JOHNS and LANG: LARVAL DEVELOPMENT OF L1R1N1A EMARGINATA 



natatory setae. Endopodite 2-segmented; terminal 

 segment with 4 setae (2 plumodenticulate and 2 

 simple). Basiopodite with 3 setae. 



Zoea II 



Size and weight — Average carapace length. 

 0.94 mm (range 0.89-0.98 mm), average total 

 length 2.69 mm (range 2.56-2.82 mm). Average 

 dry weight, 0.0654 mg (range 0.0613-0.0712 mg). 



Carapace (Figure ID) same as for stage I. Dorsal 

 spine proportionately shorter and stouter than be- 

 fore. Ventrolateral margin now with 8-10 small 

 plumose setae. Eyes stalked. 



Abdomen (Figure IF) with 6 somites. Somite 2 

 with small anteriorly curved knobs as before. So- 

 mites 2-5 with 2 pleopod buds ventrally. Telson as 

 in stage I. 



AN1 (Figure 3C)— With 2 long, thick aes- 



thetascs, 4 smaller aesthetascs, and 1-2 simple 

 setae or thin aesthetascs on terminal end. 



AN2 (Figure 3D) — Protopodite same as before, 

 endopodite bud at least half length of protopodite. 

 Exopodite same as before. 



MAX1 ( Figure 3F) — Endopodite same as before. 

 Basal endite with 8 terminal setae (5 denticulate 

 cuspidate and 3 plumodenticulate), and 2 subter- 

 minal plumose setae; coxal endite with 8 setae (5 

 plumose and 3 simple). 



MAX2 ( Figure 3E)— Scaphognathite with 16 ( in 

 South Carolina reared) or 20 (in Rhode Island 

 reared and field samples) plumose marginal setae. 

 Endopodite with basal endite and coxal endite 

 same as in stage I. 



MXP1 (Figure 3A)— Exopodite with 6 large 

 plumose natatory setae. Endopodite same as be- 

 fore. Basiopodite with up to 10 setae. 



MXP2 (Figure 3B)— Exopodite with 6 large, 



I- 



FIGURE Z.—Libinia emarginata. Appendages of stage II zoea. (A) first maxilliped, <B> second maxilliped, (C> antennule, <D> antenna, 



(E) maxilla, (F) maxillule. All unmarked scales = 0.1 mm. 



835 



