GORE and SCOTTO: LARVAL DEVELOPMENT OF CYCLOGRAPSUS INTEGER 



Abdomen and Telson (Fig. 5B).— Pleopod and 

 uropod buds now present on somites 2-5 and 6, 

 respectively. First somite now with 5 middorsal 

 setae. 



Antennule (Fig. 5C).— Conical rod with 5 termi- 

 nal plus 2 subterminal aesthetascs. 



Antenna (Fig. 5D). — Armature and form similar 

 to previous stage. Endopodal bud now present, 

 less than one-half length of protopodal process. 



Mandible (Fig. 5E).— Similar to third stage with 

 addition of 1 bluntly rounded tooth on posterior 

 edge of incisor process. 



Maxillule (Fig. 5F).— Endopodite setation un- 

 changed, basal endite now with 11 or 12 setae, 

 coxal endite with 8 setae, 3-5 plumose setae on 

 basal margin, placed as illustrated. 



Maxilla (Fig. 5G).— Setal formulae on endopo- 

 dite 2,2; basal endites 6,5; coxal endites 7,3. 

 Scaphognathite with 17-21 thinner setae, plus 5 

 or 6 stouter distal setae. 



Maxilliped 1 (Fig. 5H).— Coxopodite now with 2 

 ventral setae. Basipodite setation unchanged. 

 Endopodite now with 2,2,1 plus 1 spine, 2,5+1. 

 Exopodal natatory setae 9. 



Maxilliped 2 (Fig. 51).— Coxo-, basi-, and endo- 

 podal setation unchanged. Exopodite now with 9 

 natatory setae. 



Color.— Ocherous orange; additional orange and 

 brown chromatophores appear together as fol- 

 lows: 1 each posterior to eyestalks, 1 anteromedi- 

 ally on somites 2-4, a pair anteroventrally on 

 somites 5 and 6, 1 anteroventral plus another 

 medioventral pair on telson, and 1 each at base of 

 lateral spine. 



Fifth Zoea (Ultimate) 



Carapace length: 1.2 mm; 3 specimens exam- 

 ined. 



Carapace (Fig. 6A).— Similar to previous stage, 

 dorsal spine elongate, posterodorsal border with 

 4 setae, posterolateral margin with 8 setae. 



Abdomen and Telson (Fig. 6B).— First somite 

 with 6 or 7 middorsal setae, all other morphologi- 



cal features similar to fourth stage. Pleopod buds 

 elongate, all now with endopodites. 



Antennule (Fig. 6E).— Endopodal bud present 

 laterally below 2 tiers of aesthetascs, 5 unequal 

 terminal aesthetascs plus 1 seta, and 6subtermi- 

 nal aesthetascs. Basal region swollen, unseg- 

 mented. 



Antenna (Fig. 6F).— Endopodal bud now three- 

 fourths length of protopodal process. Exopodal 

 spine remains shorter than protopodite. 



Mandible (Fig. 61).— Palp bud present on anter- 

 ior surface. Incisor and molar form and arma- 

 ture as in fourth stage. 



Maxillule (Fig. 6J).— Endopodal setation un- 

 changed. Basal endite with 15 or 16 setae, coxal 

 endite with 10-13 setae, 3 additionally on basal 

 margin. 



Maxilla (Fig. 6K).— Endopodite unchanged. 

 Setae of basal endites 8,8, coxal endites 11,4. 

 Scaphognathite with 31-33 marginal setae. 



Maxilliped 1 (Fig. 6L).— Coxopodite now with 3 

 ventral setae. Basi- and endopodite setation un- 

 changed. Exopodite now with 11 natatory setae. 



Maxilliped 2 (Fig. 6M).— Coxo-, basi-, and endo- 

 podal setation unchanged. Exopodite now with 

 12 natatory setae. 



Maxilliped 3 (Fig. 6N).— Rudimentary trilobed, 

 unsegmented naked process. 



Color. — Similar to previous stage. Numerous 

 additional brown and orange chromatophores 

 appear especially on anterior region of cephalo- 

 thorax and sixth abdominal somite and telson. 

 Tips of maxillipedal exopodites now with orange 

 hue. On day before metamorphosis to megalopa, 

 ultimate fifth stage zoea has very dark brown 

 cephalothorax with innumerable spidery brown 

 and orange chromatophores interspersed. Dor- 

 sal spine and abdomen vermilion. Coalesced 

 orange and brown chromatophore occur poster- 

 iorly on the eyestalk. 



Fifth Zoea (Penultimate) 



Carapace length: 

 ined. 



1.1 mm; 3 specimens exam- 



511 



