80 ASELLOTA • JANIROIDEA 



late, exopod biarticulate. 9 : Pleopod 1 absent; pleopod 2, rami fused to form 

 operculum; pleopod 3 as in 6 . 



Key to families of Janiroidea 



1. Eyes (if present) on lateral processes of cephalon 2 



Eyes dorsolateral on cephalon, not on lateral processes 6 



2. Uropods with large, easily visible sympod and rami 3 



Uropods with sympod minute or absent, rami short 5 



3. Pleon posteriorly markedly produced; some pereonites produced 



laterally into fingerlike processes Pleurocopidae 



Pleon posteriorly rounded, barely produced; pereonites not laterally 

 produced into prominent fingerlike processes 4 



4. Pereopod 1 subchelate Santiidae 



Pereopod 1 ambulatory, biunguiculate Mexicope 



5. Pleopod 1 6 distally sagittate; anus covered by pleopod 1 d, or 



pleopod 2 $ Paramunnidae 



Pleopod 1 6 distally truncate; anus exposed Munnidae 



6. Uropodal rami minute, smaller than squat sympod Joeropsidae 



Uropodal rami elongate, sympod variable, generally elongate 7 



7. Eyes lacking; pereopods all similar, ambulatory .... Microparasellidae 

 Eyes usually present; pereopod 1 prehensile, subchelate, pereopods 



2-7 ambulatory Janiridae 



Family Incertae Sedis 



Mexicope Hooker, 1985 



DIAGNOSIS Eyes on short lateral lobes of cephalon. Scale present on anten- 

 nal peduncle. Coxae short, visible in dorsal view on pereonites 2—7. Per- 

 eonites laterally acute, not markedly produced. Pereopod 1 ambulatory, dac- 

 tylus biunguiculate. Pleon consisting of one short pleonite plus broad 

 pleotelson. Uropods large, with elongate peduncle, endopod, and exopod. 



