The Collaborative International Dictionary
Scyphistoma
Scyphistoma \Scy*phis"to*ma\, n.; pl. Scyphistomata, Scyphistom[ae]. [NL., fr. Gr. sky`fos a cup + sto`ma the mouth.] (Zo["o]l.) The young attached larva of Discophora in the stage when it resembles a hydroid, or actinian.
Wiktionary
scyphistoma
n. (context zoology English) The young attached larva of Discophora in the stage when it resembles a hydroid, or actinian.