Euparadistomum sp.

Euparadistomum sp.

Infection site: Gallbladder

Locality: Calcehtok

Prevalence (%) and median intensity: Calcehtok 1.6 and 1.5 (1‒2)

Specimen deposited: CNHE-12307

GenBank accession number: PX232561 (28S)

Comments: Based on two specimens. Oval body, 3350–3560 × 1850–2170 ( Figure 2B View FIGURE 2 ). Oral sucker 470–480 × 565–610. Ventral sucker 840 × 820. Oval pharynx 170 × 190–200. Testes small, in the anterior border to ventral sucker; right testis 230–270 × 190–240, left testis 240–280 × 260. Ovary postesticular, overlap on the posterior border to ventral sucker, 360–400 × 270–300. Uterus extending from pharynx to body end. Vitelline reservoir posterior to the ovary. Vitellarium in two bands extending laterally from testes level to the forebody. Eggs 44–45 × 25–26.

The morphological features fit with the description of Euparadistomum ( Bray et al. 2008) . This genus has been reported from a variety of host: reptiles, birds and mammals from New Guinea, Ivory Coast, Equatorial Guinea, Malaysia, Myanmar and Brazil ( Betterton 1980; El-Dakhly et al. 2018; Emmerich et al. 2025). In bats, Euparadistomum cerivoulae Gogate has been reported in Kerivoula picta (Pallas) from Myanmar; however, studied specimens have some differences with this species, like bigger testes ( vs. 163 ×134 and 167 × 145 in E. cerivoulae ) ( Gogate 1939). In the Americas, Euparadistomum cisalpinai Emmerich, Cenci de Aguiar & da Silva and Euparadistomum paraense (Jansen) have only been recorded from reptiles Tropidurus torquatusand (Wied- Neuwied) and Tropidurus hispidus (Spix) ( Emmerich et al. 2025) , respectively. However, these species differ from the specimens collected in Yucatán by having a higher oral sucker/ventral sucker ratio and by lacking cuticular papillae ( Emmerich et al. 2025). These differences suggest that these trematodes may represent a species not described yet. This is the first record of Euparadistomum in bats from Mexico.