214 FLABELLIFERA • SPHAEROMATIDAE 



groove, or foramen. 6: Penes basally fused, rami long, tapering. Copulatory 

 stylet proximally broad, tapering to acute tip, reaching to or just beyond 

 apex of endopod. Uropods broader than in 9. Posterior pleotelson with dor- 

 sally directed foramen connected to apex by narrow slit. 



REMARKS The species described by Richardson ( 1901 ) as Dynamene angulata 

 from No Name Key, Florida, and referred to by some authors as a Dyna- 

 menella, while figured here (Figure 93E), is not included in the present key. 

 The species is known only from immature females; correct generic placement 

 is thus not possible. 



Dynamenella acutitelson Menzies and Glynn, 1968 

 Figure 93C,D 



DIAGNOSIS S 3.5 mm, 9 2.3 mm. 6: Pereonites 4-6 with transverse ridge 

 over dorsum, ridge interrupted to form short median section. Pleotelson with 

 two submedian and two lateral rounded tubercles basally, two submedian, 

 poorly defined ridges in central area; posterior margin tapering in dorsal 

 view, with slit either just visible or appearing entire. In lateral view, posterior 

 pleotelson seen to be laterally compressed, forming narrow groove. 



RECORDS Puerto Rico, intertidal rocks and algae. 



REMARKS Menzies and Glynn (1968) described this species with two vari- 

 eties, the holotype as D. acutitelson var. typica, and 1 1 paratypes as D. acu- 

 titelson var. glabrothorax. The major difference between these varieties lay in 

 the presence of transverse ridges on pereonites 4—6 in typica and their absence 

 m glabrothorax. The holotype, however, at 3.5 mm, would seem to be a mature 

 male, while all the paratypes are smaller. The differences described by Men- 

 zies and Glynn (1968) may thus be due to immaturity. As further compara- 

 tive material is lacking, these varieties (or whatever their true status) are not 

 recognized here. 



Menzies and Glynn (1968, fig. 30a) illustrate D. acutitelson var. glabrothorax 

 as having scattered tiny granules over the dorsal integument. These were not 

 seen when the type material was reexamined. 



Harrison and Holdich (1982) placed this species in Paradella, based on the 

 literature. However, the penes for both varieties are shown as short and sepa- 

 rate, as in Ischyromene. Again, until further mature males and ovigerous 

 females are seen, the generic placement of this species must remain in doubt. 



