Rationale
Peringuey's Seedpod Shieldback (Thoracistus peringuey) is Critically Endangered (Possibly extinct) under criterion B2 because it has an estimated area of occupancy of 4 km2, it occurs only in one location in Lydenburg District, Mpumalanga Province, South Africa, and the area, extent and quality of its habitat are estimated to be in decline. It was described from one male and one female specimen collected prior to 1879 and has not been collected since. Its highly restricted distribution means that even a small disturbance can have a detrimental effect on the survival of the species as a whole. The most likely threats to the species are change in microclimate or distribution of the species' food plants as a result of climate change, agricultural cultivation, or increased grazing by wildlife or livestock. Due to its small body size and low motility, this species cannot be expected to shift its range in response to changes in its habitat.