Fulica americana, Gmelin, 1789

Caballero-Viñas, Carmen, Sánchez-Nava, Petra & Salgado-Maldonado, Guillermo, 2019, Redescription and new records of Polymorphus trochus (Van Cleave, 1945) (Polymorphida: Polymorphidae), in Mexico, Zootaxa 4668 (2), pp. 296-300 : 297

Host: Fulica americana ( Gruiformes : Rallidae )

Site of infection: Ileum

Locality: Laguna Chimaliapan (19º11’20’’N; 99º29’30’’W), State of Mexico, Mexico

Collection date: February 2016 – April 2017

Voucher: Helminthological Collection of the Instituto de Biologiìa, UNAM, Mexico City, Mexico (Cat. No. 10830).

Prevalence: 44.8/100(44.8%).

Mean intensity (range): 6.5 (1–25).

Adult males (based in 12 mature individuals with sperm): Trunk: 2.874 –5.283 (3.581) mm long by 0.821 –1.292 (1.095) mm wide. Neck: 155–244 (200) long by 319–423 (362) wide. Proboscis: 418–515 (450) long by 156–244 (216) wide. Length by width of hooks (from anterior to posterior): 28 x 7, 33 x 8, 37 x 10, 39 x 11, 40 x 12, 42 x 13, 41 x 13, 39 x 12, 35 x 10, 32 x 9, 28 x 8, 25 x 7; length by width of roots (from anterior to posterior): 8 x 3, 10 x 3, 14 x 5, 16 x 6, 18 x 6, 26 x 8, 25 x 8, 23 x 7, 16 x 5, 13 x 4, 10 x 3, 9 x 3. Proboscis receptacle: 812–1,164 (888) long by 214–292 (251) wide. Lemnisci: 859–1,421 (1034) long by 95–213 (137) wide. Reproductive system: 2.017 –3.666 (2.594) mm long, occupying 69%–80% (73%) of the trunk length. Anterior testis: 356–564 (405) long by 200–435 (298) wide; posterior testis: 285–612 (420) long by 200–423 (316) wide. Cement glands (4), 692-1, 571 (948) long by 54–101 (80) wide. Cement resevoir: 475–1162 (805) long by 115–220 (163). Everted bursa: 257–453 (303) long by 249–416 (333) wide.

Adult females (based on 11 gravid individuals, 2 of them with immature eggs and ovarian balls, the other 9 with mature eggs): Trunk: 2.473 –6.753 (5.097) mm long by 0.791 –1.458 (1.190) mm wide. Neck: 260–686 (524) long by 306–722 (541) wide. Proboscis: 493–592 (545) long by 192–439 (343) wide. Length by width of hooks (from anterior to posterior): 26 x 6, 32 x 8, 36 x 10, 38 x 12, 40 x 14, 40 x 15, 39 x 14, 41 x 13, 40 x 12, 37 x 12, 36 x 12, 30 x 11; length by width of roots (from anterior to posterior): 8 x 5, 11 x 4, 15 x 5, 22 x 7, 24 x 7, 30 x 8, 25 x 6, 21 x 5, 18 x 4, 17 x 4, 16 x 4, 13 x 2. Proboscis receptacle: 715–1,496 (1,139) long by 140–333 (242) mm wide. Lemnisci: 1,263 –2,521 (1,703) long by 59–147 (92.5) wide. Reproductive System: 0.536 –1.785 (1.217) mm long, occupying 22%–30% (26%) of the trunk length. Uterine bell: 163–281 (222) long by 79–176 (128) wide; uterus 257–451 (329) long. Vagina: 138–547 (322) long. Eggs: 54–82 (70) long by 12–17(15) wide.