Description and molecular characterisation of Cloacina johnstoni sp. nov. (Nematoda: Strongyloidea) from the wallaroo, Macropus robustus (Marsupialia: Macropodidae) and relationships with the synhospitalic species C. macropodis.

Cloacina johnstoni sp. nov. (Nematoda: Strongyloidea) is described from the sacculated forestomach of the wallaroo, Macropus robustus (Marsupialia: Macropodidae) from Australia. It resembles the synhospitalic species Cloacina macropodis but differs from it principally in the shape of the cephalic papillae. The two species are also distinguishable based on differences in the first and second internal transcribed spacers (ITS) of nuclear ribosomal DNA (rDNA). Cloacina johnstoni commonly co-occurs in the same individual host as C. macropodis but has a more restricted geographical distribution.