KNIGHT: DEVELOPMENT OF EUPHAUSIA GIBBOIDES 



Figure 11.— Thoracic leg 5: A, furcilia IV; B, furcilia V; C, furcilia VI. Leg 6: D, furcilia V; E, furcilia VI. Leg 7: I, furcilia IV; 

 J, furcilia V; K, furcilia VI. Leg 8: F, furcilia IV; G, furcilia V: H, furcilia VI. Pleopod 1: L, furcilia I; M, furcilia II; N, furcilia III; 

 O, furcilia IV; P, furcilia VI. Uropods: Q, calyptopis III; R, furcilia I; S, furcilia II. 



more northern areas. In the sample from August 

 1963 (6306-117.80), the sizes of developmental 

 stages were similar to those found in the same 

 general area in the spring. There is insufficient 

 information at this time to consider the effects 

 of environmental conditions on the rate of larval 

 growth and development in E. gibboides, but 

 similar variation has been observed in other 



species of euphausiids (Einarsson 1945; Mauch- 

 hne 1965). 



The range and mean of carapace width in 

 calyptopis stages expressed as percent of cara- 

 pace length is given in Table 10 as the propor- 

 tional anterolateral expansion of carapace 

 appears to be a useful character for identifica- 

 tion of E. gibboides. Comparison by area shows 



163 



