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Couplet 1

Leg tarsi III and IV with two simple claws; dorsum of abdomen with a hump
Phalangodidae, Bishopella

Leg tarsi III and IV with a complex claw having a single point of attachment; abdomen without a distinct hump
go to Couplet 2

Couplet 2

Leg femora I with anterior and posterior rows of spined tubercles that are almost twice the width of the leg segment
Trianenonychidae, Fumontana

Leg femora I with at most small tubercles and spines
Cladonychiidae, go to Couplet 3

Couplet 3- Cladonychiidae

Moveable finger of chelicerae not enlarged; ovipositor with numerous setae on lateral lobes
Erebomaster

Moveable finger of chelicerae enlarged in males; ovipositor with only two setae on lateral lobes
Theromaster