The described male and female have an abdomen mottled greyish brown and beige.
In the described male and female, 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 mascordi have a brush of accessory hairs on the front of the chelicerae, whereas the described female lacks these hairs. Although both sexes share similar coloration, their mouthparts differ in this detail. The male holotype measured 2.83 mm long and the female allotype 3.28 mm. The hairs provide a difference separate from body size.
On 12–13 April 2010, specimens were obtained from elevated litter beneath tree ferns near Gemini Road at 1,159 metres. A male was collected beneath bracken near Breeza Lookout at 1,128 metres during the same dates. The 2011 study genotyped one female and two juveniles from the first locality and one male from the second. Six diagnostic COI/COII nucleotide differences separated these four from the other taxa compared, connecting specimens from the two localities through morphology and genetic evidence.
An extinction-risk assessment has not been added yet.
The Coolah Tops National Park management plan identifies invasive plants as a conservation issue. Prepared in 2002 and adopted in 2003, it calls for continuing monitoring and treatment of blackberry and for monitoring vegetation recovering from past logging and grazing. These are regional policies for maintaining forest habitat, including the litter environments occupied by this spider.