Retrieving "Radii" from the archives

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1. Stellar Sea Urchin

   Linked via "radii"

   Morphology and Anatomy
   The E. stellaris typically presents with five primary radii, although deviations to four or six arms are recorded in approximately $12\%$ of observed specimens. The entire organism is encased in a tessellated test/) composed of aragonite plates saturated with trace amounts of an unknown, highly refractive element provisionally termed 'astratine' [2]. This composition is responsible for the organism's characteristic faint, intermittent blue-green light, …