CryptocotyleCryptocotyle is a genus of trematodes from the family Heterophyidae. The definitive hosts of the parasites are fish-eating birds and mammals. The metacercariae are visible in the skin of infected fish as "black spots".SpeciesCryptocotyle americana Ciurea, 1924Cryptocotyle badamshini Cryptocotyle concava Cryptocotyle cryptocotyloides Cryptocotyle delamurei Cryptocotyle jejuna Cryptocotyle lingua ''Cryptocotyle macrorhinis''