MARESflB GAMMARIDEAiN AMPHIPODA 



453 



The absence of a mandibular molar distinguishes Stilipedidae from 

 the Synopiidae and Hyperiopsidae. Stilipedids resemble the Par- 

 daliscidae in the mandible but differ by the long coxae and the 

 foliaceous second maxillae. The first maxillary palp of some pardali- 

 scids is foliaceous but not the inner plate. Pardaliscids have a multi- 

 articulate accessory fiagellum (except Halicoides). 



Figure 164.— Stilipedidae: Mandible: a,b, Stilipes sanguineus (Hurley, 1954e). Upper 

 lip: c, Alexandrella dentata Chevreux (1912b); d, Stilipes sanguineus. Lower lip: e, Stilipes 

 sanguineus; /, Alexandrella. Gnathopod 2: g, Alexandrella. Gnathopods 1, 2: h,i, 

 Stilipes sanguineus. Telson: /, Stilipes distincta Holmes (1908). Uropod 3: k, Stilipes 

 distincta. 



Key to the Genera of Stilipedidae 



1. Palp of maxilliped greatly exceeding outer plate (fig. 163/), upper lip very 



weakly emarginate (fig. 164(i) Stilipes 



Palp of maxilliped not exceeding outer plate (fig. 163e), upper lip deeply 

 incised (fig. 164c) Alexandrella 



Genera of Stilipedidae 

 Alexandrella Chevreux, new synonymy 



Alexandrella Chevreux, 1911c; 1912a; 1912b. 

 Astyroides Birstein and Vinogradova, 1960. 



