01211naa a2200193 a 450000100080000000500110000800800410001910000150006024500880007526000090016352006950017265000130086765000250088065000140090565300130091965300130093270000200094577300520096517845891995-06-20       1960    bl ---       0--  u    #d1 aDAS, K. M.  aSubspeciation in Haemonchus contortus (Rudolphi, 1803) nemata, Trichostrongyloidea.  c1960  aIn view of the existence of much confusing literature on the taxonomy of Haemonchus contortus and the increasing evidence of bionomic and immunologic differences between geographic strains, it was decided to undertake some comparative morphological studies of Haemonchus parasites from different geographic regions. In the course of this investigation certain consistent morphoological differences were found to be present in geographic populations of H. contortus; these are belibed to be substantial evidence of subspeciation. The purpose of this paper is to describe these different geographic populations as subspecies under the species Haemonchus contortus (Rudolphi, 1803), Cobb 1898.  ataxonomy  aHaemonchus Contortus  aTaxonomia  aParasita  aParasite1 aWHITLOCK, J. H.  tCornell Veterinarygv.50, n.2, p.182-197, 1960.