
%0 Journal Article
%A Sutherland, MD 
%A Wells, JW 
%T Pigments of marine animals. IV. The anthraquinoid pigments of the crinoids, <I>Comatula pectinata</I> L. and <I>C. cratera</I> A. H. Clark
%J Australian Journal of Chemistry
%D 1967/03/01
%V 20
%N 3
%P 515-533
%K 
%R https://doi.org/10.1071/CH9670515
%U https://www.publish.csiro.au/paper/CH9670515 
%X A review of the literature describing the pigments of the crinoids (phylum Echinodermata) reveals a prevalence of indicator-type pigments which are of unknown nature, except for certain polyhydroxy-meso- naphthodianthrones isolated from a fossilized Jurassic stalked crinoid.   The highly coloured free-swimming crinoids, Comatula pectinata L. and C. cratera A. H. Clark, contain mixtures of indicator-type pigments which have been separated by adsorption chromatography on magnesium carbonate to yield three principal constituents, the 6-methyl and the 6,8-dimethyl ethers of rhodocomatulin, and a monomethyl ether of rubrocomatulin. The structure of the rhodocomatulin skeleton is shown to be 4-butyryl-1,3,6,8-tetrahydroxyanthraquinone rather than 2- butyryl-1,3,6,8-tetrahydroxyanthraquinone as previously suggested.1 
