MARINE GAMMARIDEAN AMPHIPODA 143 



uropods, but the degeneration of mouthparts and coxae and the sub- 

 cylindrical body mark it as an eophliantid. 



The shape of uropod 3 distinguishes the Ampithoidae from the 

 Calliopiidae, Pleustidae, and Oedicerotidae. 



Nomenclatural Changes in Ampithoidae 



Amphitholina Ruffo (1953) is removed to Eophliantidae. 

 Amphithoides patrizii Maccagno (1936) is removed to Cymadusa. 



Key to the Genera of Ampithoidae 



1. Mandible lacking palp (fig. 6 Id) Sunamphitoe 



Mandible bearing palp (fig. 61c) 2 



2. Antenna 1 lacking accessory flagellum 3 



Antenna 1 bearing accessory flagellum 6 



3. Gnathopod 1 larger and stouter than gnathopod 2 Exampithoe 



Gnathopod 1 smaller and more slender than gnathopod 2 4 



4. Gnathopods feeble, chelate (fig. 61A;) Macropisthopus 



Gnathopods large, subchelate (figs. 61j,0 5 



5. Article 6 of pereopods 3-5 widened apically, subprehensile (fig. 6 In), often 



bearing large striated spines, telson with apical pair of reverted, elongate, 



cornified processes (fig. 6I5) Pleonexes 



Article 6 of pereopods 3-5 widened or not widened, rarely subprehensile 

 (fig. 61m), apical cornified processes of telson if present, obsolescent (fig. 

 61p) Ampithoe 



6. Outer ramus of uropod 3 bearing one hook Amphithoides 



Outer ramus of uropod 3 bearing two hooks (fig. 6I0) 7 



7. Gnathopod 1 larger than gnathopod 2 Paragrubia 



Gnathopod 1 smaller than gnathopod Cymadusa 



Genera of Ampithoidae 



Amphithoides Kossmann 



Amphithoides Kossmann, 1880. — Stebbing, 1906. 



Type-species: A. longicornis Kossmann, 1880 (monotypy). 



Antenna 1 with accessory flagellum; mandible with palp; gnatho- 

 pods large, subchelate, gnathopod 2 equal to or larger than 1 ; article 6 

 of pereopods 3-5 not apically widened; outer ramus of uropod 3 with 

 one hook. Species: 1, Red Sea, littoral. 



Ampithoe Leach 



Ampithoe Leach, 1814a. — Stebbing, 1906. 



Type-species: Cancer (Gammarus) rubricatus Montagu, 1808 

 (monotypy). See Sars, 1895. 



