The described male has an abdomen mottled greyish brown and dark beige.
In the described male, the legs are tan brown with darker rings. There are three pairs of humps on the back of the abdomen.
Female Austrarchaea clyneae hold an egg sac behind the abdomen using the fourth pair of legs. The sac is irregular and dirt-like in shape, made from parchment-like brown silk.
The 2022 paper illustrates a female carrying an egg sac. This specimen was collected beneath a log in cool-temperate Nothofagus moorei rainforest on the summit of Mount Ballow, Mount Barney National Park, at 1,307 metres in December 2018.
The study formally described the female for the first time; the examined female measured 3.45 millimetres long. Alongside morphology, the account documented the shape of the egg sac and how it was held.
An extinction-risk assessment has not been added yet.
The 2022 surveys expanded the known range beyond Mount Clunie to the southern Main Range and western Mount Barney. Many new collections followed the 2019–2020 fires. The authors discuss potentially differing fire and climate risks among species and localities. Repeated surveys across the known sites could help track this species.