The thorny-headed worm family Polymorphidae contains endoparasites which as adults feed mainly in fish and aquatic birds. When this taxon was erected by Meyer in 1931, a subfamily Polymorphidae was established in it. As the Polymorphidae as presently understood would then be monotypic, with no basal genera outside the Polymorphinae, the proposed subfamily is redundant for the time being and therefore most modern treatments simply omit it.
Polymorphus minutus is an economically significant parasite in goose and duck farming.
Andracantha
Contains the following species:
Andracantha gravida (Alegret, 1941)
Andracantha mergi (Lundstroem, 1941)
Andracantha phalacrocoracis (Yamaguti, 1939)
Contains the following species:
Arhythmorhynchus brevis Van Cleave, 1916
Arhythmorhynchus capellae (Yamaguti, 1935)
Arhythmorhynchus comptus Van Cleave and Rausch, 1950
Arhythmorhynchus distinctus Baer, 1956
Arhythmorhynchus eroliae (Yamaguti, 1939)
Arhythmorhynchus frassoni (Molin, 1858)
Arhythmorhynchus frontospinosus (Tubangui, 1935)
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 siluricola Dollfus, 1929
Arhythmorhynchus teres Van Cleave, 1920
Arhythmorhynchus tigrinus Moghe and Das, 1953
Arhythmorhynchus trichocephalus (Leuckart, 1876)
Arhythmorhynchus tringi Gubanov, 1952
Arhythmorhynchus uncinatus (Kaiser, 1893)
Arhythmorhynchus xeni Atrashkevich, 1978
Contains the following species:
Bolbosoma balaenae (Gmelin, 1790)
Bolbosoma bobrovoi Krotov and Delamure, 1952
Bolbosoma brevicolle (Malm, 1867)
Bolbosoma caenoforme (Heitz, 1920)
Bolbosoma capitatum (Linstow, 1880)
Bolbosoma hamiltoni Baylis, 1929
Bolbosoma heteracanthis (Heitz, 1917)
Bolbosoma nipponicum Yamaguti, 1939
Bolbosoma physeteris Gubanov, 1952
Bolbosoma scomberomori Wang, 1980
Bolbosoma thunni Harada, 1935
Bolbosoma tuberculata Skrjabin, 1970
Bolbosoma turbinella (Diesing, 1851)
Bolbosoma vasculosum (Rudolphi, 1819)
Contains the following species:
Corynosoma alaskensis Golvan, 1958
Corynosoma anatarium Van Cleave, 1945
Corynosoma australe Johnston, 1937
Corynosoma bullosum (Linstow, 1892)
Corynosoma cameroni Van Cleave, 1953
Corynosoma capsicum Golvan and Mokhayer, 1973
Corynosoma clavatum Goss, 1941
Corynosoma clementi Giovannoni and Fernandes, 1965
Corynosoma constrictum Van Cleave, 1918
Corynosoma curiliensis Gubanov, 1942
Corynosoma enhydri Morozov, 1940
Corynosoma enrietti Molfie and Fretas, 1953
Corynosoma falcatum Van Cleave, 1953
Corynosoma hadweni Van Cleave, 1953
Corynosoma hamanni (Linstow, 1892)
Corynosoma kurilensis Gubanov, 1952
Corynosoma longilemniscatus Machado, 1961
Corynosoma macrosomum Neiland, 1962
Corynosoma magdaleni Montreuil, 1958
Corynosoma mandarinca Oschmarin, 1963
Corynosoma mirabilis Skrjabin, 1966
Corynosoma obtuscens Lincicome, 1943
Corynosoma otariae Morini and Boero, 1961
Corynosoma pacifica Nikolskii, 1974
Corynosoma peposacae (Porta, 1914)
Corynosoma pyriforme (Bremser, 1824)
Corynosoma rauschi Golvan, 1958
Corynosoma reductum (Linstow, 1905)
Corynosoma semerme (Forssell, 1904)
Corynosoma septentrionalis Treshchev, 1966
Corynosoma seropedicus Machado, 1970
Corynosoma shackletoni Zdzitowiecki, 1978
Corynosoma similis Neiland, 1962
Corynosoma singularis Skrjabin and Nilolskii, 1971
Corynosoma strumosum (Rudolphi, 1802)
Corynosoma sudsuche Belopolskaia, 1958
Corynosoma tunitae Weiss, 1914
Corynosoma turbidum Van Cleave, 1937
Corynosoma validum Van Cleave, 1953
Corynosoma ventronudum Skrjabin, 1959
Corynosoma villosum Van Cleave, 1953
Corynosoma wegeneri Heinze, 1934
Contains the following species:
Diplospinifer serpenticola Fukui, 1929
Contains the following species:
Filicollis anatis (Schrank, 1788)
Filicollis trophimenkoi Atrashkevich, 1982
Hexaglandula
Contains the following species:
Hexaglandula ariusus Bilgees, 1971
Hexaglandula corynosoma (Travassos, 1915)
Hexaglandula inermis (Travassos, 1923)
Hexaglandula karachiensis Bilgees, 1971
Hexaglandula mutabilis (Rudolphi, 1819)
Hexaglandula paucihamatus (Heinze, 1936)
Contains the following species:
Polymorphus actuganensis Petrochenko, 1949
Polymorphus acutis Van Cleave and Starrett, 1940
Polymorphus biziurae Johnston and Edmonds, 1948
Polymorphus cetaceum (Johnston and Best, 1942)
Polymorphus cincli Belopolskaya, 1959
Polymorphus contortus (Bremser, 1821)
Polymorphus corynoides Skrjabin, 1913
Polymorphus crassus Van Cleave, 1924
Polymorphus cucullatus Van Cleave and Starrett, 1940
Polymorphus diploinflatus Lundström, 1942
Polymorphus gavii Hokhlova, 1965
Polymorphus kostylewi Petrochenko, 1949
Polymorphus magnus Skrjabin, 1913
Polymorphus marchii (Porta, 1910)
Polymorphus marilis Van Cleave, 1939
Polymorphus mathevossianae Petrochenko, 1949
Polymorphus meyeri Lundström, 1942
Polymorphus miniatus (Linstow, 1896)
Polymorphus obtusus Van Cleave, 1918
Polymorphus paradoxus Connell and Corner, 1957
Polymorphus phippsi Kostylev, 1922
Polymorphus striatus (Goeze, 1782)
Polymorphus strumosoides Lundström, 1942
Polymorphus swartzi Schmidt, 1965
Polymorphus trochus Van Cleave, 1945
Contains the following species:
Profilicollis altmani (Perry, 1942)
Profilicollis arcticus (Van Cleave, 1920)
Profilicollis antarcticus (Zdzitowiecki, 1985)
Profilicollis botulus (Van Cleave, 1916)
Profilicollis bullocki (Mateo, 1982)
Profilicollis chasmagnathi (Holcman-Spector, Mane-Garzon and Dei-Cas, 1977)
Profilicollis formosus (Schmidt and Kuntz, 1967)
Profilicollis kenti (Van Cleave, 1947)
Profilicollis major (Lundström, 1942)
Profilicollis minutus (Goeze, 1782)
Profilicollis novaezelandensis (Brockerhoff, 2002)
Profilicollis sphaerocephalus (Bremser, 1819)
Profilicollis texensis (Webster, 1948)
Contains the following species:
Southwellina dimorpha Schmidt, 1973 (= Ibirhynchus dimorpha)
Southwellina hispida (Van Cleave, 1925)
Southwellina macracanthus (Ward and Winter, 1952)
