LIFE CYCLE OF PARACYCLOPS 



51 



Fig. 9 P.fimbriatus. Copepodid I. A, Mandible, posteroventral; B, Maxillule, ventral; C, Labrum, ventral; D, Maxilla, anterior; E, Maxilliped, pos- 

 terior. Scale bar in urn. 



outermost seta, 2 inner plumose setae distally and 1 naked 

 seta on dorsal outer margin. Anal operculum ornamented 

 spinular row. 



Antennule 5-segmented (Fig. 7A); aesthetasc at antero-distal 

 angle of apical segment sharing common base with adjacent 

 seta, as in all subsequent stages, including adult. Setal formula 3, 

 3,3+1 aesthetasc, 3,7 + 1 aesthetasc. 



Antenna 5-segmented (Fig. 8A); coxa unarmed; basis with 

 vestigial exopod bearing 2 naked setae, one apically and one 

 halfway along inner margin. Basis armed with 2 inner angle 

 setae. Endopod 3-segmented; setal formula 1, 4, 6. Labrum (Fig. 

 9C) with strong denticles along mid posterior margin. 



Mandible (Fig. 9A) with well developed gnathobase bearing 

 row of sharp blades medially, and 1 spinulose seta at inner distal 

 angle. Vestigial mandibular palp with 2 long plumose setae and 1 



naked seta distally. Inner posterior margin of mandible with two 

 spinular rows. 



Maxillule with strong praecoxa and reduced 2-segmented 

 palp (Fig. 9B). Praecoxal endite armed with 4 setae articulating 

 at base and 4 spines fused to segment. Proximal segment of palp 

 derived from coxa and basis, bearing 2 naked and 1 spinulose 

 inner margin setae, plus outer seta representing exopod. Distal 

 segment of palp representing endopod, armed with 3 naked 

 setae. 



Maxilla (Fig. 9D) consisting of praecoxa, coxa, basis and 

 2-segmented endopod. Praecoxa with single indistinct endite 

 armed with 2 plumose setae. Coxa with inner seta at midlength 

 and distal endite bearing strong plumose seta and naked seta 

 apically. Basis with 3 setae distally. Endopod with 2 setae on 

 proximal segment and 3 setae terminally. 



