JACKSON ET AL.; KEY TO GENERA OF PENAEID LARVAE 



Metapenaeopsis palmensis 



The details of setation and segmentation for 

 the various appendages are given in Figures 8 to 

 14 and in Table 2. The general development of 

 M. palmensis parallels A. forniosus, and only 

 significant differences are given in the following 

 text. 



PROTOZOEA. Second antenna 0.7-1.0 times 



length of 1st antenna throughout protozoeal 

 stage; 2nd antennal formula 1+2+2. Telson setal 

 formula of 7+7 does not change until mysis II. 

 E.xopod of 2nd antenna bears 10 or 11 setae along 

 its inner margin. 



First substage (Table 2, Fig. 8a) with oval 

 carapace bearing frontal organs and, above 

 them, a prominent pair of pointed spines pro- 

 jecting forward between the 1st antennae. 

 Length of these spines appro.ximately equal to 



Figure 8. — Metapenaeopsis palmensis protozoea I. (a) whole animal, (b) ventral view of cephalothora.x, (c) 1st antenna, 

 (d) 2nd antenna, (e) mandibles, (f) 1st maxilla, (g) 2nd maxilla, (h) 1st ma.xilliped, (i) 2nd ma.xilliped. Scale = 0.1 mm. 



717 



