trochophore

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trochophore

(trŏk′ə-fôr′)
n.
The small, free-swimming, ciliated aquatic larva of various invertebrates, including certain mollusks and annelids.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

trochophore

or

trachosphere

the characteristic larva of polychaet worms, molluscs and some other invertebrates. It is more or less spherical, with a pre-oral ring of cilia called the prototroch.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005