Malacodermata

from The Collaborative International Dictionary of English v.0.48

Malacoderm \Mal"a*co*derm\, n. [Gr. malako`s soft + ? skin.]
   (Zool.)
   One of a tribe of beetles ({Malacodermata}), with a soft and
   flexible body, as the fireflies.
   [1913 Webster]