holaspis

noun1

1. •
   A stage in the development of a trilobite at which the creature has gained its adult segmentation, but continues to molt and grow.

   • The pygidial spines are stout and direct outward in the early holaspis (Fig. 2, A-B, F), but become slender and direct inward in the late holaspis (Fig. 2, D, E). — 2008