Atlantasellus cavemicolus 75 



belong to the superfamily Janiroidea, considered to be the most advanced. In 

 place of a key to the four superfamilies, the chart shown in Figure 34 illus- 

 trates diagrammatically the arrangement of the pleopods in these groups. 



Superfamily Aselloidea Rafinesque-Schmaltz, 1815 



DIAGNOSIS 6 : Pleopod 1 , peduncles separate, rami uniarticulate; pleopod 2 

 having biarticulate exopod and copulatory endopod; pleopod 3 biramous, 

 opercular. 9: Pleopod 1 absent; pleopod 2 absent, or of single article; 

 pleopod 3 biramous, opercular. 



Family Atlantasellidae Sket, 1979 



DIAGNOSIS Body resembling that of a sphaeromatid isopod. Pleon consist- 

 ing of two free pleonites plus pleotelson. S: Pleopod 1 of two articles; pleopod 

 2 with sympod, small exopod, and uniarticulate copulatory endopod. 9 : 

 Pleopods 1 and 2 absent; pleopod 3 operculate but rami not fused. 



Atlantasellus Sket, 1979 



DIAGNOSIS Eyes lacking. Antennule flattened, short and broad. Antenna 

 elongate, peduncle of four (?five) articles, flagellum of four articles. Man- 

 dibular palp of three articles; with incisor and lacinia, molar replaced by 

 brushlike process. Maxillipedal palp of five articles of similar width and 

 broad endite. Pereopod 1 subchelate; pereopods 2-7 ambulatory, slender, 

 dactyli biunguiculate. Uropods uniarticulate, vestigial. 



Atlantasellus cavernicolus Sket, 1979 

 Figure 35 



DIAGNOSIS d 1.1 mm. Cephalon with strong triangular rostrum, equal to 

 pereonites 1-3 combined in middorsal length. Pleotelson basally broad, 

 tapering to trilobed posterior margin, uropods inserted in incisions between 

 median and lateral lobes. 



RECORDS Walsingham Cave, Bermuda. 



