Males and females have a single hump on the back of the abdomen.
The described male has a yellowish-brown abdomen mottled with brown and covered with many white hairs. The described female is generally darker than the male.
Eriauchenus workmani has long jaws extending in front of its body. Four projections on its head each bear a short spine. In the male described in detail in 2018, total length was 4.27 millimetres and jaw length was 4.02 millimetres.
The species account also preserves records of young emerging from egg sacs. Two females collected in Sahamalaotra Forest in Ranomafana National Park were each accompanied by an egg sac. According to the 2018 study, the sacs hatched in captivity, producing approximately 20 juveniles from one and approximately 30 from the other.
The specimens were collected during 26 December 2005–14 January 2006. Their collection data mention beating vegetation containing clumps of dead, dry foliage. Among material used to compare adult morphology, the study preserved information about egg sacs and the juveniles that emerged from them. These events after collection add life-history observations to the anatomical descriptions.
An extinction-risk assessment has not been added yet.
The 2018 study assembled material from eastern Madagascan forests, including Ranomafana. Records of specimens accompanied by egg sacs support attention to vegetation and dead-foliage microhabitats when maintaining habitat and revisiting collection sites.