Composed of eighteen species within Australia. Semmons et al 1992 recorded 6 species (as Sejanus), but two of these species (S. brunneus and S. melaleucae) have been determined to be synonyms.
References:
Department of Climate Change, Energy, the Environment and Water. 2022. Australian Faunal Directory (https://biodiversity.org.au/afd/taxa/Ausejanus_mcdonaldi/checklist) Accessed May 29, 2025
Semmens T.D., McQuillan P.B., & Hayhurst G. (1992) Catalogue of the Insects of Tasmania. Department of Primary Industry. Tasmania