- microcaltrop
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n. [Gr. mikros, small; ML. calcitrapa, a four-pointed weapon](PORIFERA)A microsclere tetraxon spicule with four rays, one elongated and three short; a euaster with 4 persistent rays.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.