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The caryophyllidean genus  Archigetes  Leuckart, 1878 is unique among all tapeworms in that its species can mature in invertebrate hosts (Oligochaeta), i.e., have a monoxenic (direct) life cycle. All five species were described as progenetic plerocercoids in oligochaetes and two of them also as adults from cypriniform fishes. Two species,  A. sieboldi  Leuckart, 1878 and  A. iowensis  Calentine, 1962, were found in North America in non-native common carp ( Cyprinus carpio ). A molecular study of caryophyllideans from the southern United States has revealed the occurrence of three new species in native freshwater fishes (Catostomidae, Ictiobinae):  Archigetes loculotruncatus  n. sp. from  Ictiobus bubalus ,  I. niger  and  Carpiodes cyprinus  is the largest representative of the genus and differs by a loculotruncate scolex.  Archigetes megacephalus  n. sp. from  Ictiobus niger ,  I. bubalus  and  I. cyprinellus  is characterised by a prominent, bothrioloculodiscate scolex.  Archigetes vadosus  n. sp. from  I. bubalus  is typified by a globular scolex with very shallow loculi; it differs from the closely related  A. sieboldi  in the shape of the body, with a distinct neck region and a scolex wider than the remaining body.  Archigetes iowensis  Calentine, 1962 becomes a junior synonym of  Paraglaridacris limnodrili  (Yamaguti, 1934). The generic diagnosis of  Archigetes  is amended and a key to identification of North American taxa is provided. Species of  Archigetes  and  Paraglaridacris  differ from each other most conspicuously in the structure of the ovary, which is follicular in  Archigetes  versus compact in  Paraglaridacris .

Archigetes Leuckart, 1878 (Cestoda, Caryophyllidea): diversity of enigmatic fish tapeworms with monoxenic life cycles