Ochoterenatrema sp.

Ochoterenatrema sp.

Infection site: Intestine

Localities: Calcehtok and Homún

Prevalence (%) and median intensity: Calcehtok 25.4 and 12.7 (7.7‒22.6). Homún 3.9 and 2.4 (1‒4.4)

Specimens deposited: CNHE-12309 and NHM 2025.8.13.3

GenBank accession numbers: PX232563‒PX232565 (28S)

Comments: Based on nine trematodes. Pear-shaped body, 348 ± 72 (260–470) × 223 ± 78 (150–400) ( Figure 2E View FIGURE 2 ). Oral sucker subterminal, 72 ± 13 (55–85) × 76 ± 9 (70–90). Ventral sucker 62 ± 20 (32–89) × 59 ± 18 (48–98). Pharynx 30 ± 4 (26–35) × 28 ± 5 (20-32). Right testis 57 ± 10 (45–68) × 54 ± 10 (40–65). Left testis 53 ± 15 (42–80) × 61 ± 15 (38–78). Ovary at level of ventral sucker, overlapping to the right testis, 60 ± 7 (55–65) × 77 ± 3 (75–79). Vitellarium extending from the oral sucker to the anterior level of testes. Pseudocirrus sac at level of the ventral sucker, 62.8 ±15 (48–80) × 72 ± 20 (50–94). Eggs 20 ± 1 (18–21) × 10 ± 0.8 (8–10).

The newly collected specimens have morphological characteristics of the genus Ochoterenatrema , namely the presence of pseudogonotyl situated to the left of the ventral sucker, entire testes and median pseudocirrus sac ( Fernandes et al. 2022). The material from Yucatán closely resembles Ochoterenatrema piriforme Tkach, Gasperetti, Fernandes, Carrio ́n-Bonilla, Cook & Achatz for characteristics such as the position of the ovary and the vitellarium. However, the studied specimens have smaller structures than O. piriforme , such as ventral sucker and pseudocirrus sac (62 × 59 and 63 × 72 vs. 72 × 78 and 79 × 82, respectively) than O. piriforme ( Tkach et al. 2024) ; thus, the specimens may represent a species not described yet. In Mexico, Ochoterenatrema labda Caballero has been reported from Balantiopteryx plicata (Peters) , T. brasiliensis , Pteronotus fulvus (Thomas) , Mormoops megalophylla (Peters) , Myotis velifer (Allen) , and Natalus mexicanus Miller in Morelos, Mexico City, Mexico State, Durango, Nuevo León, Puebla, Veracruz, and Zacatecas ( Caspeta-Mandujano et al. 2017). In N. laticaudatus , an unidentified species of Ochoterenatrema has been reported in Oaxaca ( Martínez-Pérez 2021). This is the first record of Ochoterenatrema for Yucatán.