Despite decades of phylogenetic studies, the generic and species-level relationships of some Australian elapid snakes
remain problematic. The morphologically conservative genus Parasuta comprises small nocturnal snakes with a
particularly obfuscated taxonomic history. Here we provide a molecular phylogenetic analysis of all currently recognised
species including members of the sister genus Suta and provide new morphological data that lead to a taxonomic revision
of generic and species boundaries. We failed to find support for monophyly of Parasuta or Suta, instead supporting
previous evidence that these two genera should be combined. Our species-level investigations revise the boundaries
between P. gouldii (Gray) and P. spectabilis (Krefft) resulting in recognition that both P. spectabilis bushi (Storr) and P.
spectabilis nullarbor (Storr) are conspecific with P. gouldii. We also find the Pilbara population of P. monachus (Storr)
to be specifically distinct. As a consequence of this information, we synonymise Parasuta with its senior synonym Suta,
redescribe S. gouldii, S. monachus and S. spectabilis to clarify morphological and geographical boundaries and describe
S. gaikhorstorum sp. nov., which differs from all other described Suta species, including the geographically proximate
and similar-looking S. monachus, by a combination of molecular genetic markers, morphometric attributes, details of
colouration and scalation. The recognition of S. gaikhorstorum sp. nov. adds to the growing list of the many endemic
reptiles from this exceptionally diverse biotic region. We also designate a lectotype for S. spectabilis from the original
syntype series, highlight a distinctive population from the Great Victoria Desert in Western Australia and comment on
further unresolved issues regarding the relationships between S. dwyeri (Worrell) and S. nigriceps (Gȕnther).