210 FLABELLIFERA • SPHAEROMATIDAE 



Paraleptosphaeroma glynni Buss and Iverson, 1981 

 Figure 92F 



DIAGNOSIS 6 2.58 mm, ovigerous 9 2.38 mm. Pleotelson basally broad, 

 tapering to notched posterior margin. Fused uropodal endopod and sympod 

 of each side almost touching posterior to pleotelsonic apex. 



RECORDS Portsmouth, Dominica, intertidal rock pools. 

 Punta Paitilla, Pacific Panama. 



REMARKS Buss and Iverson (1981) demonstrated that this species displays 

 sequential protogynous hermaphroditism, and that the change from female 

 to male seems to be mediated by social conditions, especially the proportion 

 of males to females. The principal food source for this species was shown to 

 be abascan bryozoans. 



Key to genera of Dynameninae 



1. Pleotelson very similar in both sexes 2 



Pleotelson showing marked sexual dimorphism 3 



2. Cephalon and pleotelson smooth, lacking ridges Ischyromene 



Pleotelson and cephalon with ridges Cerceis 



3. Uropods lamellar in both sexes 4 



Uropods lamellar in 9 , endopod reduced, exopod elongate-cylindrical 



in 6 5 



4. Ovigerous 9 lacking oostegites; 6 , pleopod 2 copulatory stylet basally 



broad, distally tapering, extending to or beyond ramus . . Dynamenella 

 Ovigerous 9 with one pair of oostegites on pereonite 4; S , pleopod 2 

 copulatory stylet narrow, extending well beyond ramus .... Paradella 



5. S , strong median lobe in pleotelsonic notch reaching well beyond 



margin; ovigerous 9 with three pairs of oostegites Discerceis 



S, pleotelsonic notch with short median lobe, if present; ovigerous 9 

 with three or four pairs of oostegites 6 



6. Ovigerous 9 with three pairs of oostegites; S pleotelsonic notch 



lacking marginal teeth or median lobe Geocerceis 



Ovigerous 9 with four pairs of oostegites; <5 pleotelsonic notch with 

 marginal teeth and/or median lobe Paracerceis 



