Brachylecithum rileyi (Macy)

Infection site: Liver, gallbladder and intestine

Localities: Calcehtok and Homún

Prevalence (%) and median intensity: Calcehtok 42.1 and 6.2 (4.9–8.1). Homún 14.1 and 9.5 (4.5‒18.2)

Specimens deposited: CNHE-12306 and NHM 2025.8.13.1

GenBank accession numbers: PX232558‒PX232560 (28S)

Comments: Based on 10 specimens. Elongated body, 2271 ± 577 (1400–3100) × 345 ± 93 (220–500). Oral sucker subterminal, 145 ± 23 (110–179) × 116 ± 19 (82–160). Ventral sucker 164 ± 14 (145–180) × 146 ± 22 (120–185) (Figures 2A, 3A). Oval pharynx 37.3 ± 7 (30–50) × 42 ± 7 (28–50). Testes oblique; anterior testis 200 ± 45 (130–260) × 126 ± 34 (50–160), posterior testis 203 ± 71 (70–294) × 125 ± 36 (72–165). Ovary globular, posterior to the posterior testis, 95 ± 20 (60–120) × 120 ± 23 (88–155). Cirrus-sac and genital pore anterior to the oral sucker, 136 ± 25 (108–170) × 75 ± 11 (60–85). Vitellarium follicular, post-ovarian. Eggs 31 ± 0.9 (30–32) × 20 ± 0.8 (18–21).

The characteristics of the studied trematodes fit the recent redescription of B. rileyi collected from N. laticaudatus in Homún, Yucatán (Moguel-Chin et al. 2024). Other host recorded for this trematode in Mexico include Tadarida brasiliensis (Geoffroy Saint-Hilaire) in Durango, Morelos, Nuevo León, Puebla, Zacatecas (Guzmán-Cornejo et al. 2003; Caspeta-Mandujano et al. 2017; Martínez-Salazar et al. 2020).