Spicular Structures in Molluscs

Abstract

Biosynthesis, structural and functional diversity of spicules and spicule-like constructs in marine molluscs remain to be hot topic for biomaterials community. Especially scare information has been obtained with regards to the nature of organic phases within both calcareous and siliceous spicules. This chapter includes discussions concerning unique spicular formations in selected species of Aplacophora, Nudibranchia, Polyplacophora as well as Onchidiella molluscs. Special attention has been paid to onchidiid sea slugs where possible existence of siliceous spicules in genital organs is debated since the first report in 1934.