A checklist of the helminth parasites of sympatric rodents from two Mayan villages in Yucatán, México Author Panti-May, Jesús Alonso Author Digiani, María Celina Author Palomo-Arjona, Eduardo Emir Author Gurubel-González, Yessica Margely Author Navone, Graciela T. Author Machain-Williams, Carlos Author Hernández-Betancourt, Silvia F. Author Robles, María Del Rosario text Zootaxa 2018 2018-04-05 4403 3 495 512 journal article 30326 10.11646/zootaxa.4403.3.4 9fa78a2b-54eb-4e26-8bc2-c14b2b7ae946 1175-5326 1212929 171E79AE-35AF-48B1-B1CA-7A2D2F3F488F Syphacia muris (Yamaguti) (= Enterobius muris Yamaguti ) Site of infection: Caecum and large intestine Host: Rattus rattus Locality: Xkalakdzonot Prevalence and mean intensity (range): 65.3% (77/118) and 77.9 (1–816) Specimens deposited: MLP-He 7435 and CNHE 10706 Comments: The traits presented in our specimens were in accordance with those described by Hugot & Quentin (1985), Robles et al . (2008), and Khalil et al . (2014), i.e. quadrangular cephalic plate; amphids located close to the ventral submedian papillae; slight swellings of the cuticle instate of lateral alae; males with three mamelons, spicule 50–56 long, gubernaculum 25–30 long, accessory hook without ornamentation, three pairs of caudal papillae surrounding the cloacal region, and tail 174–250 long; and females with no prominent vulva, tail 334–650 long, and eggs 73–80 long by 27–37 wide. In México , S. muris has been reported from R. rattus in Hidalgo (Pulido-Flores et al. 2005) and Tabasco ( Cigarroa-Toledo et al. 2017 ). In Yucatán , this species has been previously reported from R. rattus in three localities in Mérida and in Opichén (Panti-May et al. 2015, 2017).