Stylocellidae

Clouse, Ronald M., 2012, The lineages of Stylocellidae (Arachnida: Opiliones: Cyphophthalmi), Zootaxa 3595 (1), pp. 1-34 : 32

Diagnostic key to subfamilies and genera of Stylocellidae

1 Coxae IV large and with lateral edges parallel to long body axis; posterior prosoma clearly bulging, constituting the widest part of the body; ozophores pointing perpendicular to long body axis..............Fangensinae subfam. nov. .............2

- Coxae IV tapered anteriorally; ozophores or opisthosoma the widest part of the body; ozophores pointing anteriorally..... 3

2 Eyes absent, Rambla’s organ small and raised, gonostome small and rounded anteriorally, dorsal scutum arched... Fangensis

- Eyes present, Rambla’s organ large and depressed, gonostome more rectangular than semicircular, dorsal scutum flat............................................................................................ Giribetia gen. nov.

3 With the following combination of characters: Rambla’s organ present and large but lacking distinct edges; ozophores relatively large and parallel-sided; dorsal scutum strongly arched; ventral opisthosomal sulci sinusoidal or distinctly depressed; chelicerae claw-like, attenuate forms missing; gonostome large with weakly concave posterior; eyes present and large...... Stylocellinae........................................................................................ 4

- With the following combination of characters: Rambla’s organ rare, but if present, then distinct and often scaly in appearance, even if small; ozophores usually tapering; dorsal scutum often flat; ventral opisthosomal sulci often parallel or weakly curved; chelicerae variable, often not claw-like, attenuate forms common; gonostome and eyes highly variable.................. Leptopsalinae subfam. nov. ............................................................................. 5

4 Rambla’s organ faint and diffuse; anal gland pore large, accompanied by distinct anal plate sculpturing; second cheliceral article sculpturing extensive and bordered by low ridge; ventral opisthosomal sculci distinctly sinusoidal.......... Stylocellus

- Rambla’s organ large, depressed, and making the male fourth tarsus scoop-like; anal gland pore rare, but if present, then small, accompanied by indistinct anal plate sculpturing; second cheliceral article sculpturing highly reduced; ventral opisthosoma deeply depressed............................................................................. Meghalaya

5 Rambla’s organ absent; anal gland pores nearly always absent; eyes nearly always present; second cheliceral sculpturing usually reduced; ventral opisthosomal sulci usually curved; dorsal scutum usually arched; pronotum compact and ventral prosomal complex compressed, with short meeting points between coxae II and IV and an indistinct or missing sternum; posterior gonostome usually concave................................................................ Leptopsalis

- Rambla’s organ sometimes present; anal gland pores common; eyes ranging from missing to large and bulging; second cheliceral sculpturing usually extensive; ventral opisthosomal sulci usually parallel; dorsal scutum usually flattened; pronotum long and ventral prosomal complex long and flat, with long meeting points between coxae II and IV and a distinct sternum; posterior gonostome usually straight................................................................... Miopsalis