Faustulidae, Poche, 1926

Dronen, Norman O., Blend, Charles K., Mohammed, Essa T. & Bannai, Majid, 2021, Reconsideration of the species assigned to Faustula Poche, 1926 (Digenea: Microphalloidea) with the proposal of five new genera in the Faustulidae Poche, 1926, Zootaxa 5027 (2), pp. 231-253 : 248

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

Figures

FIGURES 7–8. Diagrammatic illustrations of faustulids (ventral views): 7. Schellitrema gasterostei (Schell, 1973) n. comb. based on Schell (1973); representative of Schellitrema n. gen. 8. Gangifaustula makundai (Agarwal & Verma, 1981) n. comb. based on Agarwal & Verma (1981); representative of Gangafaustula n. gen.

FIGURES 5–6. Diagrammatic illustrations of faustulids (ventral views): 5. Faustula gangetica (Srivastava, 1935) Yamaguti, 1958 based on Srivastava (1935). 6. Gobiofaustula qikouensis (Qiu & Li, 1995) n. comb. based on Qiu & Li (1995); representative of Gobiofaustula n. gen.