Lepeopbtheirus dissimulatus — Lewis 
213 
Fig. 14. Antennule of developmental stages of L. dissimulatus (ventral view), a, First nauplius; b, second 
nauplius; c, copepodite; d, first chalimus; e, second chalimus; f, third chalimus; g, fourth chalimus; h, fifth 
chalimus; i, sixth chalimus; j, adult. 
margins of both segments are slightly irregular, 
more so in some specimens than in others. The 
first segment is slightly shorter than the second 
and is tapered rapidly in the proximal one-third 
to the narrow proximal end, the surface of at- 
tachment with the body. The second segment 
is tapered from the proximal to the slightly nar- 
rower, rounded distal end. The distal end of the 
second segment is encircled by a membrane pro- 
jecting slightly past the segment. A broadly 
angled, heavily sclerotized process projects from 
the inner portion of the distal end of the sec- 
ond segment and two lightly plumose setae 
project from the inner portion of the distal end, 
adjacent to the process; these setae are slightly 
longer than the greatest length of the appendage. 
The antennule of the second nauplius (Fig. 
lAb) is attached to the anterior ventral lateral 
