Family Protentomobryidae Folsom, 1937 (Fossil Collembola)

This family contains two genera, separated as follows:—

1.	Body with large dorsal horn-like structure arising dorsally on the mesothorax and projecting posteriorly over the metathorax	Stylonotus Olfers, 1907 (805)
	Body without such structure; Abd. VI with suranal and subanal valves	Protentomobrya Folsom, 1937 (468)