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. Systematic Parasitology, 51(2), February 2002: 81-93. 85 [Zoological Record Volume 138]