HAYNES: PANDALIDAE, HIPPOLYTIDAE, AND CRANGONIDAE LARVAE 



Rostrum with 7 dorsal teeth; pleopods tipped 

 with a few setae; telson margins nearly 

 parallel Stage VII 



Figure 9. -Chela of pereopod 

 2, Stage VI zoea of Pandalns 

 tridens. 



0.25 mm 



HIPPOLYTIDAE 



(Genera Eualus, Heptacarpus, Hippo lyte, 

 Lebbeus, and Spirontocaris) 



In all described stages, rostrum absent to long, 

 usually spiniform (slightly sinuate in species with 

 abbreviated development); plumose seta rather than 

 long setose spine on inner flagellum of antennule; 

 exopodites on pereopods 1-2, 1-3, or 1-4; abdomen 

 without dorsal spine or keels on somite 3 (megalopa 

 of Spirontocaris spinus with a minute dorsoposterior 

 spine on abdominal somite 3); posterolateral spines 

 absent, on abdominal somites 4 and 5, or only on 

 abdominal somite 5 (spines may be lacking in mega- 

 lopa); pereopod 1 never subchelate; anal spine pres- 

 ent in all stages (exception: at least Stage I of Hyp- 

 poly te). Rostrum may have teeth in last zoeal stage 

 (megalopa); supraorbital spine usually absent in 

 Stage I. Stages I-III, antennal scale nearly always 

 jointed or partially jointed at tip. Stage I, exopodites 

 of maxilliped 1-3 with 4, 5, 5 natatory setae; about 

 Stage V, setose setae on endopodite of each pleopod; 

 telson does not widen posteriorly, has more than 1 

 pair of lateral spines. 



The principal morphological characters and 

 number of larval stages of known larvae of hippolytid 

 shrimp of the northern North Pacific Ocean are sum- 

 marized in Table 5. 



Table 5. — Principal morphological characteristics and nunnber of larval stages of known larvae of hippolytid 

 shrimp of the northern North Pacific Ocean. + = yes; - = no; ? = unknown. 



'Undeveloped pereopods. 'Minute. 



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