A phylogenetic tree was constructed based on partial sequences of 5 nad4 genes for Haemonchus contortus. The tree was generated without nucleotide gaps using a Maximum Likelihood analysis with 1000 replicates based on the Tamura 3-parameter model. Only bootstrap values greater than 50% from 1000 replicates are displayed at the nodes. Positions containing gaps and missing data were removed, and other settings were set to default values in MEGA 7.0. H. placi (accession no. AF070820) was used as an outgroup. Black-filled circles represent the sequences generated in this study.