title: Haemonchus placei and Haemonchus contortus are distinct species based on mtDNA evidence.
abstract: Debates continue over the extent to which the parasitic trichostrongylids Haemonchus placei and Haemonchus contortus hybridise in nature, and whether they deserve species status. Mitochondrial ND4 gene sequences from individuals of each putative species collected from populations around the United States indicate that the two species are highly differentiated at the mtDNA level. Furthermore, there was no evidence of introgressive hybridisation occurring in wild populations.
authors.affiliation: Department of Zoology, Oregon State University, Corvallis 97331-2914, USA. blouinm@bcc.orst.edu
authors.forename: M S
authors.initials: MS
authors.lastname: Blouin
authors.forename: C A
authors.initials: CA
authors.lastname: Yowell
authors.forename: C H
authors.initials: CH
authors.lastname: Courtney
authors.forename: J B
authors.initials: JB
authors.lastname: Dame
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018509:DNA, Helminth / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics*; D006189:Haemonchus / Q000145:classification* / Q000235:genetics; D008969:Molecular Sequence Data; D009245:NADH Dehydrogenase / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
chemical_list: D018509:DNA, Helminth; D004272:DNA, Mitochondrial; C098483:NADH dehydrogenase subunit 4; D009245:NADH Dehydrogenase