Thamnocephalinae Packard, 1883
Thamnocephalidae Simon, 1886; Linder, 1941 Branchinellinae Daday, 1910
Penes are close set with soft basal parts. Penes with one or more longitudinal rows of spines. Eversible portion becoming explanate distally. Vas deferens looped. Seminal vesicles are absent. Second maxillae with single apical setae. Mandibles without a palp. Eleven pairs of legs, each bearing a single praeepipodite. 6 to 60mm. Approximately 36 species total, reported from all continents except Antarctica.