pronymph

noun2

1. •
   An arthropod hatchling still inside its embryonic cuticle, often specialized for breaking the eggshell or leaving the oviposition site; a prolarva.
2. •
   A prepupa with externally visible pupal traits.

   • The transition from eonymph to pronymph was marked by a certain number of morphological modifications and by the progressive formation of the pupal eye. — 1998