FISHERY BULLETIN: VOL. 82, NO. 2 



Although food was seen in the guts of some 

 Placetron wosnessenskii zoeae, none molted to 

 Stage II. Zoeae of Rhinolithodes wosnessenskii fed 

 actively and molted to Stage II about 20 d after 

 hatching. Failure to change the seawater on 

 schedule prevented rearing the zoeae of R. wos- 

 nessenskii beyond Stage II. 



DESCRIPTION OF ZOEAE 



Terminology, methods of measuring zoeae and 



their appendages, techniques of illustration, and 

 nomenclature of appendages follow Haynes ( 1979). 

 Carapace length refers to the straight-line dis- 

 tance from posterior margin of eye orbit to mid- 

 dorsal posterior margin of carapace, excluding the 

 middorsal spine. Spines on the telson are num- 

 bered from the outermost to innermost (medial) 

 pair. Setation formulae are the number of setae 

 per segment from the distal segment to the proxi- 

 mal segment. For clarity in the illustrations, 

 setules on plumose setae are usually omitted, but 



0. 5 mm 



FIGURE l.— Stage I zoea of Placetron wosnessenskii: A, whole animal, right side; B, carapace, dorsal; C, antennule, ventral; 

 D, antenna, ventral; E, mandibles (left and right), posterior; F, maxillule, ventral; G, maxilla, dorsal; H, first maxilliped, lateral; 



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