(= Heligmosomum braziliense Travassos; = Heligmosomum muris Yokogawa)
Site of infection: Small intestine
Host: Rattus rattus
Locality: Paraíso
Prevalence and mean intensity (range): 14.3% (1/7) and 37 (37)
Specimens deposited: MLP-He 7433 and CNHE 10712
Comments: The specimens collected in this study exhibited characteristics described by Yokogawa (1920) and Haley (1961), i.e. 14 cuticular ridges in the synlophe at midbody; asymmetrical bursa with right lobe longer than left, with pattern of type 1-4; in right lobe, ray 2 long and slender, rays 3 and 6 short and slender, rays 4 and 5 thick contiguous and diverging in distal portion; in left lobe, rays 2 to 5 long and slender, ray 6 thick and curved towards dorsal lobe; both rays 8 short and slender; short dorsal ray; rays 9 arising at same level of division of the dorsal ray; and spicules 565–618 long.
In México, N. brasiliensis has been recorded from M. musculus in Tabasco (Cigarroa-Toledo et al. 2017), R. rattus in Hidalgo (Pulido-Flores et al. 2005) and Tabasco (Cigarroa-Toledo et al. 2017), and R. norvegicus in Michoacán (Hierro-Huerta 1992) and Tabasco (Cigarroa-Toledo et al. 2017).
In Yucatán, this species has been previously reported from M. musculus and R. rattus in three localities in Mérida and Opichén (Panti-May et al. 2015, 2017).