“…Their taxonomic, ecological, and behavioural diversities have received much attention (e.g., Fitzpatrick, 1985;Lanyon, 1984;Smith, 1971;Vuilleumier, 1971). Systematic research has traditionally focussed on higher-level relationships within the assemblage and has been based on internal and external anatomy (e.g., Lanyon, 1984Lanyon, , 1985Lanyon, , 1986Traylor, 1977) with contributions from DNA hybridization (McKitrick, 1985;Sibley and Ahlquist, 1985). More recently, DNA sequencing has made it feasible to examine relationships among species in some of the larger, morphologically homogeneous genera (Chesser, 2000;Roy et al, 1999).…”