MARENTE GAMMARIDEAN AMPHIPODA 349 



Lysianella Sars 



Lysianella Sars, 1882. — Stebbing, 1906. 



Type-species: L. petalocera Sars, 1882 (original designation). See 

 Sars, 1895. 



Article 4 of antenna 2 tumid, article 5 slender; upper lip lobately 

 produced in front of epistome; mandibular molar vestigial, palp at- 

 tached proximal to molar; gnathopod 1 subchelate, often weakly, 

 articles 5 and 6 equal; inner ramus of uropod 2 constricted or not; 

 telson of medium length, entire or cleft 25 percent. Species: 3, 

 boreal and subtropical Atlantic and Mediterranean, littoral to abyssal. 



Menigrates Boeck 



Menigrates Boeck, 1871. — Stebbing, 1906. 



Type-species: Anonyx obtusifrons Boeck, 1861 (monotypy). See 

 Sars, 1895. 



Upper lip and epistome not differentially j^roduced, inconspicuous; 

 mandibular molar obsolescent, an undifferentiated lamina, palp at- 

 tached slightly proximal to molar; gnathopod 1 sunple, article 6 

 longer than 5; telson short, cleft one third (type) or a quarter or less; 

 peduncular articles 2 and 3 of antenna 1 short, half as long as article 1 

 of jlagellum (Waldeckia and Socarnes). See Paralihrotus. Species: 3, 

 subarctic, littoral. 



Menigratopsis Dahl 



Menigratopsis Dahl, 1945. 



Type-species: M. svenillsoni T>ah\, 1945 (monotypy). 



Epistome and upper lip indistinct from each other; mandibular 

 molar well developed, but possibly not triturative, palp attached 

 level with molar; gnathopod 1 simple, article 5 slightly longer than 

 article 6; telson of medium length, deeply cleft. Species: 1, the 

 Sound between Sweden and Denmark, littoral. 



Mesocyclocaris Birstein and Vinogradov 



Mesocyclocaris Birstein and Vinogradov, 1964. 



Type-species: M. gracilis Birstein and Vinogradov, 1964 (mono- 

 typy)- 



Accessory flagellum absent; mandible lacking molar and palp; 

 gnathopod 1 simple, article 5 longer than 6; coxae 1 and 2 much 

 smaller than coxae 3 and 4 and probably partially hidden by coxa 3 ; 

 pereopods 1-5 prehensile; uropod 3 elongate, rami interequal, outer 

 1-articulate; [telson unclear]. Species: 1, Indian Ocean, bathypelagic. 



