HAYNES: PANDALIDAE, HIPPOLYTIDAE, ANDCRANGONIDAE LARVAE 



megalopa. (For shrimp, the change from larva to 

 adult is usually somewhat gradual and may include 

 more than one molt.) 



megalopa- larva with fully setose natatory pleopods^ 

 on some or all abdominal somites. 



setation formula of telson- setae or spines along the 

 terminal margin of the telson are numbered begin- 

 ning at the middle of the telson. Thus, 7 + 7 means 



^In the Decapoda. the development of setose pleopods does not 

 always provide a convenient and clear distinction between zoeal and 

 postzoeal stages. Several species of Pandalidae metamorphose 

 gradually into the postzoeal stage (see Haynes 1976). The term 

 "megalopa", therefore, may include a single stage or several stages 

 depending upon the species. In this paper, the number of larval 

 stages includes all stages before the juvenile stage, regardless of 

 whether the megalopa has one or more stages. 



that the telson has seven pairs of setae along the 



terminal margin. The first pair is the medial pair, 

 setose - having setae (bristles), 

 spine -a sharp, pointed projection, usually long and 



narrow, 

 spinose-with many spines, 

 spiniform - shaped like a spine, 

 spinule - small spine, 

 spinulose - with small spines, 

 stage - intermolt. 

 subchelate - the dactylopodite (finger) folds against 



the preceding segment (propodite), as in the first 



pereopod of crangonid adults, 

 length -total body length: distance (mm) from the 



anterior tip of the rostrum to the posterior tip of 



0.5 mm 



0. 5 mm 



Figure l.-Contmued-{M) P^, pereopod 4. (N) Pleopod; ai, appendix interna; en, endopodite; ex, exopodite. (0) 

 Tail fan; al, anal spine; en, endopodite; ex, exopodite; ts, telsonic spines. 



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