The Collaborative International Dictionary of English v.0.48:

Testudinata \Tes*tu`di*na"ta\, n. pl. [Nl. See Testudo.]
   (Zool.)
   An order of reptiles which includes the turtles and
   tortoises. The body is covered by a shell consisting of an
   upper or dorsal shell, called the carapace, and a lower or
   ventral shell, called the plastron, each of which consists of
   several plates.
   [1913 Webster] Testudinate

WordNet (r) 3.0 (2006):

Testudinata
    n 1: tortoises and turtles [syn: Chelonia, order Chelonia,
         Testudinata, order Testudinata, Testudines, order
         Testudines]