208 FLABELLIFERA • SPHAEROMATIDAE 



well developed, fused with sympod; exopod markedly reduced. Penial rami 

 elongate, separate. 9 mouthparts not metamorphosed. Oostegites absent. 

 Brood housed in pouch formed by opposing pockets overhanging ventrum, 

 opening by slit between fourth pereopods. 



Key to species of Cassidinidea 



1 . Posterior margin of pleotelson truncate ovalis 



Posterior margin of pleotelson rounded mosaica 



Cassidinidea mosaica Kensley and Schotte, 1987 

 Figure 92A 



DIAGNOSIS 6 1.8 mm, ovigerous $ 1.6 mm. Body twice longer than wide. 

 Dorsal integument bearing close-packed flattened tubercles. Pleotelson tri- 

 angular, with posterior margin narrowly rounded, dorsally convex, basally 

 inflated. 



RECORDS Carrie Bow Cay, Belize, 1.5—10 m; in silty sand and rubble be- 

 tween patch reefs and coral buttresses. 



Cassidinidea ovalis (Say, 1818) 

 Figure 92B-E 



DIAGNOSIS 6 and 9 3.6 mm. Body width slightly less than half length. 

 Dorsal integument smooth. Pleotelson with raised anteromesial area, but 

 lacking sculpture; posterior margin truncate. 



RECORDS New Jersey to Florida, in marsh mud and among dead leaves, 0— 

 1 m; Trinidad; Belize; Panama; Dominica; Louisiana and Vera Cruz, Gulf of 

 Mexico. Known from waters of less than l%o to 35%o. 



Paraleptosphaeroma Buss and Iverson, 1981 



DIAGNOSIS Body oval in outline, entire circumference with transparent 

 flange of fused setae on two expanded basal articles of antennule, on per- 

 eonites, pleonite 1, and uropods. Expanded basal articles of antennules con- 



