MARINE GAMMARIDEAN AMPHIPODA 203 



Dexamine Leach 



Dexamine Leach, 1814b. — Stebbing, 1906. 

 Amphithonotus Costa, 1851b. 



Type-species: Cancer spinosus Montagu, 1813 (monotypy). See 

 Sars, 1895. 



Lower lip with poorly developed inner lobes, mandibular processes 

 distinct; palp of maxilla 1 uniarticulate ; maxillipedal palp 3-articulate, 

 inner plates well developed ; article 4 of pereopods shorter than articles 

 5-6 combined (Tritaeta). Species: 5, boreal N. E. Atlantic, Mediter- 

 ranean, Ceylon, littoral. 



Dexaminella Schellenberg 



Dexaminella Schellenberg, 1928b. 



Type-species: D. aegyptiaca Schellenberg, 1928b (monotypy). 



Lower lip with well-developed inner lobes, mandibular processes 

 distinct; palp of maxilla 1 uniarticulate; maxillipedal palp 3-articulate, 

 inner plates absent. Species: 1, Red Sea, littoral. 



Dexaminoides Spandl 



Dexaminoides Spandl, 1923. 



Type-species: D. orientalis Spandl, 1923 (monotypy). See J. L. 

 Barnard, 1965. 



Lower lip with well-developed inner lobes, mandibular processes 

 distinct; palp of maxilla 1 uniarticulate; maxillipedal palp 4-articulate, 

 article 4 claw-like (Dexamonica) , inner plates vestigial, bud-like. 

 Species: 1, Indo-Pacific, tropical, littoral. 



Dexamonica J. L. Barnard 



Dexamonica J. L. Barnard, 1958c. 



Type-species: D. reduncans J. L. Barnard, 1958c (original 

 designation) . 



Lower lip with distinct, fused inner lobes, mandibular processes 

 obsolescent; palp of maxilla 1 uniarticulate; maxillipedal palp 4- 

 articulate, article 4 short, not claw-like (Dexaminoides), inner plates 

 vestigial, bud-like. Species: 1, California, littoral. 



Guernea Chevreux 



Heller ia Norman, 1868 (homonym, Isopoda). 



Guernea Chevreux, 1887 (new name). — Stebbing, 1906. 



Prinassus Hansen, 1887. 



Type-species: Helleria coalita Norman, 1868 (monotypy). See 

 Chevreux and Fage, 1925. 



