I haven't looked into it much yet, but I would suggest one of the 4 (I think?) ant mimic genus or if not, a genus like Domoetas. These are the only ones I can think of off the top of my head with this distinctive body shape.
I've looked through photos Whyte & Anderson's guide (2017) and arachne.org and have come up with this list: Not Poecilipta sp (lack of speckled head) Not Bianor sp (very different abdomen shape) Perhaps Damoetas sp (potentially too small) Not Holoplatys sp (It's quite convex; it's not flat) Perhaps Judalana sp (potentially too small) Perhaps Ligonipes sp (difficult to tell if the brushes of hair are present on leg 1, however I think this is likely) Not Myrmarachne sp (leg 1 is not enlarged) Not Rhombonotus sp (too small - it's small size is specifically stated) Not Amyciaea sp (very different) Maybe this will help!
When I took the photo, Judalana lutea was suggested by the owner of the Amateur Entomology Australia site. I think the front legs were hairy? Yumi although I'm not sure (8 yeas ago) and my photographic skills on a small subject were pretty poor. Thanks for looking so hard for the id :) IT's not Holoplatys sp. The tags I have on this photo suggested Ligonipes sp.
Thanks Bron! I've taken a closer look today think J. lutea is most likely.
1. Fringes of hair on the tibia suggest Jodalana sp or Ligonipes sp with Ligonipes sp being more prominent. This would rule out Damoetas sp.
2. The length of the metatarsus + tarsus suggest Jodalana sp or Damoetas sp. I've noticed that this is quite long and thin on Ligonipes which doesn't stand out to me for this individual.
3. Colour ratio and distribution can vary for Jodalana lutea from a portion of the upper abdomen being yellow to the entire abdomen being yellow. I think it can vary on the legs too.