18 ANTHURIDEA • ANTHURIDAE 



illipedal palp of three articles; endite small or absent. Pereopod 1, propodal 

 palm with step or tubercle. Pereopods 4-7, carpus triangular. Pleonites 

 short, pleonites 1-4 fused, boundaries demarked by complete dorsal folds, 

 pleonites 4 and 5 separated only by lateral fold, not demarked dorsally; 

 pleonite 6 dorsally demarked from telson. Pleopod 1 exopod operculiform. 

 Uropodal exopod often notched or excavate distally. Pleotelson with two 

 basal statocysts. 



Key to species of Amakusanthura 



1. Telson thickened, with raised area at midlength, widening and sloping 



posteroventrally; uropodal exopod distally shallowly excavate 



magnijica 



Telson dorsally flat, not thickened; uropodal exopod distinctly notched 

 or barely excavate distally 2 



2. Integument pigmented; uropodal endopod length 1.5 times basal width 



signata 



Integument not pigmented 3 



3. Uropodal exopod distinctly notched 4 



Uropodal exopod, outer margin weakly excavate; mandibular palp 



article 3 bearing three spines lathridia 



4. Mandibular palp article 3 bearing three spines significa 



Mandibular palp article 3 bearing two spines geminsula 



Amakusanthura geminsula (Kensley, 1982) 

 Figure 3A-E 



DIAGNOSIS 9 : 8.1 mm. Shallow middorsal pit on pereonites 4-6, appearing 

 chalky white in life. Antennular flagellum of three articles. Antennal 

 flagellum of two articles. Mandibular palp article 3 bearing two spines. Max- 

 illiped with short slender endite; terminal palp article set obliquely at outer 

 distal angle of penultimate article. Pereopod 1, propodal palm with step; 

 carpus distally a rounded lobe. Uropodal exopod with notch. Pleotelson 

 tapering in posterior half to subtruncate apex. S: 4.8 mm. Eyes larger than 

 9. Antennular flagellum of 8-9 articles. Pereopod 1, carpus with distal lobe 



