- sigmaspires
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n. pl. [Gr. the 16th letter, sigma; speira, twist](PORIFERA)Diactinal microsclere sigmas that are spirally twisted.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.