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The Collaborative International Dictionary
Scyphistomae

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
scyphistomae

n. (plural of scyphistoma English)

WordNet
scyphistomae