MARINE GAMMARIDEAN AMPHIPODA 209 



Haustorioides Oldevig 



Haustorioides Oldevig, 1958. 



Type-species: H. munsterhjelmi Oldevig, 1958 (monotypy). 

 Species: 1, boreal Pacific, littoral. 



Eophliantidae 



[Sheard, 1936a, elevated by Gurjanova, 1958] 



Figures 87, 88 



Diagnosis. — Accessory fiagelliim absent; body cylindrical; all 

 coxae short, generally not touching; mandible lacking palp, molar 

 vestigial or absent; palp of maxilla 1 degraded or absent; gnathopods 

 usually feeble; uropod 3 becoming degenerate; telson short, weakly 

 to fully cleft. See Prophliantidae, Phliantidae, Talitroidea, Kuriidae, 

 Colomastigidae. 



Description. — Body vermiform, head globular, lacking rostrum, 

 urosome tending to be reduced and its segments coalesced, uropod 3 

 becoming degenerate, with two, one or no rami; accessory flagellum 

 absent; mandible lacking palp and molar obsolescent; palp of maxilla 

 1 small, 1-articulate or absent; remaining mouthparts basic; gnatho- 

 pods feeble, simple or weakly subchelate or parachelate, article 3 of 

 gnathopods occasionally elongate; telson short, weakly to fully cleft; 

 pleopods biramous or uniramous, requiring further study in the 

 several genera. 



Uropod 3 and its relationship to the urosome need careful study; 

 it is necessary to distinguish clearly pleonite 6, the peduncle of 

 uropod 3, and its ramus. Sometimes pleonite 6 is fused to 5 but a 

 peduncle of uropod 3 may be confused with the segment if one mistakes 

 a ramus for a peduncle. 



Kelationship. — The Phliantidae differ from the Eophliantidae by 

 their depressed or compressed bodies with long coxae. 



The Talitroidea differ by their strongly triturative mandibular 

 molars (except Najna) and compressed bodies. 



The Colomastigidae have cylindrical bodies but the inner plates 

 of the maxillipeds are very small, the telson is cleft, and the mandib- 

 ular cutting edge is divided into large teeth. 



Eophliantidae may resemble Corophiidae and Podoceridae because 

 of their depressed, subcylindrical bodies but the latter two families 

 have mandibular palps and molars. 



