tessellata

from The Century Dictionary.

• A group of tessellate Paleozoic sea-urchins, synonymous with Palæchinoidea.
• Tessellated crinoids; an order of Crinoidea, having the calyx formed entirely of calcareous plates, and the oral surface without ambulacral furrows, as in the genera Actinocrinus and Cyathocrinus.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) A division of Crinoidea including numerous fossil species in which the body is covered with tessellated plates.