Subgenus Petrobia Murray s. str.

Diagnosis. Based on Khanjani et al. (2016).

Peritremes anastomosing, terminating in a large or sometimes small multi-chambered bulb; dorsal body setae short, usually not extending past bases of setae in subsequent row, body setae usually not on tubercles, but sometimes caudal setae f 1–2 and h 1 on tubercles; solenidia present on tarsi III and IV.