The ossicles are penetrated by a meshwork of spaces filled with fibers and dermal cells; the meshwork is _____________ and is unique to echinoderms.
A) Pyloric ceca
B) Radial canals
C) Polian vesicles
D) Coelomocytes
E) Stereom

Question

Quizplus · Accepted Answer

The meshwork of spaces filled with fibers and dermal cells that penetrate the ossicles is called stereom. This structure is unique to echinoderms and provides them with their characteristic rigid, calcareous endoskeleton.

The Ossicles Are Penetrated by a Meshwork of Spaces Filled