title: Review of Papillostrongylus Johnston & Mawson, 1939 (Nematoda: Strongyloidea) from wallabies and kangaroos (Marsupialia: Macropodidae) using morphological and molecular techniques, with the description of P. barbatus n. sp.
abstract: The strongyloid nematode genus Papillostrongylus Johnston & Mawson, 1939, from kangaroos and wallabies, is reviewed using morphological and molecular methods. P. labiatus Johnston & Mawson, 1939 is re-described from material from the type-host, the black-striped wallaby Macropus dorsalis, from eastern Queensland, Australia, in which it is a relatively common parasite. Additional records from M. parryi and Thylogale thetis are confirmed and considered to represent examples of host-switching. A geographically disjunct population of the nematode species occurs in M. bernardus and Petrogale brachyotis in Arnhem Land, Northern Territory, but assessment of its status requires additional material. Nematodes from M. rufus, M. giganteus, M. fuliginosus and M. robustus from inland regions of Australia, formerly attributed to P. labiatus, are here assigned to a new species, P. barbatus, distinguished by the presence of an external leaf-crown, larger size, by greater spicule length in the male and by a sinuous vagina in the female. Additional hosts of P. barbatus n. sp. are Petrogale assimilis and Pet. lateralis purpureicollis. Sequence analyses of the second internal transcribed spacer of ribosomal DNA (ITS-2) also showed that P. barbatus n. sp. differed at 40 (16.7%) of the 240 alignment positions when compared with P. labiatus. Most of these interspecific sequence differences occurred in loops or bulges of the predicted precursor rRNA secondary structure, or represented partial or total compenstory base pair changes in stems.
authors.affiliation: Department of Veterinary Science, University of Melbourne, Parkville, Victoria, 3052, Australia.
authors.forename: N B
authors.initials: NB
authors.lastname: Chilton
authors.forename: F
authors.initials: F
authors.lastname: Huby-Chilton
authors.forename: R B
authors.initials: RB
authors.lastname: Gasser
authors.forename: I
authors.initials: I
authors.lastname: Beveridge
mesh_terms: D000818:Animals; D001315:Australia; D001483:Base Sequence; D003001:Cloning, Molecular; D018509:DNA, Helminth / Q000235:genetics*; D021903:DNA, Ribosomal Spacer; D005260:Female; D007614:Macropodidae / Q000469:parasitology*; D008297:Male; D008855:Microscopy, Electron, Scanning; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity; D013320:Strongyloidea / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics / Q000648:ultrastructure
chemical_list: D018509:DNA, Helminth; D021903:DNA, Ribosomal Spacer