252 VALVIFERA • ARCTURIDAE 



REMARKS Of the six families in the suborder, only two have been recorded 

 in the Caribbean area, the Idoteidae and the Arcturidae. 



Family Arcturidae Sars, 1897 



DIAGNOSIS Pereonite 1 either distinct, or completely or imcompletely fused 

 with cephalon. Anterior four pairs of pereopods directed anteriorly, usually 

 strongly setose; posterior three pairs of pereopods ambulatory, used for cling- 

 ing to substrate. Body often bent between pereonites 4 and 5. Uropods usu- 

 ally biramous, with minute endopod concealed by larger exopod. Pleonites 

 variously fused with pleotelson. Sexual dimorphism often marked. 



REMARKS Menzies and Kruczynski (1983) described three species of 

 arcturids from the west coast of Florida, in depths of 55-73 m: Arcturella 

 spinata, Arcturella bispinata, and Edwinjoycea horologium. These species are not 

 covered here. 



Key to genera of Arcturidae 



1. Pereonite 1 not fused with cephalon; at least one free pleonite 



Thermarcturus 



Pereonite 1 fused with cephalon; pleonites fused with pleotelson 



Astacilla 



Astacilla Cordiner, 1793 



DIAGNOSIS Antennae at least half length of body. Pereopod 1 with strong 

 terminal claw on dactylus. Pereopods 2-4 lacking dactyli. Endopod of 



Key to species of Astacilla 



1. Body integument lacking ornamentation cymodocea 



Body integument with spines or tubercles 2 



2. Pereonite 4 in d and 9 with strong middorsal tubercle; pairs of spines 



lacking on pereonites regina 



Pereonite 4 lacking strong middorsal tubercle; pairs of spines on all 

 pereonites lasallae 



