MARLNIE GAMMARIDEAN AMPHIPODA 293 



Key to the Genera of Liljeborgiidae 



Gnathopod 1 larger than gnathopod 2 (fig. 1156) Idunella 



Gnathopod 1 smaller than or equal to gnathopod 2 (fig. 115a) 2 



Article 5 of gnathopods 1-2 strongly produced, slender and elongate (fig. 116g) ; 



outer ramus of uropod 3 always simple (fig. llQi) Liljeborgia 



Article 5 of gnathopods 1-2 weakly produced, thick and blunt (fig. 116/); 



outer ramus of uropod 3 usually composed of two articles (fig. ll&k) 



Listriella 



Figure 116. — Liljeborgiidae: Liljeborgia brevicornis (Bruzelius) (Sars, 1895, pi. 187, as 

 L. pallida): a, upper lip; b, mandible; c, lower lip; d,e, maxillae 1, 2;/, maxilliped; g, 

 gnathopod 2; h, telson; z, uropod 3. Gnathopod 2: /, Listriella goleta J. L. Barnard (1959b). 

 Uropod 3: k, Listriella diffusa J. L. Barnard (1959b); /, Listriella eriopisa J. L. Barnard 

 (1959b). 



Genera of Liljeborgiidae 



Idunella Sars 



Idunella Sars, 1895.— Stebbing, 1906.— J. L. Barnard, 1959b. 

 Sextonia Chevreux, 1920. 



Type-species: Liljeboria aequicornis Sars, 1876 (monotypy). See 

 Sars, 1895. 



Species: 4, subarctic, warm-temperate of N. Atlantic, tropical 

 Indian Ocean, Japan, littoral to bathyal (763 m). 



