MARm^B GAMMARIDEAN AMPHIPODA 471 



Orchestoidea Nicolet 



Orchestoidea Nicolet, 1849. — Stebbing, 1906. 

 Talitronus Dana, 1850, 1852a. 

 Megalorchestia Brandt, 1851b. 



Type-species: 0. tuberculata Nicolet, 1849 (monotypy). 



Maxilla 1 with small 2-articiilate palp; palp article 4 of maxilliped 

 a vestigial bud or absent; male gnatliopod 1 subchelate but often 

 poorly, gnathopod 2 larger than 1, subchelate, article 5 not produced 

 between articles 4 and 6, female gnathopod 1 simple, gnathopod 2 

 mitten-like; uropod 3 lacking inner ramus; telson entire. Species: 

 12, primarily E. Pacific, terrestrial (beachhoppers). 



Parallorchestes Shoemaker 



Parallorchestes Shoemaker, 1941a. 



Type-species: Allorchestes ochotensis Brandt, 1851c (original desig- 

 nation). See J. L. Barnard, 1962c. 



Maxilla 1 with large 2-articulate palp; palp article 4 of maxilliped 

 unguiform; gnathopods subchelate, male gnathopod 2 much larger 

 than 1, article 5 produced between articles 4 and 6, female gnathopod 

 2 like 1; uropod 3 with small scale-like inner ramus; telson cleft. 

 Species: 1, boreal N. Pacific, littoral. 



Par hy ale Stebbing 



Parhyale Stebbing, 1897; 1906. 

 Hyaloides Schellenberg, 1939. 



Type-species: P. fasciger Stebbing, 1897 (monotypy). See Shoe- 

 maker, 1956b. 



Maxilla 1 with 1-articulate palp; article 4 of maxillipedal palp 

 unguiform; gnathopods subchelate, male gnathopod 2 larger than 1, 

 article 5 produced between articles 4 and 6, female gnathopod 2 like 

 gnathopod 1 and slightly larger; uropod 3 with small scale-like inner 

 ramus; telson cleft. Species: 2, circumtropical, littoral. 



Parhyalella Kunkel 



Parhyalella Kunkel, 1910.— Schellenberg, 1938. 

 Exhyalella Stebbing, 1917. 



Type-species: P. batesoni Kunkel, 1910 (monotypy). 

 Maxilla 1 lacking palp; article 4 of maxillipedal palp unguiform; 

 gnathopods subchelate, male gnathopod 2 larger than 1, article 1 

 produced between articles 4 and 6, female gnathopod 2 like male but 

 smaller; uropod 3 uniramous; telson entire. Species: 7, pantropical, 

 freshwater and marine. 



