Reconsideration of the species assigned to Faustula Poche, 1926 (Digenea: Microphalloidea) with the proposal of five new genera in the Faustulidae Poche, 1926 Author Dronen, Norman O. Laboratory of Parasitology, Biodiversity Research & Teaching Collection, Department of Ecology & Conservation Biology, College of Agriculture & Life Sciences, Texas A & M University, College Station, Texas 77843, U. S. A. & The Schubot Center for Avian Health, College of Veterinary Medicine & Biomedical Sciences, Texas A & M University, College Station, Texas 77843, U. S. A. Author Blend, Charles K. Corpus Christi Museum of Science & History, 1900 N. Chaparral St., Corpus Christi, Texas 78401, U. S. A. & Research Associate, Laboratory of Parasitology, Biodiversity Research & Teaching Collection, Department of Ecology & Conservation Biology, College of Agriculture & Life Sciences, Texas A & M University, College Station, Texas 77843, U. S. A. Author Mohammed, Essa T. Marine Science Center, University of Basrah, Iraq. Author Bannai, Majid Marine Science Center, University of Basrah, Iraq. text Zootaxa 2021 2021-08-31 5027 2 231 253 journal article 10.11646/zootaxa.5027.2.5 1175-5326 5448290 041275C5-9611-4218-8D72-2BF0AA584C5F Key to the genera of the Faustulidae modified from Bray (2008) 1a. Cirrus sac absent....................................................... Pseudobacciger Nahhas & Cable , 19641 1b. Cirrus sac present..................................................................................... 2 2a. Genital pore marginal or nearly so................................................... Yamagutia Srivastava, 1937 2b. Genital pore median to submedian........................................................................ 3 3a. Body conical, with lateral margins folded ventrally and truncate posterior margin............ Trigonocryptus Martin, 1958 3b. Body shaped otherwise, lacking folded lateral margins and truncated posterior margin............................... 4 4a. Body somewhat biconic with large terminal oral sucker, narrower isthmus-like forebody, broad ventral sucker region, and relatively long tapering posterior end................................................ Schellitrema n. gen. 2 ( Fig. 7 ) 4b. Body oval to elliptical (elongate-oval) with subterminal ovary, sometimes lingulate, usually with broadly tapering extremities ................................................................................................... 5 5a. Testes and/or ovary in forebody.......................................................................... 6 5b. Gonads in hindbody or somewhat overlapping ventral sucker.................................................. 7 6a. Testes mainly in hindbody; ovary in forebody; ceca long, reach close to posterior extremity Allofellodistomum Yamaguti, 1971 6b. Testes in forebody; ovary in posterior forebody, dorsal to ventral sucker or occasionally in anterior hindbody; ceca short, saccate, divergent.................................................................... Antorchis Linton, 1911 (Syns. Jonesiella Hafeezullah & Siddiqi, 1970 nec Brady, 1980; Mesorchis Linton, 1910 nec Dietz, 1909; Neoparantorchis Hafeezullah & Siddiqi, 1971 ; Parantorchis Yamaguti, 1934 ) 7a. Testes near posterior extremity; uterus largely pretesticular, may slightly overlap anterior aspect of testes................ 8 7b. Testes some distance from posterior extremity, usually near midlevel of body; uterus largely posttesticular.............. 10 8a. Ceca relatively long, terminating well posterior of midlevel of body; vitelline follicles relatively large, linear, centered around midlevel of body along lateral margins.......................................... Pseudofellodistomum Wang, 1989 8b. Ceca relatively short, not surpassing midlevel of body posteriorly; vitelline follicles relatively small, arranged in clusters, 1 on each side in forebody.................................................................................. 9 9a. Ventral sucker relatively large, located at midlevel of body; ovary immediately anterior to testes.................................................................................. Echinobreviceca Dronen, Blend & McEachran, 1994 9b. Ventral sucker relatively small, located near posterior extremity; ovary intertesticular....... Parayamagutia Machida, 1971 10a. Ovary pretesticular, may slightly overlap level of anterior aspect of testes........................................ 11 10b. Ovary intertesticular, or posttesticular, may partially extend anteriorly into posterior aspect of intertesticular space....... 13 11a. Ventral sucker distinctly larger than oral sucker; may be replaced by a non-acetabulate, pad-like structure with muscular ridges or lobes in some species.......................... Paradiscogaster Yamaguti, 1934 (Syns. Discogaster Yamaguti, 1934 nec Burmeister, 1835; Discogastroides Strand, 1934 ; Odontocotyle Hafeezullah & Siddiqi, 1971 ; Odontotrema Hafeezullah & Siddiqi, 1970 nec Lindholm, 1927; Pseudodiscogasteroides Gupta, 1953 ; Neobenthotrema Wang, 1991 ) 11b. Normal acetabulate ventral sucker present, not greatly larger than oral sucker, may be somewhat smaller............... 12 12a. Ovary distinctly trilobed; testes contiguous or nearly so................................. Gobifaustula n. gen. ( Fig. 6 ) 12b. Ovary entire; testes not overly close together........ Baccigeroides Dutta, 1995 (Syn. Baccigeroides Manna & Datta, 1996 ) 13a. Ovary entire, may be somewhat irregular, no distinct lobes present Bacciger Nicoll, 1914 (Syn. Ovotrema Pigulewsky, 1938 ) 3