MYSIS. In each substage, the carapace bears a 

 distinctive series of spines or serrations along its 

 anteroventral border (Fig. Ubj). The rostrum, 

 down-curved, extends beyond eye. All mysis 

 substages have supraorbital and pterygostomial 

 spines. Small hepatic spine may be absent in 1st 



FISHERY BULLETIN: VOL. 87. NO. 3. 1989 



substage but always present afterwards. Dorsal 

 spines sometimes on 4th abdominal segment, 

 always on 5th and 6th, and lateral spines on 5th 

 and 6th segments. 



Mysis I of M. pabnensis (Table 2, Fig. 11) 

 retains 1 pair of supraorbital spines; rostrum has 



FiciiRE 11. — Metapenaeopsis palmeiisis mysis I. (a) whole animal (dorsal view), (b) whole animal (lateral view), (b,) 

 detail-serrated anteroventral carapace margin, (c) 1st antenna, (d) 2nd antenna, (e) mandibles, (f) 1st maxilla, (g) 2nd 

 maxilla, (h) 1st maxilliped, (i) 2nd maxilliped, (.j) 3rd maxilliped, (k) 1st pereopod. Scale = 0.1 mm. 



720 



