The described male has an abdomen mottled greyish brown and beige.
In the described male, the head and thorax are dark reddish brown, and the legs have darker rings. There are three pairs of humps on the back of the abdomen.
Male Austrarchaea christopheri have a brush of hairs on the front of their jaws and two pairs of small horns on the head. The male holotype was 3.17 millimetres long. A small leg-like appendage beside the mouth contains a distinctive long, rod-shaped structure.
The 2011 study included records from a collecting site represented only by juveniles. Three juveniles were collected in Cascades National Park on 17 April 2010. On the same day, the male holotype, other males and juveniles were collected in Dorrigo National Park. At both sites, the researchers sifted elevated leaf litter to find spiders.
DNA from six individuals from these collections was examined. Information from two mitochondrial genes complemented the detailed morphology of the males. Including genetic information from immature spiders allowed comparison of small specimens from different forests. Alongside the description of the identified males, the paper recorded that females remained unknown.
An extinction-risk assessment has not been added yet.
In 2011, the authors noted a relatively widespread distribution across several national parks protected under World Heritage legislation and did not then consider the species of conservation concern. Maintaining forest habitat and checking present-day occurrence with identifiable vouchers would help update that historical information.