182 FLABELLIFERA • CYMOTHOIDAE 



Cymothoa Fabricius, 1793 



DIAGNOSIS Body usually not distorted. Cephalon with posterior margin not 

 trilobed; more or less immersed in pereonite 1 ; latter with anterolateral cor- 

 ners produced to embrace cephalon. Bases of antennules not expanded, well 

 separated. Anterior coxal plates not reaching posterior borders of their re- 

 spective pereonites, posterior coxal plates nearly reaching or extending be- 

 yond posterior borders of pereonites. Pleon narrower than, and immersed in 

 pereonite 7. Pleonites increasing in length and width posteriorly. 



Key to species of Cymothoa 



1 . Anterolateral angles of pereonite 1 reaching to half length of cephalon 



or less; eyes or traces of eyes present 2 



Anterolateral angles of pereonite 1 broad, reaching to anterior margin 

 of cephalon; eyes absent oestrum 



2. Anterolateral angles of pereonite 1 narrow, subacute excisa 



Anterolateral angles of pereonite 1 broad, rounded caraibica 



Cymothoa caraibica Bovallius, 1885 

 Figure 82B 



DIAGNOSIS 9 17 mm, S 12-16 mm. Anterior margin of cephalon broadly 

 rounded. Eyes large, distinct. Broadly rounded anterolateral angles of per- 

 eonite 1 reaching to about midlength of cephalon. Bases of pereopods 4-7 

 with strong, rounded carina. Uropodal rami subequal in length, equal to 

 peduncle in length. Pleotelson width about twice length, posterolateral mar- 

 gin broadly rounded. 



RECORDS Puerto Rico; Gulf of Mexico. 



Cymothoa excisa Perty, 1833 

 Figure 82C 



DIAGNOSIS Ovigerous 9 20-24 mm. Anterior margin of cephalon in dorsal 

 view truncate to slightly excavate; eyes small, indistinct. Anterolateral angles 

 of pereonite 1 narrowly rounded to subacute, reaching anteriorly to about 

 midlength of cephalon. Pereopods 4-7 with high rounded carina on basis. 



