I 70 FLABELLIFERA • CYMOTHOIDAE 



Key to genera of Cymothoidae 



1. Antennule broader and usually longer than antenna; ccphalon very 



weakly sunk into pereonite 1 2 



Antennule not broader or longer than antenna; cephalon distinctly 

 immersed in, or not at all immersed in pereonite 1 4 



2. Bases of antennules widely separated 3 



Bases of antennules contiguous Glossobius 



3. Body curved to one side; pleonite 1 extended laterally more on one side 



than on other Mothocya 



Body rarely curved to one side; pleonite 1 extended equally on each 

 side Renodla 



4. Pereonites and coxal plates 4-7 strongly expanded on one side only 



Agama 



No pereonites or coxal plates strongly expanded 5 



5. Cephalon not immersed in pereonite 1; posterior margin of cephalon 



trisinuate 6 



Cephalon to some degree immersed in pereonite 1; posterior margin of 

 cephalon not trisinuate 7 



6. Posterolateral angles of pereonites 2-6 not produced; coxal plates short, 



rarely reaching posterior margin of their pereonites Anilocra 



Posterolateral angles of pereonites 2—6 posteriorly increasingly 



produced; coxal plates usually reaching to posterior margin of their 

 pereonites Nerocila 



7. Basal antennular articles expanded and contiguous Ceratothoa 



Basal antennular articles expanded but not contiguous, or basal 



antennular articles neither expanded nor contiguous 8 



8. Basal antennular articles expanded but not contiguous Kuna 



Basal antennular articles neither expanded nor contiguous 9 



9. Pleonal margins continuous with pereonal margins, pleon not abruptly 



narrowed, only weakly immersed in pereonite 7 Lironeca 



Pleon to some degree narrower than pereon; pleon usually deeply 



immersed in pereonite 7 Cymothoa 



