172 Acarology 



12. Without well-developed pseudostigmata or pseudostigmatic organs 



on propodosoma 13 



With well-developed pseudostigmatic and pseudostigmatic organs 

 on propodosoma (Endeostigmata of Grandjean 1939) 16 



13. With "Rhagidia organ" on tarsus i; coxae i-ii and lu-iv in two 

 separate groups 14 



Without "Rhagidia organ" on tarsus i; coxae platelike, contigu- 

 ous; armored with lenslike eyes and usually with large, lenslike 

 organs behind eyes; with two pairs of genital suckers; palpal end 

 segment small, pointed, with long end setae Labidostommidae 



14. With small, distorted cheliceral shears, not for grasping 15 



With large, cheliceral shears, for grasping; body soft, with two 

 pairs of genital suckers; palpal end segment large, rounded, with 

 many short setae Rhagidiidae 



15. Soft-bodied, without projection over rostrum; with two pairs of 

 genital suckers Eupodidae 



Hard-armored, with projection or shield over rostrum; with two 

 pairs of genital suckers Penthalodidae 



16. With three pairs of genital suckers; eyes present or absent 17 

 With two pairs of genital suckers; eyes present or absent 18 



17. With single pair of sensory setae on propodosoma Terpnacaridae 

 With two pairs of sensory setae on propodosoma Pachygnathidae 



18. With two pairs of sensory setae on propodosoma 19 



With single pair of sensory setae on propodosoma; tarsi mono- 

 dactyle; no eyes Alicorhagiidae 



19. Tarsi with two or three claws 20 



Tarsi monodactyle; body clearly segmented; legs iv adapted for • 

 jumping; eyes probably present in all genera Nanorchestidae 



20. Legs i-iv tridactyle; no eyes; anterior pair of sensory setae in 

 special depression; fixed chela almost lacking Lordalychidae 



Leg I bidactyle; legs ii-iv tridactyle; two pairs of eyes; no special 

 depression for sensory setae; fixed chela normal Sphaerolichidae 



21. Movable chela developed into a straight, stylet-like, extrusible 

 piercing organ 22 



Movable chela strong, hinged non-extrusible piercing organ 26 



