MARINE GAMMARIDEAN AMPHIPODA 451 



Type-species: S. validus Dana, 1853 (selected by monotypy of 

 Dana, 1853). See Chevreux and Fage, 1925. 



Mandibular palp absent; palp of maxilla 1 biarticulate; article 2 

 of pereopods 4-5 expanded; accessory fiagellum absent (Microstenothoe) . 

 Species: 32, cosmopolitan, littoral to bathyal. 



Stenothoides Chevreux 



Stenothoides Chevreux, 1900.J— J. L. Barnard, 1962c. 

 Mesostenothoides Gurjanova, 1938. 



Type-species: S. perrieri Chevreux, 1900 (monotypy). 



Mandibular palp 1-articulate or absent; palp of maxilla 1 uni- 

 articulate; article 2 of pereopod 4 linear, of article 5 expanded. Spe- 

 cies: 6, subarctic-boreal, littoral. 



Stenula J. L. Barnard 



Stenula J. L. Barnard, 1962c. 



Type-species: Stenothoides latipes Chevreux and Fage, 1925 (ori- 

 ginal designation). 



Mandibular palp 1-articulate; palp of maxilla 1 uniarticulate; 

 article 2 of pereopods 4-5 expanded. Species: 10, arctic-boreal, 

 littoral to bathyal. 



Stilipedidae 



Figures 163, 164, frontispiece 



Diagnosis. — Accessory fiagellum absent or vestigial, less than 

 3-articulate; mandible broad and lacking molar; maxillae foliaceous 

 (figs. 163c, f/); gnathopods simple but not especially slender. See 

 Pardaliscidae Hyi)eriopsidae, Laphystiopsidae, Astyridae. 



Description. — Peduncles of antennae very short, accessory fiagel- 

 lum vestigial or absent; upper lip asymmetrically bilobed; mandible 

 very broad, pardaliscid in appearance, palp 3-articulate, thin, lacking- 

 molar; lower lips variable; maxilla 1 variable, some parts always 

 foliaceous; maxilla 2 foliaceous; plates of maxilliped large, palp 

 variable in length; gnathopods simple but not especially slender; 

 coxae long; uropod 3 biramous, peduncle short, rami elongate, 

 lanceolate; telson apically emarginate, short. 



Relationship. — Differing from the Acanthonotozomatidae by the 

 foliaceous maxillae (except Maxilliphimedia in that family) and the 

 mouth])arts not being arranged in a conical bundle. 



The Astyridae differ from the Stilipedidae by the weaker foli- 

 aceousness of the first maxilla but intergradation occurs in the genus 



