Zoeal Stages and Glaucothoe of Trizopagurus magnifcus — Provenzano 
467 
uals, better developed than some of their sib- 
lings, were able to moult directly to the 
glaucothoe stage following this zoeal instar, 
but others, less developed, moulted into a fifth 
zoeal instar before the glaucothoe. In all fourth 
stages, however, the uropods are articulated 
with the sixth abdominal somite via a protopo- 
dite. Each exo-uropod now has a large fused 
spine at the posteriolateral margin and in addi- 
tion may have 11-13 plumose setae marginally 
with 1—4 submarginally on the ventral surface. 
The endo-uropodites usually carry 5-7 marginal 
plumose setae and may have 1-3 submarginal 
setae ventrally. The telson itself is basically 
Fig. 7. Trizopagurus magnificus. Details of the telson of the zoeal stages. 
