Source : Webster's Revised Unabridged Dictionary (1913)

Scyphistoma \Scy*phis"to*ma\, n.; pl. {Scyphistomata},
   {Scyphistom[ae]}. [NL., fr. Gr. ? a cup + ? the mouth.]
   (Zo["o]l.)
   The young attached larva of Discophora in the stage when it
   resembles a hydroid, or actinian.