Hassalstrongylus musculi (Dikmans)

(= Longistriata musculi Dikmans)

Site of infection: Small intestine

Host species: Ototylomys phyllotis and Oligolyzomys fulvescens

Localities: Ich ha lol xaan ecological park (Campeche)

Specimens deposited: CNHE 12014, 12015

GenBank accession numbers: OR271667, OR271668

Comments: The characteristics observed in our material agreed with those described by Dikmans (1935), the re-description by Durette-Desset (1974) and by Panti-May et al. (2018) of parasites from M. musculus, i.e., 24 cuticular ridges in the synlophe at midbody (Figure 4H); slightly dissymmetrical bursa with right lobe larger than left, with pattern of type 1-3-1; rays 8 stout and longer than the dorsal ray; dorsal ray divided in its second third (Figure 4I); spicules 400–430 long with typical foot shaped tips; and gubernaculum absent.

In Mexico, Ha. musculi has been recorded from Ol. fulvescens, Or. couesi, and Handleyomys melanotis Thomas in San Luis Potosí (Underwood et al. 1986) and M. musculus in Yucatan (Panti-May et al. 2018, 2021). Hassalstrongylus musculi is reported for the first time in Campeche and for O. phyllotis .