223 



Pereopods V are only slightly longer than pereopods III or FV; the 2nd 

 segment is longer than all the subsequent segments together, its anterior 

 margin is smooth except for three denticles on the distal process of the 

 anterior distal angle, the posterior margin is denticulate in the distal part 

 along its 2/3 length, and the distal process is unusally long, roughly four 

 times longer than the 3rd segment; the 4th and 5th segments are strong, 

 almost equal in length; the 6th segment, curved in the proximal part, is 2/3 

 the length of the 5th segment: the claw is very small, ovate. Pereopods VI 

 are the same length as pereopods V; the 4th and 6th segments are equal in 

 length, the 5th very slightly shorter than each; the claw is short and strongly 

 curved. Pereopods VII fall short of 1/2 the length of pereopods VI; the 4th 

 and 6th segments are equal in length while the 5th segment is slightly 

 shorter; the claw is short and strongly curved. 



Uropods I are broad, the basipodite shorter than the endopodite. 

 Contrarily, uropods II are very thin and much shorter than upropods I, 

 and the endopodite is much longer than the basipodite. The exopodites of 

 186 uropods I and II are small and spinelike. The endopodite of uropods III 

 is slightly longer than the basipodite and strongly denticulate on the inner 

 margin. The telson is short and triangular. 



Distribution: Mediterranean western of Sardinia. This species absent 

 in our collections. 



2. Genus Ctenoscina Wagler, 1926 



Wagler, 1926: 430; Vinogradov, 1957: 218; Bowman and Gruner, 

 1973: 14. 



Somites I and II of the pereon are not fused; a dorsal keel runs along 

 the pereon and pleon and on the posterior margin of at least the last five 

 somites of the pereon and all the somites of the pleon, merges with 

 strong denticles; similar denticles are present on the 1st segment of the 

 urosome. The eyes are well noticeable. Antennae II may be reduced to an 

 acute spine not only in the female, but also in the male. Maxillae II have 

 separated lobes. The maxillipeds lack an inner lobe. The coxal plates 

 are free. Pereopods I have weakly developed chelae; the 2nd segment 

 of pereopods V has several large denticle-lobes on the posterior margin; 

 pereopods III-VII have retractile claws. Pereopods VII are longer than 

 pereopods VI but shorter than pereopods V. The telson is free. The gills 

 are located on somites IV-VI of the pereon. 



Type species: Ctenoscina tenuis Wagler, 1926. 



KEY TO SPECIES OF GENUS CTENOSCINA 



1 . All pereon somites with dorsal denticles. Anterior distal angle of 2nd 

 segment of pereopods V produced into long, curved, slender simple 

 or broad festooned process 2. 



