This is Myriophyllum crispatum: there are too many leaves per whorl to be M. simulans. Its not clear (in the photo) if there are crisped hairs on the stem (diagnostic for M. crispatum, if present).
The furthest you can get with this is Perginae. This is one of the Myrtaceae feeding genera which includes Acanthoperga, Antiperga, Paraperga, Perga, Peragrapta, Pseudoperga and Xyloperga.
As there is are no systematic references or diagnostic characteristics of the larvae and with over 50 species within this grouping, it's almost impossible to determine the species, let alone genera in which they belong to.
I will check this. Having the wrong name can be a problem but so could having the wrong species. When I was told the species I noted that M. papillosum is not on the ACT Plant Census.
Mike this is the second posting in two days of a plant used in wetland restoration that was not the species thought to be planted - the other was of a Marselia species at Hackett. Fortunately in both cases the species mis-planted was in fact a local species, but perhaps we should keep an eye on this - what are the details of your planting
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