Abstract
A different reactivity of the demosponge Chondrosia reniformis pinacoderm with regard to crystalline and amorphous silica is described. Following the crystalline quartz particle settlement, the pinacoderm breaks and exopinacocytes contract to form a rim around this foreign material that becomes gradually incorporated. Instead, amorphous opaline spicules elicit a motile response of exopinacocytes. At the onset of this process they lay a thin homogeneous matrix on the spicule, while afterwards several exopinacocytes join together forming a cellular coat covering the spicule. The sinking of both kinds of foreign material is allowed by the malleable organization of the collagenous ectosome. The effect of different silica crystalline forms on sponge cells is discussed by considering similar phenomena in other animals.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
