Exosphaeroma yucatanum 2 3 1 



terior area; posterior margin subtruncate to very faintly emarginate. Uropo- 

 dal exopod distally crenulate, length slightly more than twice greatest width; 

 endopod with faint distal notch. 



RECORDS Montego Bay, Jamaica. 



REMARKS The single ovigerous female holotype is the only known specimen 

 of this species. The overlapping oostegites suggest that this may not be an 

 Exosphaeroma. 



Exosphaeroma diminuta Menzies and Frankenberg, 1966 

 Figure lOOG-I 



DIAGNOSIS 6 2.2 mm. Frontal lamina widest at midlength, anteriorly 

 truncate-rounded. Pleotelson with posterior margin broadly rounded. 

 Uropodal rami not quite reaching pleotelsonic apex; exopod margin distally 

 crenulate. 



RECORDS Chesapeake Bay to Florida; Venezuela; sand dwelling, intertidal 

 and shallow subtidal. 



Exosphaeroma produdatelson Menzies and Glynn, 1968 

 Figure lOOJ-L 



DIAGNOSIS S 2.5 mm, 9 1.5 mm. Sexes essentially similar. Frontal lamina 

 widest at midlength, where slight shoulder apparent, anteriorly broadly 

 rounded, 1.6 times longer than wide. Pleotelson unornamented, anteriorly 

 inflated, posterior margin entire, evenly convex. Uropodal exopod distally 

 shallowly serrate, almost four times longer than wide; endopod wider than 

 exopod. Broad lateral patches of pigment on pleotelson in both sexes. 



RECORDS Puerto Rico, intertidal to 0.5 m, in algae on rocks; Texas, Gulf of 

 Mexico. 



Exosphaeroma yucatanum (Richardson, 1901) 

 Figure lOOM 



DIAGNOSIS Frontal lamina anteriorly tapering from widest point to sub- 

 acute apex, proximally narrower than at midlength. Pleotelson posteriorly 

 obscurely trilobed, median lobe narrowly rounded, longest; three low 

 rounded tubercles on pleotelson in anterior region. 



