title: Differences in the second internal transcribed spacer of four species of Nematodirus (Nematoda: Molineidae).
abstract: Genetic differences among Nematodirus spathiger, Nematodirus filicollis, Nematodirus helvetianus and Nematodirus battus in the nucleotide sequence of the second internal transcribed spacer (ITS-2) of ribosomal DNA ranged from 3.9 to 24.7%. Pairwise comparisons of their ITS-2 sequences indicated that the most genetically similar species were N. spathiger and N. helvetianus. N. battus was the most genetically distinct species, with differences ranging from 22.8 to 24.7% with respect to the other three species. Some of the nucleotide differences among species provided different endonuclease restriction sites that could be used in restriction fragment length polymorphism studies. The ITS-2 sequence data may prove useful in studies of the systematics of molineid nematodes.
authors.affiliation: Department of Veterinary Science, University of Melbourne, Werribee, Victoria, Australia.
authors.forename: L A
authors.initials: LA
authors.lastname: Newton
authors.forename: N B
authors.initials: NB
authors.lastname: Chilton
authors.forename: I
authors.initials: I
authors.lastname: Beveridge
authors.forename: R B
authors.initials: RB
authors.lastname: Gasser
mesh_terms: D000818:Animals; D001483:Base Sequence; D018509:DNA, Helminth / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics*; D008969:Molecular Sequence Data; D009348:Nematoda / Q000145:classification / Q000235:genetics*; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
chemical_list: D018509:DNA, Helminth; D004275:DNA, Ribosomal