MARINE GAMMARIDEAN AMPHIPODA 397 



Uschakoviella Gurjanova 



Uschakoviella Gurjanova, 1955. 



Type-species: U. echinophora Gurjanova, 1955 (original designa- 

 tion). See Shoemaker, 1964. 



Body covered with articulate spines; accessory flagellum absent; 

 lower lip lacking inner lobes; mandibular molar large, ridged; maxilli- 

 pedal palp 4-articulate ; gnathopods scarcely subchelate, but palms 

 transverse; telson cleft slightly. Species: 1, boreal N. Pacific, 

 littoral to abyssal. 



Pardaliscidae 



Figures 143, 144 



Diagnosis. — Mandible lacking molar; inner plates of maxillipeds 

 small or vestigial; coxae all short; accessory flagellum present, well 

 developed, often sexually dimorphic. See Stilipedidae, Acantho- 

 notozomatidae. 



Description. — Accessory flagellum multiarticulate, often sexually 

 dimorphic ("lacking" in one genus), base of primary flagellum often 

 conjoint in male; rostrum usually prominent, head occasionally like 

 that of Pseudotiron in Synopiidae; upper lip incised or rounded; man- 

 dibles flat, almost elytriform; molar of mandible absent, palp 3- 

 articulate or absent, article 3 often shortened; inner plates of max- 

 illipeds evanescent, outer plates occasionally small; coxae very short; 

 gnathopods powerful or feeble; rami of uropod 3 elongate, lanceolate 

 or subfoliaceous; telson rarely elongate but often of medium length, 

 deeply cleft or entire; mouthparts grouped quadrately (except coni- 

 cally in Halicella). 



Relationship. — The Stilipedidae differ from the PardaUscidae in 

 the complete absence of an accessory flagellum. Halicoides, assigned to 

 Pardaliscidae, also lacks an accessory flagellum (but see Birstein and 

 Vinogradov, 1960), bears a peculiar process on article 2 of antenna 1 

 but has other aspects of the Pardaliscidae. Both pairs of maxillae in 

 stiUpedids are highly foliaceous, unhke those of pardaliscids. 



Halicella of the Pardaliscidae has its mouthparts formed into a 

 conical bundle like the Acanthonotozomatidae but its coxae are short, 

 and the inner plates of its maxilliped are absent. Acanthonotozomatids 

 have long coxae and well-developed inner plates of the maxillipeds, 

 as do Astyridae. 



Laphystiopsidae have well-developed inner plates of the maxilliped, 

 a distinct mandibular molar and lack an accessory flagellum. 



