- primary spicule
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(PORIFERA)A major structural megasclere.
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.
accessory spicule — (PORIFERA) A category of megasclere, supplemental to the primary skeleton, may be located anywhere … Dictionary of invertebrate zoology
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