While both Moths of Victoria, part 3 and Lepidptera Butterfly House name this species as Chrysolarentisa microcyma, i have followed the current practice of the ALA and the Australian Faunal Direcory and identified it as 'Unplaced microcyma"
If I type in 'Unplaced microcyma' into the AFD search box online the resu.lt is this:- ' Species Unplaced microcyma (Guest, 1887) Cephalissa microcyma Guest, E. 1887. A classified list of Geometrina found around Balhannah, with notes on species. Transactions of the Royal Society of South Australia 9: 126-141 [128]. Type data: Syntype(s) [Australia]: South Australia, Balhannah. Hydriomena microcyma Meyrick, E. 1891. Revision of Australian Lepidoptera. IV. Proceedings of the Linnean Society of New South Wales 2 5[1890](4): 791-879 [840]. Type data: Syntype(s) BMNH 4, ♂, ♀, Australia: Tasmania, Campbelltown; Georges Bay; South Australia, Mt Lofty. Species Unplaced microcyma (Guest, 1887) Cephalissa microcyma Guest, E. 1887. A classified list of Geometrina found around Balhannah, with notes on species. Transactions of the Royal Society of South Australia 9: 126-141 [128]. Type data: Syntype(s) [Australia]: South Australia, Balhannah. Hydriomena microcyma Meyrick, E. 1891. Revision of Australian Lepidoptera. IV. Proceedings of the Linnean Society of New South Wales 2 5[1890](4): 791-879 [840]. Type data: Syntype(s) BMNH 4, ♂, ♀, Australia: Tasmania, Campbelltown; Georges Bay; South Australia, Mt Lofty.' No mention that this name has synonym status. If I type in 'Chrysolarentia microcyma' the response is: 'No names found matching Chrysolarentia microcyma'