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Issue 8, 2005
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Calcium sulfate hemihydrate is the inorganic mineral in statoliths of Scyphozoan medusae (Cnidaria)

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Abstract

Scyphomedusae use inorganic crystals (statoliths) for gravity sensing. The organs which contain the statoliths are called rhopalia. Rhopalia of five different species of the three different orders of the class Scyphozoa were studied with high-end solid-state chemical methods to elucidate the crystallographic nature of the biomineral: synchrotron powder diffraction, synchrotron single-crystal diffraction, synchrotron microtomography, scanning electron microscopy, and energy dispersive X-ray spectroscopy. Each rhopalium contains a large number of statoliths in an ordered way. The statoliths of all species consist of calcium sulfate hemihydrate, a water-deficient phase. This is remarkable for sea-living organisms consisting mostly of water. The phylogenetic relationships within the class Scyphozoa are discussed.

Graphical abstract: Calcium sulfate hemihydrate is the inorganic mineral in statoliths of Scyphozoan medusae (Cnidaria)

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Publication details

The article was received on 20 Oct 2004, accepted on 01 Mar 2005 and first published on 09 Mar 2005


Article type: Paper
DOI: 10.1039/B416246C
Dalton Trans., 2005, 1545-1550

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    Calcium sulfate hemihydrate is the inorganic mineral in statoliths of Scyphozoan medusae (Cnidaria)

    A. Becker, I. Sötje, C. Paulmann, F. Beckmann, T. Donath, R. Boese, O. Prymak, H. Tiemann and M. Epple, Dalton Trans., 2005, 1545
    DOI: 10.1039/B416246C

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