Choi and Hong: Lan/al development of Metapenaeopsis dalei 
285 
Second pereiopod (Fig. 7 J ): Biramous; coxa naked, basis 
with four setae; endopod three-segmented with 2, 2, 7 se- 
tae; exopod with 10 plumose setae. 
Third pereiopod (Fig. 7K): Biramous; coxa naked, basis 
with three setae; endopod three-segmented with 2, 2, 7 se- 
tae; exopod with 10 plumose setae. 
Fourth pereiopod (Fig. 7L): Biramous; coxa naked, basis 
with four setae; endopod three-segmented with 2, 2, 7 se- 
tae; exopod with nine plumose setae. 
Fifth pereiopod (Fig. 7M): Biramous; coxa naked, basis 
with three setae; endopod three-segmented with 2, 2, 7 se- 
tae; exopod with nine plumose setae. 
Abdomen (Fig. 6, A and B): Dorsomedian spines on the 
4th, 5th and 6th abdominal somites; one pair of lateral 
spines on 5th and 6th abdominal somites; one pair of lat- 
eroventral spines on the 6th abdominal somite. 
Uropod (Fig. 7N): Protopod with one spine; endopod with 
11 marginal plumose setae; exopod with one marginal 
spine and 13-15 marginal plumose setae. 
Telson (Fig. 7N): Narrow and deep median notch with 
seven pairs of setae and one pair of plumose setae. 
Second mysis stage (Fig. 6, C and D; Fig. 8, A-O) 
Size TL: 3.71 mm (3.16-4.54 mm; SD=0.29; n = 19) 
CL: 0.87 mm (0.69-1.10 mm; SD=0.09; n=19) 
Carapace (Fig. 6, C and D): Covering thoracic somites; 
one pair of supraorbital, antennal, pterygostomial, and he- 
patic spines, 10 anteroventral and three ventroposteror 
spines on each marginal side; rostrum long with one dor- 
sal tooth. 
Antennule (Fig. 8A): Uniramous; peduncle three-seg- 
mented, 1st segment with one large ventral spine, one 
small proximal seta and 14 setae, 2nd segment with eight 
setae, 3rd segment with three setae; outer and inner ra- 
mus unchanged. 
Antenna (Fig. 8B): Biramous; protopod two-segmented, 
2nd segment with one basial spine; endopod three-seg- 
mented with 0, 0, 2 setae; scaphocerite with 19 marginal 
plumose setae. 
Mandible (Fig. 8C): Left mandible with three denticu- 
late setae; right mandible with seven denticulate setae; 
mandibular palp unsegmented. 
Maxillule (Fig. 8D): Biramous; coxal endite with six 
plumed and two naked setae, basial endite with six stout 
setae and three setae; endopod unchanged; exopod absent. 
Maxilla (Fig. 8E): Biramous; endites with 15, 5, 7, 7, 
3 setae; endopod four-segmented with 2, 2, 2, 3 setae; 
scaphognathite with 16 plumose setae. 
First maxilliped (Fig. 8F): Biramous; coxa with eight se- 
tae, basis with 15 setae; endopod four-segmented with 4, 3, 
2, 5 setae; exopod with nine plumose setae. 
Second maxilliped (Fig. 8G): Biramous; coxa with two 
setae, basis with 10 setae; endopod five-segmented with 4, 
5, 1, 2, 6 setae; exopod with six plumose setae. 
Third maxilliped (Fig. 8H): Biramous; coxa naked, basis 
with two setae; endopod five-segmented with 2, 3, 3, 3, 4-5 
setae; exopod with 8-9 plumose setae. 
First pereiopod (Fig. 81): Biramous; endopod chelate; 
coxa naked, basis with two setae; endopod five-segmented 
with 1, 2, 2, 4, 2 setae; exopod with 10 plumose setae. 
Second pereiopod (Fig. 8J): Biramous; endopod chelate; 
coxa naked, basis with one seta; endopod five-segmented 
with 2, 3, 3, 3, 3 setae; exopod with 10 plumose setae. 
Third pereiopod (Fig. 8K): Similar to 1st pereiopod. 
Fourth pereiopod (Fig. 8L): Coxa naked, basis with three 
setae; endopod five-segmented with 2, 3, 3, 5, 2 setae; exo- 
pod with 9-10 plumose setae. 
Fifth pereiopod (Fig. 8M): Similar to 4th pereiopod. 
Abdomen (Fig. 6C, D): Similar to 1st mysis stage. 
Pleopods (Fig. 8N): Two-segmented and uniramous, 
without setae. 
Uropod (Fig. 80): Biramous; protopod with one spine; 
endopod with 14 plumose setae; exopod with one fused 
spine and 19 plumose setae. 
Telson (Fig. 80): Median notch less deep with seven 
pairs of plumose setae and one posteromedian spine. 
Third mysis stage (Fig. 6, E and F; Fig. 9 A-J; Fig 10, A-E) 
Size TL: 4.45 mm (3.99-4.88 mm; SD=0.25; n=20) 
CL: 1.13 mm (0.96-1.31 mm; SD=0.10; n=20) 
Carapace (Fig. 6, E and F): Covering thoracic somites; 
one pair of supraorbital, antennal, pterygostomial and he- 
patic spines, 10 anteroventral and three posteroventral 
spines on each marginal side; rostrum long with two dor- 
sal teeth. 
Antennule (Fig. 9A): Uniramous; peduncle three-seg- 
mented: 1st segment with one large ventral spine, one 
small proximal spine, 27 plumose setae and statocyst; 2nd 
segment with 12 plumose setae; 3rd segment with seven 
plumose setae; outer ramus with eight aesthetascs; inner 
ramus unchanged. 
Antenna (Fig. 9B): Biramous; protopod unsegmented with 
one spine; endopod nine-segmented, 1st segment with one 
spine; scaphocerite with 22 plumose setae and one spine. 
Mandible (Fig. 90: Left mandible with seven denticu- 
late setae; right mandible with three denticulate setae; 
mandibular palp bud present. 
Maxillule (Fig. 9D): Biramous; coxal endite with eight 
setae, basial endite with eight stout setae and three setae; 
endopod three-segmented with 2, 2, 5 setae. 
Maxilla (Fig. 9E): Biramous; endites with 11, 5, 8, 8, 
4 setae; endopod four-segmented with 3, 1, 2, 3 setae; 
scaphognathite with 24 plumose setae. 
First maxilliped (Fig. 9F): Biramous; coxa with 10 setae, 
basis with 18 setae; endopod four-segmented with 4, 2, 4, 
5 setae; exopod with 10 plumose setae. 
Second maxilliped (Fig. 9G): Biramous; coxa naked, ba- 
sis with eight setae; endopod five-segmented with 4, 5, 2, 
2, 5 setae; exopocl unchanged. 
Third maxilliped (Fig. 9H): Biramous; coxa naked, basis 
with two setae; endopod five-segmented with 2, 3, 3, 3, 5 
setae; exopod with nine plumose setae. 
First pereiopod (Fig. 10A): Biramous; coxa naked, basis 
with three setae; endopod five-segmented with 2, 3, 2, 4, 2 
setae; exopod unchanged. 
Second pereiopod (Fig. 10B): Similar to 1st pereiopod. 
Third pereiopod (Fig. IOC): Similar to 1st pereiopod. 
Fourth pereiopod (Fig. 10D): Biramous; coxa naked, ba- 
sis with two setae; endopod five-segmented with 2, 2, 2, 4, 
2 setae; exopod with 10 plumose setae. 
