ONISCIDEA 247 



Key to genera and species of littoral Oniscidea 



1. At least one uropodal ramus reaching well beyond outline of body ... 5 

 Uropodal rami very short, not reaching beyond outline of body 2 



2. Uropods ventral, not visible in dorsal view 3 (Tylos) 



Uropods visible in dorsal view Armadilloniscus ninae 



3. Ventral extensions of pleonite 5 meeting in midline Tylos niveus 



Ventral extensions of pleonite 5 not meeting in midline 4 



4. Ventral extensions of pleonite 5 very short, obsolete Tylos wegeneri 



Ventral extensions of pleonite 5 well separated Tylos marcuzzii 



Ventral extensions of pleonite 5 just falling short of meeting in midline 



Tylos latreillei 



5. Uropodal rami both elongate, subequal 6 (Ligia) 



Uropodal rami very unequal in length 8 



6. Propodus of 6 pereopod 1 with distal rounded lobe Ligia exotica 



Propodus of 6 pereopod 1 lacking rounded lobe 7 



7. Apex of 6 pleopod 2 club shaped Ligia olfersii 



Apex of 6 pleopod 2 bifid Ligia baudiniana 



8. Antennal flagellum of two articles Rhyscotus texensis 



Antennal flagellum of three articles 9 (Vandeloscia) 



9. Endopod of 6 pleopod 1 with large scalelike subapical process 



Vandeloscia riedli 



Endopod of S pleopod 1 with small scalelike subapical process 



Vandeloscia culebrae 



Armadilloniscus Ul'yanin, 1875 



Armadilloniscus ninae Schultz, 1984 

 Figure 106A 



DIAGNOSIS 6 3.2 mm, 9 4.1 mm. Uropodal sympod expanded to form part 

 of body outline; rami set mesial to expanded base, with exopod half length of 

 endopod. 



RECORDS Ambergris Cay, Belize; under damp objects along beach drift 

 line. 



