CAPRELLIDAE OF WESTERN NORTH ATLANTIC 



17 



22 



20 



'^18 



^ 16 



Os 



«o 



^ 



7-i 

 12 

 10 



8 



6 



2\ 



II 



III 



IV / V /vy./ 



VII 



I I I ' ^ ^/ 



• - Male 



* - Female 



a 4 tl 8 10 12 U 10 IS 2U 22 2Jt 28 28 St) 



Cumulative 'pereonite length (mm) 



Figure 6. — Aeginina longicornis, cumulative pereonite length plotted against total length. 

 Roman numerals indicate pereonites; I includes both pereonite 1 and cephalon. Solid 

 horizontal lines represent individuals. 



males was collected during August and September and the breeding 

 season appears to extend from April to December. No ovigerous 

 females were i)resont in samples taken from January to March. 

 Whether this is due to the fact that the caprellids do not breed during 

 this period or simply that adequate samples were not taken, is not 

 known. 



Tlie varieties of this species which are found along the east coast 

 of North America do not ap])ear to be geographically or bathymetri- 

 cally isolated from each other and so they probably do not represent 

 subspecies. These varieties may represent the phenotypic expression 

 of different degrees of spination influenced by such parameters as 

 substrate, breeding season, or diet; however, such data are not 

 available to me. 



