GORE and SCOTTO: LARVAL DEVELOPMENT OF CYCLOGRAPSUS INTEGER 



Carapace (Fig. 2A, a).— Smooth, globose, dorsal 

 spine short, slightly curving posteriorly, rostral 

 spine stout, bluntly rounded, ventrally directed; 

 no lateral spines present in this stage. A medio- 

 dorsal knob (Fig. 2a) midway between bases of 

 dorsal and rostral spines with 5 integumental 

 sensilla arranged as illustrated, these present in 

 all stages. Posterolateral margin of carapace in- 

 distinctly and irregularly dentate; ventrolateral 

 margin produced into a blunt V-shaped process. 

 Paired setae posterolateral^ to base of dorsal 

 spine in all stages. Eyes unstalked. 



Abdomen and Telson (Fig. 2B).— Five somites; 

 first naked, second, third, and fourth with paired 

 lateral knobs (fourth smallest) directed anter- 

 iorly, ventrally, and laterally respectively, these 

 also with bluntly rounded posterolateral process; 

 fifth somite with bluntly rounded posterolateral 

 process. Pair of posterodorsal setae on somites 

 2-5 in all stages. Telson rectangular with pair of 

 short, minutely hairy, furcae, 6 spines in be- 

 tween, each armed with rows of spinules. Shal- 

 low median notch present. 



Antennule (Fig. 2C). — Conical rod directed an- 

 teriorly, flanking rostral spine, with 4 aesthe- 

 tascs of varying size. 



Antenna (Fig. 2D). — Biramous; protopodite and 

 exopodite spinelike processes approximately 

 equal in length, both armed with 2 rows of spin- 

 ules; exopodite with a simple seta one-third dis- 

 tance from base. 



Mandibles (Fig. 2E).— Asymmetrically scoop- 

 shaped process; incisor process with 1 large tooth 

 anteriorly as well as posteriorly, 3 bluntly 

 rounded denticles in between, plus 3 similarly on 

 posterior edge of right mandible, 2 on left; molar 

 process irregularly dentate, a large rounded 

 tooth on the posterior angle. 



Maxillule (Fig. 2F). — Endopodite 2-segmented, 

 setal formula progressing distally 1,5 (4 termi- 

 nal plus 1 subterminal); basal endite with 5 stout 

 setae, coxal endite with 4 stout, 1 thinner seta. 

 Additional pubescence as illustrated. 



Maxilla (Fig. 2G).— Endopodite irregularly bi- 

 lobed, each with 2 setae; basal and coxal endite 

 bilobed, setal formula proximally to distally 5,4 

 and 4,3, respectively. Scaphognathite with 4 

 plumose setae on outer margin, distal portion 



tapering to setose apical process. Other pubes- 

 cence as illustrated. 



Maxilliped 1 (Fig. 2H).— Coxopodite naked; basi- 

 podite with 9 ventral setae, progressing distally 

 2,2,3,2; endopodite 5-segmented, setal formula 

 2,2,1,2,4+1 (Roman numeral = dorsal setae), 

 third segment with several minute hairs on dor- 

 sal surface; exopodite indistinctly 2-segmented, 

 4 terminal natatory setae. 



Maxilliped 2 (Fig. 21).— Coxopodite naked; basi- 

 podite with 4 ventral setae, progressing distally 

 1,1,1,1; endopodite 3-segmented, setal formula 

 0,1,5+1; exopodite indistinctly 2-segmented, 4 

 natatory setae. 



Color. — Overall golden-brown under refracted 

 light, abdomen colored more intensely than 

 cephalothorax. Cornea black under refracted, 

 iridescent blue under reflected light. Grouped 

 brown and orange chromatophores appear as fol- 

 lows: carapace, 4 interocular, 1 at base of dorsal 

 spine, 1 at position of posterodorsal knob, 2 at 

 future position of lateral spines, 4 along posterior 

 margin, 3 at posteroventral angle; appendages, 1 

 on mandibles, 1 each on antennular and antennal 

 protopodites, 2 on each maxillipedal basipodite; 

 abdomen, 1 pair ventromedially on first somite, 

 second through fifth somites with 1 pair antero- 

 ventrally and 1 pair posteroventrally; telson with 

 1 pair anteriorly and 1 pair posteriorly at base of 

 each set of 3 spines. 



Second Zoea 



Carapace length: 0.50 mm; 5 specimens exam- 

 ined. 



Carapace (Fig. 3A).— Enlarged, pair of ventrally 

 curved lateral spines now present. Dorsal and 

 rostral spines both elongated, thinner, ends more 

 tapered than first stage. Pair of interocular and 1 

 posterolateral seta now present. Posterodorsal 

 knob midway between base of dorsal spine and 

 posterior edge of carapace more prominent. 

 Eyes stalked. 



Abdomen and Telson (Fig. 3B).— Similar in shape 

 and armature to first stage with addition of 

 single long dorsal seta on posteromedial edge of 

 first somite. 



Antennule (Fig. 3C).— As in first stage but with 6 

 unequal aesthetascs. 



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