Polymorphidae Meyer, 1931
Arhythmorhynchus brevis Van Cleave, 1916
Arhythmorhynchus capellae (Yamaguti, 1935)
Arhythmorhynchus comptus Van Cleave & Rausch, 1950
Arhythmorhynchus distinctus Baer, 1956
Arhythmorhynchus eroliae (Yamaguti, 1939)
Arhythmorhynchus frassoni (Molin, 1858)
Arhythmorhynchus frontospinosus (Tubangui, 1935)
Arhythmorhynchus hispidum Van Cleave, 1925
Arhythmorhynchus invaginablis (von Linstow, 1890)
Arhythmorhynchus jeffreyi Schmidt, 1973
Arhythmorhynchus johnstoni Golvan, 1960
Arhythmorhynchus limosae Edmonds, 1971
Arhythmorhynchus longicollis (Villot, 1875)
Arhythmorhynchus petrochenkoi (Schmidt, 1969)
Arhythmorhynchus plicatus (Linstow, 1883)
Arhythmorhynchus pumiliorostris Van Cleave, 1916
Arhythmorhynchus pumilirostris Van Cleave, 1916
Arhythmorhynchus roseum (Molin, 1858)
Arhythmorhynchus siluricola Dollfus, 1929
Arhythmorhynchus teres Van Cleave, 1920
Arhythmorhynchus tigrinus Moghe & Das, 1953
Arhythmorhynchus trichocephalus (Leuckart, 1876)
Arhythmorhynchus tringi Gubanov, 1952
Arhythmorhynchus uncinatus (Kaiser, 1893)
Arhythmorhynchus villoti Golvan, 1994
Arhythmorhynchus xeni Atrashkevich, 1978
