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n. pl. scyphisto·mae (-mē) or scyphisto·mas
A larva of a scyphozoan, consisting of a very small sessile polyp that successively splits off free-swimming medusas.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
scyphistomaa larval form of a COELENTERATE, arising from a planula larva, which may bud, but in autumn and winter produces EPHYRA larva by STROBILATION. see SCYPHOZOAN.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005