GAMMARIDEAN AMPHIPODA 



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Figure 47. — Mouthparts and appendages of various species of Lysianassa. L. dissimilis 

 (Stout), Bahia de Los Angeles, Baja California: a, pereopod 5; b, pleonal epimeron 3; 

 c, epistome-upper lip complex; d, inner lobe of maxilla 1; e, uropod 3;/, outer plate of 

 maxilla 1. Lysianassa oculata, juvenile, southern California: g, outer lobe of maxilla 1; 

 h, inner lobe of maxilla 1. Lysianassa holme si, Bahia de San Quintin, Baja California: i, 

 outer plate of maxilla 1; ;', inner lobe of maxilla 1. 



species have been described from the Mediterranean, those marked 

 with asterisks being obscure: Lysianassa septentrionalis * (Delia 

 Valle, 1893) [=L. plumosa fide Stebbing, 1906], L. bispinosa (Delia 

 Valle, 1893) [later removed to Arugella by Pirlot, 1939], L. longicornis 

 Lucas, L. spinicornis * (Costa), L. loricata * (Costa), L. jilicornis * 

 (Costa) [the latter three considered by Stebbing (1906) as pos- 

 sible synonyms of L. longicornis, but there are obvious discrep- 

 ancies in this thinking if one examines original figures and descrip- 

 tions], L. ceratina (Walker) [considered a synomyn of L. longicornis 

 and originally described from outside the Mediterranean], L. punctata 

 (Costa) and L. pilicornis* Heller. Hence, the detection of L. costae 

 will be a difficult task and until it is recognized there can be little 

 nomenclatural rearranging in this and associated genera. But there 

 appears to be a good case for submerging several genera in the 

 Lysianassa-compiex if L. plumosa and L. costae are found to be 

 congeneric, Hurley (1963), in a most interesting discussion, has set 

 in motion the recombination of these genera by fusing Aruga Holmes 

 and Shoemakerella Pirlot with Lysianopsis Holmes. 



