Dynamenella 213 



Discerceis linguicauda (Richardson, 1901) 

 Figure 93B 



DIAGNOSIS S 7.2 mm. Dorsal integument, especially of posterior half, with 

 numerous scattered granular tubercles. Uropodal endopod and sympod 

 fused, very short, exopod elongate, subcylindrical and slightly bowed. Ante- 

 rior half of pleotelson inflated, with three elongate rounded ridges (each com- 

 posed of two contiguous tubercles) ending posteriorly in subacute tubercle; 

 posterior margin trilobed, median lobe broadly rounded, with subacute tu- 

 bercle at base, lateral lobe truncate, well separated from median lobe. Head 

 and pereonite 1 not fused. Frontal lamina visible dorsally between antennal 

 bases. Penes short, separate. Copulatory stylet basally relatively broad, dis- 

 tally broadly rounded. 



RECORDS Cape Catoche, Yucatan, Mexico, 48-50 m. 



REMARKS This specics is known only from the four male syntypes. 



Dynamenella Hansen, 1905b 



DIAGNOSIS Species exhibiting obvious sexual dimorphism. Both sexes lack- 

 ing processes on pereon and pleon. Uropodal rami lamellar. Exopod of 

 pleopod 3 with or without articulation. 9 : Mouthparts not metamorphosed. 

 Broodpouch lacking oostegites, but formed by two opposing ventral pockets 

 opening in midline between fourth pereopods. Apex of pleotelson with notch, 



Key to species of Dynamenella 



1 . S with pleotelsonic foramen 2 



6 lacking foramen but with notch, or appearing entire; 9 pleotelson 



with faint notch visible acutitelson 



2. 6 with four strong pleotelsonic ridges; 9 with subcircular pleotelsonic 



foramen quadrilirata 



S lacking pleotelsonic ridges; 9 with posterior margin of pleotelson 

 entire perforata 



