Euparadistomum sp.

Moguel-Chin, Wilson Isaias, Suárez-Galaz, Alejandro, Casanova, Anyela Jackelin Chan-, Concha-Guillermo, Henry Orlando, Tzec-Che, Ruben Guadalupe, Robles, María Del Rosario, Digiani, María Celina, Hernández-Orts, Jesús S., Ruiz Torres, Nallely G., Macswiney, M. Cristina & Panti-May, Jesús Alonso, 2025, Helminths of the broad-tailed bat Nyctinomops laticaudatus (Geoffroy Saint-Hilaire) in Mexico, and description of a new species of nematode (Molineidae: Anoplostrongylinae), Zootaxa 5696 (4), pp. 517-541 : 521-522

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 ). 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.

Figures

FIGURE 2. Trematodes of N. laticaudatus. A. Specimen of B. rileyi, ventral view. B. Dissected specimen of Euparadistomum sp., ventral view. C. Specimen of L. nanum, ventral view. D. Specimen of Phaneropsolidae gen. sp., ventral view. E. Specimen of Ochoterenatrema sp., ventral view. F. Specimen of U. minuta, ventral view. G. Specimen of Urotrema sp., ventral view.