MARINE GAMMARIDEAN AMPHIPODA 279 



Ischyrocerus Kr0yer 



Ischyrocerus Kr0yer, 1838. — Stebbing, 1906. 



Type-species: /. anguipes Kr0yer, 1838 (monotypy). See Sars, 

 1895. 



Accessory flagellum 2-articiilate, elongate; article 6 of gnathopod 1 

 longer than article 5; coxa 1 more than three fourths as long as coxa 2, 

 coxa 5 longer than coxa 6 ; article 6 of male gnathopod 2 lacking large 

 posteroproximal tooth; outer ramus of uropocl 3 with or without basally 

 immersed, unhooked terminal spine, distolateral margin usually with 

 perpendicular, blunt, jnostly very minute denticles (Jassa). Species: 

 32, possibly cosmopolitan but primarily boreal, littoral to bathyal 

 (2,090 m). 



Jassa Leach 



Jassa Leach, 1814a. — Stebbing, 1906. ■ 



Lusyta Nardo, 1847. 



Cratophium Dana, 1852b. 



Macleayia Haswell, 1880a. 



WyvUlea Haswell, 1880c. 



Bruzeliella Norman, 1905. 



Hemijassa Walker, 1907. 



Type-species: Cancer falcatus Montagu, 1808 (selected by 

 Chevreux and Fage, 1925; indicated by subsequent montoypy 

 through elimination by Stebbing, 1899a, and thereafter synonomy 

 of species). See Sars, 1895 (as Podocerus falcatus) . 



Accessory flagellum 2-articulate, elongate; article 6 of gnathopod 

 1 longer than article 5; coxa 1 more than three fourths as long as 

 coxa 2, coxa 5 longer than coxa 6; article 6 of male gnathopod 2 usually 

 bearing a large posteroproximal tooth; outer ramus of uropod 3 with 

 distal, basally immersed, hooked spine, distolateral margin with 1-3 

 large, sharp, reverted scales {Ischyrocerus). Species: 7, cosmopolitan, 

 littoral. 



Microjassa Stebbing 



Microjassa Stebbing, 1899b; 1906. 



Ty])e-species : Podocerus cumbrensis Stebbing and Robertson, 

 1891 (monotypy). See Chevreux and Fage, 1925. 



Accessory flagellum 1-articulate, very small; article 6 of gnathopod 

 1 longer than article 5; coxa 1 less than half as long as coxa 2; coxa 

 5 not longer than coxa 6. Species: 2, E. Atlantic, E. Pacific, littoral. 



Parajassa Stebbing 



Janassa Boeck, 1871 (homonym, Pisces). 



Parajassa Stebbing 1899a; 1906 (new name for Janassa). 



