FIGURE 1. — Megalopa oCChionoecetes bairdi; antennule and antenna from right side of specimen (a) dorsal view of entire specimen; 

 (b) lateral view of carapace; (c) lateral view of entire specimen; (d) antennule; (e) antenna. 



ANTENNULE (Figure Id)— Three-segmented 

 peduncle has terminal pair of segmented rami. 

 Smaller ramus has two segments. Distal segment 

 has four setae, proximal shorter segment naked. 

 Second terminal ramus has four segments. 

 Number of setae per segment, beginning distally, 

 5, 3, 10, and 0. 



ANTENNA (Figure le)— Antenna has eight 

 segments. Setation formula is 4, 0, 2, 4, 0, 3, 2, and 

 1. Setae located on distal ends of segments. 



MANDIBLE (Figure 2a)— Mandibular palp has 

 three segments. Distal segment has about 10 

 setae; middle and proximal segments naked. 



MAXILLULE (Figure 2b)— Endopodite has one 

 hook-shaped segment with two terminal setae. 

 Basipodite has 20-23 coarse plumose setae. 

 Smaller coxopodite has 13-16 coarse plumose 

 setae. 



MAXILLA (Figure 2c)— Exopodite (scaphag- 

 nathite) outer margin lined with 38 plumose 

 setae. One endite naked and ends in a point. Two 

 endites heavily bifurcated. Lobes of basal endite 



distally bear 10 and 8 plumose setae, respectively, 

 and lobes of coxal (proximal) endite bear 6 and 10 

 plumose setae. 



FIRST MAXILLIPED (Figure 2d)— Epipodite 

 has eight long hairs. Exopodite is two segmented 

 with six heavily plumose setae; setation formula is 

 5 and 1. Broad endopodite has three spines on 

 distal end. Basal endite bilobed with 22-29 

 plumose setae on larger lobe and 11-14 plumose 

 setae on smaller. 



SECOND MAXILLIPED (Figure 2e)— 

 Epipodite has three hairs. Exopodite has two seg- 

 ments with five heavily plumose setae on distal 

 segment. Endopodite has four segments; setation 

 formula 9, 4, 1, and 1. 



THIRD MAXILLIPED (Figure 2f)— Epipodite 

 well developed with several nonplumose hairs. 

 Exopodite two segmented with five terminal setae. 

 Endopodite has five large segments with numer- 

 ous spines on all segments; setation formula 8, 

 15-17, 8-10, 8, and 30-34. 



PEREIOPODS (Figures la, 2g)— Pereiopods 



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