title: The systematic position of Leptorhynchoides (Kostylew, 1924) and Pseudoleptorhynchoides (Salgado-Maldonado, 1976), inferred from nuclear and mitochondrial DNA gene sequences.
abstract: The systematic relationships of acanthocephalans, including Leptorhynchoides and Pseudoleptorhynchoides that occur in freshwater and marine fishes in Neartic and Neotropical regions, are enigmatic. Leptorhynchoides (3 species) and Pseudoleptorhynchoides (1 species) are presently classified in the Rhadinorhynchidae. However, recent molecular and morphological phylogenies have challenged the monophyly of this family. Sequences of nuclear ribosomal DNA (large subunit, small subunit regions) and the mitochondrial cytochrome c oxidase subunit I gene of Leptorhynchoides thecatus and Pseudoleptorhynchoides lamothei were used in phylogenetic analyses with available sequences of 26 other acanthocephalans. Maximum parsimony and maximum likelihood analyses were identical in placing both genera in the Illiosentidae. Bootstrap analyses also indicate that placement of these genera with members of Illiosentidae is reliably supported.
authors.affiliation: Departamento de Zoología, Instituto de Biología, Universidad Nacional Autónoma de México, Distrito Federal, México City, D.F., Mexico. garciav@servidor.unam.mx
authors.forename: Martín
authors.initials: M
authors.lastname: García-Varela
authors.forename: Angélica
authors.initials: A
authors.lastname: González-Oliver
mesh_terms: D000049:Acanthocephala / Q000145:classification* / Q000235:genetics; D000818:Animals; D001483:Base Sequence; D002397:Catfishes / Q000469:parasitology; D004272:DNA, Mitochondrial / Q000737:chemistry*; D004275:DNA, Ribosomal / Q000737:chemistry*; D003576:Electron Transport Complex IV / Q000235:genetics; D005393:Fish Diseases / Q000469:parasitology; D006374:Helminthiasis, Animal / Q000469:parasitology; D008969:Molecular Sequence Data; D010802:Phylogeny; D015138:RNA, Nuclear / Q000235:genetics; D012342:RNA, Small Nuclear / Q000235:genetics; D016415:Sequence Alignment / Q000662:veterinary
chemical_list: D004272:DNA, Mitochondrial; D004275:DNA, Ribosomal; D015138:RNA, Nuclear; D012342:RNA, Small Nuclear; D003576:Electron Transport Complex IV