Abstract
Artystone bolivianensis n.sp. (lsopoda, Cymothoidae) from the body cavity of a Bolivian freshwater
fish, Otocinclus vestitus COPE, (Loricariidae) is described. The new species most closely resembles
Artystone minima THATCHER & CARVALHO, 1988, from the body cavity of Nannostomus beckfordi
GÜNTHER, (Lebiasinidae) from the upper Rio Negro of Brazil. Although the two species are of similar
size, the new species differs in having adult females that are about 25 % wider and more sparsely
pigmented. Males of the new species are slender but have a pleon that is wider in relation to the pereon
than is the case in males of the other species. The two species are from different host fish, representing
two unrelated families and they are from widely separated geographic areas.