O ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



Key TO THE Western Atlantic Genera of 

 Crustacea Stomatopoda 



1. Ischiomeral articulation of raptorial claw terminal; merus of rap- 

 torial claw grooved inferiorly throughout its length for the recep- 

 tion of the propodus ; dactylus not inflated at base .... 2 

 Ischiomeral articulation of raptorial claw not terminal, situated 

 anterior to proximal end of merus; merus grooved for not more 

 than three-fourths of its length for reception of propodus; dac- 

 tylus inflated at base 6 



2. Carapace usually with well-marked carinae; first five abdominal 



somites with longitudinal carinae 3 



Carapace without carinae; first five longitudinal somites without 

 carinae 4 



3. Basal prolongation of uropod with three spines, the outer much 

 the longest ; at most two intermediate denticles on telson ; rap- 

 torial dactylus armed with three teeth . . Parasquilla, n. gen. 

 Basal prolongation of uropod with two spines, the inner much the 

 longer ; more than three intermediate denticles on telson ; rap- j 

 torial dactylus armed with four or more teeth . . . .Squilla 



4. Abdomen depressed, noticeably flattened ; telson without definite I 

 median carina; submedian teeth of telson, if movable, arising 

 from submarginal (ventral) surface .... Lysiosquilla j 

 Abdomen compressed, rarely noticeably flattened; telson with ' 

 well-marked median carina and additional longitudinal carinae on 



its dorsal surface; submedian marginal teeth of telson with mov- 

 able tips 5 



5. Raptorial dactylus armed on its inner margin, usually with three 



or four teeth Pseudosquilla 



Raptorial dactylus armed only with terminal tooth 

 [Hemisquilla] 



6. Raptorial dactylus unarmed except for terminal tooth 



Gonodactylus 



Raptorial dactylus armed with six or more teeth .... 

 [Odontodactylus} 



