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Specimens of   Rhabdochona  ( Rhabdochona )  acuminata   (Molin, 1860) were collected in   Astyanax   aff.   fasciatus   (Cuvier, 1819) from Lake Guaíba, municipalities of Guaíba (  30°08.28'S, 51°18.53'W  ) and Barra do Ribeiro (  30°17.11'S, 51°18.01'W  ), southern Brazil. In the present study, the prevalence of   R.  ( R. )  acuminata   was low (1.43%) when compared to other studies performed with    Astyanax    spp. from Brazil. The specimens of   R.  ( R. )  acuminata   showed some morphological differences (mainly the deirids) that have not yet been reported for the species. This is the first report of   R.  ( R. )  acuminata   from Lake Guaíba, filling a gap of occurrence of this nematode in South America.

neotropical biology and conservation

First report of    Rhabdochona   acuminata    (  Nematoda  ,   Rhabdochonidae  ) in   Astyanax   aff.   fasciatus   (  Characiformes  ,   Characidae  ) from Lake Guaíba, southern Brazil