Systematics Monophyly of Elhamma supported by presence of only two M viens in the hindwings and strongly cup-shaped juxta in the male genitalia, bot features being unique within the Hepialidae (Simonsen, 2015). The male valves of the New Guinea species appear to support a central protuberance that may be homologous (albeit much reduced) with the Australian species.
References Simonsen, S.J. 2015.Elhamma Walker (Lepidoptera: Hepialidae) revisited: adult morphology, assessment of recently proposed synonyms and descriptions of two species. ZooTaxa 3955: 301-328 Viette, P. 1952. Contribution à l'étude des Hepialidae (28e note). Results of the Archibold Expeditions. Nouveaux genres et espèces néo-guinéens. Treubia 21, 257-262.
Elhamma australasiae female. Image courtesy John Nielsen
Distribution of New Guinea Elhamma species based on specimen records. Filled circle, E. viettei; open circle, E. grehani; filled square, E. toxopeusi; open square, E. diakonoffi; crossed square, E. roebkei (map from Simonsen, 2015).
Elhamma australasiae distribution. Reproduced from Simonsen (2015)
Eggs. Victoria. February 26, 2017. Photo courtesy of Nick Temby
Elhamma and other moths at light, March 2015. Image courtesy of Nick Temby.