Aponurus vitellograndis Layman, 1930 accepted as Hysterolecitha vitellograndis (Layman, 1930) Skrjabin & Guschanskaja, 1954 (original description)
Aporocotyle odhneri Layman, 1930 accepted as Paradeontacylix odhneri (Layman, 1930) McIntosh, 1934 (original description)
Brachyphallus anurus Layman, 1930 accepted as Genolinea anura (Layman, 1930) Manter, 1954 (original description)
Bucephalopsis basargini Layman, 1930 accepted as Bucephaloides basargini (Layman, 1930) accepted as Prosorhynchoides basargini (Layman, 1930) Margolis & Arthur, 1979 (original description)
Bucephalopsis pleuronectis Layman, 1930 accepted as Prosorhynchoides pleuronectis (Layman, 1930) (original description)
Cainocreadium skrjabini Layman, 1930 accepted as Lepidauchen skrjabini (Layman, 1930) Yamaguti, 1954 (original description)
Crepidostomum ussuriense Layman, 1930 accepted as Crepidostomum farionis (Müller, 1780) Lühe, 1909 (original description)
Derogenes kobayashii Layman, 1930 accepted as Gonocerca kobayashii (Layman, 1930) Manter, 1934 (original description)
Didymozoon scombri Taschenberg, 1879 accepted as Nematobothrium scombri (Taschenberg, 1879) Ishii, 1935 (redescription)
Diploporus hemistoma Ozaki, 1928 accepted as Bianium hemistoma (Ozaki, 1928) Yamaguti, 1934 (redescription)
Helicometrina azumae Layman, 1930 accepted as Decemtestis azumae (Layman, 1930) Yamaguti, 1934 (original description)
Hysterolecitha blepsiae Layman, 1930 (original description)
Lebouria isaitschikowi Layman, 1930 accepted as Plagioporus isaitschikowi (Layman, 1930) Price, 1934 accepted as Macvicaria isaitschikowi (Layman, 1930) Bray, 1985 (original description)
Lecithaster gibbosus (Rudolphi, 1802) Lühe, 1901 (redescription)
Lecithaster lindbergi Layman, 1930 accepted as Lecithurus lindbergi (Layman, 1930) Pigulewsky, 1938 accepted as Tubulovesicula lindbergi (Layman, 1930) Yamaguti, 1934 (original description)
Maculifer japonicus Layman, 1931 (original description)
Monorcheides petrowi Layman, 1930 accepted as Bacciger petrowi (Layman, 1930) Zhukov, 1960 accepted as Pentagramma petrowi (Layman, 1930) Margolis & Ching, 1965 accepted as Pseudopentagramma petrowi (Layman, 1930) Yamaguti, 1971 accepted as Pronoprymna petrowi (Layman, 1930) Bray & Gibson, 1980 (original description)
Opecoelus sphaericus Ozaki, 1925 (redescription)
Opegaster ozaki Layman, 1930 accepted as Opecoelus ozaki (Layman, 1930) Yamaguti, 1954 (original description)
Pharyngora orientalis Layman, 1930 accepted as Prodistomum orientale (Layman, 1930) Bray & Gibson, 1990 (original description)
Phyllodistomum marinum Layman, 1930 (original description)
Plectognathotrema Layman, 1930 (original description)
Plectognathotrema cephalopore Layman, 1930 (original description)
Pseudocreadium Layman, 1930 (original description)
Pseudocreadium monacanthi Layman, 1930 (original description)
Rhodotrema quinquelobata Layman, 1930 accepted as Steringotrema quinquelobatum (Layman, 1930) Yamaguti, 1954 accepted as Stenakron quinquelobatum (Layman, 1930) Mamaev, Parukhin & Baeva, 1963 accepted as Stenakron vetustum Stafford, 1904 (original description)
Steringotrema pulchrum Johnston, 1913 of Layman (1930) accepted as Lintonium laymani Skrjabin & Koval, 1957 (original description)