168 



S. OHTSUKA, G.A. BOXSHALL AND H.S.J. ROE 



Ps 



V 



_P£_ 



TT 





M1, PI 









M2 

















/ 









/ 







V 



a or b 







"*" 









1 





Jl 



Ma 



V 



Fig. 42. Schematic comparison of patterns of segmentation and setation of female fifth legs in some arietellids. The arrows indicate possible 

 derivations of setation and segmentation patterns and are not indicative of ancestor-descendant relationships between taxa. Ap: Arietellus 

 pavoninus; As: A. sp.; Am: A. mohri; Ps: Paraugaptilus similis; Sa: Sarsarietellus abyssalis; Pj: Paramisophria japonica; Pi: P. itoi; Pp: P. 

 platysoma; Pg: P. giselae; Pr: P. reducta; Ch: Crassarietellus huysi; Ml: Metacalanus species 1; M2: M. species 2; Ma: M. acutioperculum; 

 PI: Pilarella longicornis. C: Coxa; B (in Ch): Basis; Is: Intercoxal sclerite; Ex: Exopod; En: Endopod. A-D (in Sa): setae on endopod; a-f: 

 spines on exopod. 



third exopod segment of the right leg is 3 in Campaneria, 2 in 

 Paraugaptiloides , Arietellus and Paraugaptilus, and 1 in Meta- 

 calanus; on the left leg it is 3 in Campaneria and Arietellus 

 and 1 in Metacalanus. The distal two exopodal segments are 

 separate in both legs in Paraugaptiloides , Paramisophria and 

 Metacalanus, and fused in both legs of Campaneria and 



Paraugaptilus and in the right leg only in Arietellus. The distal 

 two segments of the right leg are missing in the only known 

 male of Crassarietellus sp. The terminal and subterminal 

 elements on the third exopodal segment of the left leg are 

 heavily chitinized and almost fused to the segment only in 

 Paraugaptiloides, Arietellus and Paraugaptilus. 



