MARINE GAMMARIDEAN AMPHIPODA 149 



intermediate genus. This procedure would also justify combining the 

 remaining Aoridae with the Isaeidae (Photidae) and might eventually 

 result in the Ischyroceridae also being joined to the Isaeidae, perhaps 

 as a subfamily. 



Key to Genera of Aoridae 



[males and male-lire females] 



1 . Article 4 of gnathopod 1 produced into a long tooth (merochelate) (fig. 63z) I 2 

 Article 4 of gnathopod 1 not produced into a long tooth (occasionally with 



a short tooth)^ 3 



2. Accessory flagellum long, composed of three or more articles .... Aora 

 Accessory flagellum absent Aoroides 



3. Article 5 of gnathopod 1 with one or more strong distal or subposterior teeth 



(carpochelate) (fig. 64j) 4 



Article 5 of gnathopod 1 lacking a strong distal tooth (fig. 63^) .... 11 



4. Uropod 3 uniramous (fig. 63p) Neomicrodeutopus 



Uropod 3 biramous (figs. 63n,q) 5 



5. Gnathopod 1 of both sexes alike Hansenella 



Gnathopod 1 differing in each sex 6 



6. Gnathopod 2 heavily setose on full anterior edge of article 5 (fig. 64^) . 7 

 Gnathopod 2 sparsely setose on anterior edge of article 5 or setae compacted 



into a distal bundle only 10 



7. Article 6 of gnathopod 1 as long and as broad as article 5 (fig. 63m). 



Lembopsis 

 Article 6 of gnathopod 1 shorter and/or narrower than article 5 (fig. 63/) . 8 



8. Article 5 of gnathopod 2 longest (fig. Mg), female gnathopod 1 simple (like 



fig. 64/) Neomegamphopus 



Article 6 of gnathopod 2 longest, female gnathopod 1 subchelate (fig. 63h) . 9 



9. Head elongate, antenna 2 attached halfway back on ventral cephalic margin, 



gnathopod 2 of male as stout as 1, of female weakly setose anteriorly. 



Amphideutopus 



Head not elongate, antenna 2 attached to anteroventral corner of head in 



front of eye, gnathopod 2 of male much more slender than 1, of female 



densely setose anteriorly Coremapus 



10. Inner ramus of uropod 3 less than half as long as outer ramus (fig. 63g). 



Acuminodeutopus 

 Rami of uropod 3 subequal (fig. 63n) Microdeutopus 



11. Uropod 3 lacking rami Uncinotarsus 



Uropod 3 with at least one ramus 12 



12. Rami of uropod 3 minute, less than half as long as peduncle (fig. 63o) . 13 ^ 

 Rami of uropod 3 not minute, as long as or longer than peduncle . . 14 



13. Pleonite 6 evanescent dorsally, article 3 of antenna 1 shorter than article 1, 



accessory flagellum vestigial Dryopoides, female 



' Note that juvenile males oiAora and Aoroides have a very short tooth and thus may key to Lembos but 

 gnathopod 1 of Lembos is always strongly subchelate, whereas gnathopod 1 ol Aora and Aoroides is essentially 

 simple. 



2 These genera may belong with the Ischyroceridae. 



