- nematotheca
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n. [Gr. nema, thread; theke, case](CNIDARIA: Hydrozoa)In Leptomedusae, small stemmed structures from which nematophores develop; one-chambered, single and immovable; two-chambered, shaped like a wineglass, with upper chamber capable of limited movement on its stem.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.