Therodamas tamarae n.sp . is described based on females removed from branchial filaments of Plagioscion squamosissimus (Teleostei, Sciaenidae) caught in a lake near the Araguaia River, State of Goias, Brazil . The new species shares with Therodamas elongatus (Thatcher, 1986) the same host, a similar reaction from the host to the presence of the parasites, and the same general shape of body ; in addition, the two species are from the Amazon basin . On the other hand, it resembles T fluviatilis Paggi, 1976 in the structure of legs 1 to 4 . An identification key for Therodamas species, as well as comments on the distribution of the species, are included .
Four new species of Acusicola are described based on adult females found on gill filaments of several species of coastal and freshwater fishes caught in Brazilian basins . The distribution area of the genus in Brazil is significantly enlarged, since until now the previous Brazilian species had been known only from Amazonian fishes . The specimens identified as Acusicula tenax by Cressey and Collette (1970) are considered representatives of a new species, A . rogeri . A key for identification of the species of Acusicola is provided .
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