Halicephalobus gingivalis (Stefanski, 1954) from a fatal infection in a horse in Ontario, Canada with comments on the validity of H. deletrix and a review of the genusR.C. Anderson, K.E. Linder and A.S. PeregrineParasite, 5 3 (1998) 255-261DOI: https://doi.org/10.1051/parasite/1998053255