MARESTE GAMMARIDEAN AMPHIPODA 219 



29. Gnathopods simple (like Harpinioides in Calliopiidae) (figs. 92d,p). 



Harpinioidella 

 Gnathopods subchelate 30 



30. Outer lobes of lower lip broadly separated, inner lobes large (fig. 90/), telson 



extending three fourths along rami of uropod 3 Meteusiroides 



Outer lobes of lower lip with small medial gap, inner lobes obsolescent or 

 absent (fig. 90^), telson extending one third or less along rami of uropod 

 3 31 



31. Inner lobes of lower lip small but distinct, inner plate of maxilla 2 with 



setae lining medial edge, upper lip rounded or truncate below, gnathopod 



2 small Pontogeneia ^ 



Inner lobes of lower lip absent, inner plate of maxilla 2 with one medioter- 

 minal seta, upper lip with small incision on ventral margin, gnathopod 2 

 very large (like Rhachotropis) Dautzenbergia 



32. Dactyls of pereopods 3 and 4 as long as article 6, pereopods very setose and 



oedicerotid-like (fig. 93^) Zaramilla 



Dactyls of pereopods 3 and 4 very short, pereopods poorly setose, slender . 33 



33. Lower lip with inner lobes 34 



Lower lip lacking inner lobes 37 



34. Coxa 4 not excavate posteriorly Prostebbingia 



Coxa 4 excavate posteriorly 35 



35. Body umbonate (fig. 90a) Eurymera 



Body not umbonate 36 



36. Inner lobes of lower lip very small, inner plate of maxilla 1 with setae mostly 



terminal Pontogeneia 



Inner lobes of lower lip large, inner plate of maxilla 1 with setae lining full 

 medial edge Pontogeneiella 



37. Coxa 4 deeply excavate posteriorly, upper lip rounded below, telson cleft 



halfway, maxillipedal palp article 4 shorter than article 3 . . . . Bovallia 

 Coxa 4 scarcely excavate posteriorly, upper lip slightly incised, telson cleft 

 one fifth, maxillipedal palp article 4 longer than article 3. 



(theoretical possibility) Dautzenbergia 



3 Also see Chosroes decjratus K. H. Barnard (1932), which is related to the type, C. incisus (Calliopiidae), 

 but which has a cleft telson and so inadvertently keys to Pontogeneia. 



Genera of Eusiridae 



Note: "eusirid" gnathopods have article 6 as broad as long and 

 attached to the produced apex of article 5. 



Accedomoera J. L. Barnard 



Accedomoera J. L. Barnard, 1964c. 



Type-species: Pontogeneia tricuspidata Gurjanova, 1938 (original 

 designation) . 



Accessory flagellum articulate, short; lower lip with small inner 

 lobes; inner plate of maxilla 1 with four or few^er terminal setae; 

 gnathopods not eusirid, subchelate, article 5 not lobate, shorter than 

 6, 6 as broad as 5 {Pseudomoera); pereopods 3-5 with each of articles 

 4-6 not distinctly longer than article 2. Species: 3, subantarctic, 

 boreal, N.W. Pacific, littoral. 



285-135 O - 69 - 15 



