shield-bearer

from The Collaborative International Dictionary of English v.0.48

Shield-bearer \Shield"-bear`er\, n.
   1. One who, or that which, carries a shield.
      [1913 Webster]

   2. (Zool.) Any small moth of the genus {Aspidisca}, whose
      larva makes a shieldlike covering for itself out of bits
      of leaves.
      [1913 Webster]