Helminths of small rodents (Heteromyidae and Cricetidae) in the Yucatan Peninsula, Mexico: an integrative taxonomic approach to their inventory Author Panti-May, Jesús Alonso Centro de Investigaciones Regionales “ Dr. Hideyo Noguchi ”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México. Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Mérida, Yucatán, México. Author Moguel-Chin, Wilson Isaias 0000-0002-2564-4086 wilson-im @ hotmail. com; https: // orcid. org / 0000 - 0002 - 2564 - 4086 wilson-im@hotmail.com Author Hernández-Mena, David Iván 0000-0003-0822-3498 Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mérida, Yucatán, México & dahernandez. 243 @ gmail. com; https: // orcid. org / 0000 - 0003 - 0822 - 3498 dahernandez.243@gmail.com Author Cárdenas-Vargas, Miguel Humberto 0009-0003-3622-6351 miguel. carvar 23 @ gmail. com; https: // orcid. org / 0009 - 0003 - 3622 - 6351 miguel.carvar23@gmail.com Author Torres-Castro, Marco 0000-0002-8295-0100 Centro de Investigaciones Regionales “ Dr. Hideyo Noguchi ”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México. Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Mérida, Yucatán, México. & antonio. torres @ correo. uady. mx; https: // orcid. org / 0000 - 0002 - 8295 - 0100 antonio.torres@correo.uady.mx Author García-Prieto, Luis 0000-0002-7529-1514 Instituto de Biología, Universidad Nacional Autónoma de México, Ciudad de México, México. & luis. garcia @ ib. unam. mx; https: // orcid. org / 0000 - 0002 - 7529 - 1514 luis.garcia@ib.unam.mx Author Digiani, Maria Celina 0000-0002-1626-9309 CONICET. División Zoología Invertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Argentina & mdigiani @ fcnym. unlp. edu. ar; https: // orcid. org / 0000 - 0002 - 1626 - 9309 mdigiani@fcnym.unlp.edu.ar Author Hernández-Betancourt, Silvia F. 0000-0001-7302-9582 hbetanc @ correo. uady. mx; https: // orcid. org / 0000 - 0001 - 7302 - 9582 hbetanc@correo.uady.mx Author Vidal-Martínez, Víctor Manuel 0000-0002-6829-6317 Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mérida, Yucatán, México & vvidal @ cinvestav. mx; https: // orcid. org / 0000 - 0002 - 6829 - 6317 vvidal@cinvestav.mx text Zootaxa 2023 2023-10-18 5357 2 205 240 http://dx.doi.org/10.11646/zootaxa.5357.2.3 journal article 10.11646/zootaxa.5357.2.3 1175-5326 10017978 A8932459-5A17-4812-8557-B9613DE69CEB Syphacia peromysci Harkema Site of infection: Caecum and large intestine Host species: Peromyscus yucatanicus Localities: Aak ecological park and Kuncheil cattle ranch ( Yucatan ) Specimens deposited: CNHE 12024, 12025 Comments: The specimens examined from Yucatan had characteristics described by Kruidenier et al . (1961) , Quentin & Kinsella (1972) and Panti-May et al . (2018) , i.e., cephalic plate rounded (males) or laterally-elongated (females) ( Figure 5A ); cervical alae present in both males and females ( Figure 5B ); deirids in females, not observed in males; males with three mamelons ( Figure 5C ), spicule 57 long, gubernaculum 27 long, accessory hook with ornamentation, three pairs of caudal papillae surrounding the cloacal region, and tail 60 long ( Figure 5D ); some females with slightly prominent vulva; eggs 93.5–95.9 long by 27.1 wide ( Figure 5E ), and tail 441–509.6 long. In Mexico , Sy . peromysci has been recorded from Peromyscus sp. , Peromyscus boylii (Baird) , Peromyscus maniculatus (Wagner) , Peromyscus melanotis Allen & Chapman in Chihuahua ( Preisser & Falcón-Ordaz 2019 ), P . maniculatus in Hidalgo ( Pulido-Flores et al. 2005 ), P . difficilis in Veracruz ( Falcón-Ordaz et al. 2016 ), and P . yucatanicus in Yucatan ( Panti-May et al. 2018 ). Our study adds two new locality records in Yucatan .