GAMMARIDEAN AMPHIPODA 



185 



Division 1 A-B has no available subgeneric appellation unless 

 Lysianassa costae proves to belong to the group ; division 2 A-B has 

 3 generic names available, Arugella, Shoemaker ella, and Pronannonyx, 

 and possibly a fourth, Lysianassa, if L. costae proves to be the senior 

 synonym of L. bispinosa; division 3 A-B has Aruga as a name but 

 division 4 is composed only of Aruga dissimilis. 



Apparently no well known Mediterranean species has characters 

 similar to Sars' analysis of L. plumosa (having a 2-articulate outer 

 ramus of uropod 3) ; presuming one of those is L. costae the type 

 species of Lysianassa will represent a point of departure from all 

 other species assigned to it as of 1940, except L. coelochir. 



Divisions of "Lysianassa" 



Division Characters 



(Uropod 3, outer ramus 1-articulate 

 Uropod 3, peduncle not lamelliform 

 Epistome as long as upper lip 



(Uropod 3, outer ramus 1-articulate 

 Uropod 3, peduncle lamelliform 

 Epistome as long as upper lip 



(Uropod 3, outer ramus 1-articulate 

 Uropod 3, peduncle not lamelliform 

 Upper lip projecting farther than 

 epistome 



2 B^ 



3 A 



Uropod 3, outer ramus 1-articulate 

 Uropod 3, peduncle lamelliform 

 Upper lip projecting farther than 

 epistome 



'Uropod 3, outer ramus 2-articulate 

 Uropod 3, peduncle not lamelliform 

 Upper lip projecting farther than 

 epistome 



Uropod 3, outer ramus 2-articulate 



R I Uropod 3, peduncle lamelliform 

 I Upper lip projecting farther than 

 epistome 



Uropod 3, outer ramus 2-articulatc 

 Uropod 3, peduncle not lamelliform 

 .Epistome as long as upper lip 



Species 



(Lysianassa bonairensis l 

 Lysianassa ceratina 

 Lysianassa longicornis 



(Aruga macromerus 

 Lysianassa pariter, n.sp. 



[Lysianassa cinghalensis 

 Lysianassa dartevillei 

 (Lysianassa hypocrita) 



^Lysianassa variegata 



Lysianassa coelochir 

 Arugella heterodonta 

 Lysianassa falcata 

 Arugella bispinosa 

 Shoemakerella cubensis 2 

 Pronannonyx minimus 

 (Socarnella bonnieri) 



I Lysianassa plumosa 

 I (model of genus herein) 



Aruga oculata 

 Lysianopsis alba 3 



( = L. hummelincki) 

 Aruga holmesi 

 Aruga subantarctica 

 Arugella falklandica 



Aruga dissimilis 



1 Possibly equals Scocarnella, fide Hurley (1963) in view of unconstrieted inner ramus of uropod 2, 



- Equals Shoemakerella nasuta of Pirlot, not Dana. 



3 Hurley (1963) confirms the 2-articulate condition of uropod 3 outer ramus. 



Note.— Table does not include L. punctata (Costa), L. costae Milne Edwards, and L. nasuta Dana. 



