Apanthura cracenta 25 



Apanthura Stebbing, 1900 



DIAGNOSIS Integument sometimes pigmented. Eyes present. 9: Antennu- 

 lar flagellum of three articles. Antennal flagellum of two to four articles. 

 Mandibular palp of three articles, terminal article bearing distal spines. 

 Maxillipedal palp of three articles; endite small, or lacking. Pereopod 1, pro- 

 podal palm usually with step or tubercle; propodus inflated. Pereopods 4-7, 

 carpus triangular. Pleonites 1—5 fused; pleonite 6 dorsally demarked. 

 Pleopod 1 , exopod operculiform. Uropodal exopod ovate, sometimes distally 

 notched or excavate. Pleotelson with two basal statocysts. 6 antennular 

 flagellum of about 10 articles. 



REMARKS Differentiation of species, especially if long preserved and the 

 pigmentation is lost, depends on subtle features of the mandible, maxilliped, 

 pereopods, and pleotelson. 



Key to species of Apanthura 



1. Uropodal exopod distally notched or excavate 2 



Uropodal exopod distally entire; uropodal endopod length subequal to 



width crucis 



2. Uropodal exopod distally notched; uropodal endopod length 2.4 times 



basal width cracenta 



Uropodal exopod faintly excavate or sinuate; uropodal endopod length 

 about twice basal width harringtoniensis 



Apanthura cracenta Kensley, 1984 

 Figure 7B-E 



DIAGNOSIS 9 : 4.6 mm. Antennular flagellum of three articles. Antennal 

 flagellum of two articles. Mandibular palp article 3 bearing four spines. 

 Maxilliped with short rounded endite; terminal palp article set at oblique 

 angle on, and less than half length of penultimate article. Pereopod 1, carpus 

 triangular with acute sclerotized tip overlapping base of palm; propodal 

 palm with rounded tubercle near midlength. Uropodal exopod deeply 

 notched; endopod ovate, length 2'/3 basal length. Pleotelson lanceolate. 6: 

 3.8 mm. Antennular flagellum of six articles. Antennal flagellum of two arti- 

 cles. Pleopod 2, copulatory stylet of endopod reaching by half its length be- 

 yond ramus. 



