MARINE GAMMARIDEAN AMPHIPODA 197 



Siphonoecetes Kr0yer 



Siphonoecetes Kr0yer, 1845. — Stebbing, 1906. 



Type-species: S. typicus Kr0yer, 1845 (monotypy). See Stephensen, 

 1944a. 



Accessory flagellum absent; article 3 of antenna 1 subequal to article 

 1, flagellum subequal to or longer than article 3; antenna 2 slender or 

 slightly thickened, longer than antenna 1, flagellum shorter than 

 article 5; mandibular palp 1-articulate; coxae short, not touching 

 seriaUy; gnathopods weakly or normally subchelate; uropod 2 with 

 1-2 rami; uropod 3 with medially expanded peduncle, its single ramus 

 shorter than peduncle. Species: 9, arctic-boreal to ?antisubtropics, 

 littoral to bathyal (565 m). 



Unciola Say 



Unciola Say, 1818.— Stebbing, 1906. 



Glauconeme Kr0yer, 1845 (homonym, Bryozoa). 



Dryope and Driope Bate, 1862 (Z)r;/ope= homonym, Diptera). 



Type-species: U. irrorata Say, 1818 (monotypy). See Shoemaker, 

 1945b. 



Accessory flagellum elongate, multiarticulate or 1-articulate; article 

 3 of antenna 1 equal to article 1, flagellum subequal to peduncle; 

 antenna 2 of medium to strong stoutness, slightly shorter than antenna 

 1, flagellum subequal to article 5; mandibular palp 3-articulate; coxae 

 short, not touching serially; gnathopod 1 larger than gnathopod 2, 

 both normally subchelate or gnathopod 2 simple or parachelate; 

 uropod 2 biramous; uropod 3 often with medially expanded peduncle, 

 its single ramus slightly shorter than peduncle. Species: 15, arctic- 

 boreal, littoral to abyssal. 



Unciolella Chevreux 



Unciolella Chevreux, 1911a. 



Type-species: U. lunata Chevreux, 1911a (monotypy). 



Accessory flagellum 1-articulate, elongate or multiarticulate; article 

 3 of antenna 1 equal to or shorter than article 1, flagellum equal to 

 peduncle; antenna 2 slender, shorter than antenna 1, flagellum shorter 

 than article 5; mandibular palp 3-articulate; coxae short, touching or 

 not touching serially, with softly rounded corners; gnathopods nor- 

 mally subchelate, gnathopod 1 slightly the larger; uropod 2 biramous; 

 uropod 3 with its single ramus about 1.5 times longer than peduncle; 

 inner plate of maxilla 1 with one terminal seta {Neohela, Parunciola) . 

 Species: 2, Mediterranean and S. Atlantic, littoral (to 392 m). 



