Resolution of cryptic species complexes within the genus Metagonimus (Trematoda: Heterophyidae) in Japan, with descriptions of four new species

Minoru Nakao, Takanori Ishikawa, Yusuke Hibino, Yuma Ohari, Rintaro Taniguchi, Tomohiro Takeyama, Shingo Nakamura, Wataru Kakino, Hiromi Ikadai, Mizuki Sasaki