Rediscriptions and original figures of the trematodes Koellikeria fili
collis and K. shimai, parasites of sae breams (Brama brama, B. japonic
a) from the Pacific with the data on localization and distribution of
these species, have been given. K. filicollis is a very polymorphic fo
rm, which changes during its development. Didymozoon shimai Pozdflyako
v, 1985 is transfered to the genus Koellikeria.