonomia Animal1 aTAVARES-DIAS, M.1 aPEREIRA, F. B.  tSystematic Parasitologygv. 96, n. 4-5, p. 399-0406, June, 2019.