Ian G. Macintyre, Frederick M. Bayer, M. Amelia V. Logan, H. Catherine W. Skinner; Possible vestige of early phosphatic biomineralization in gorgonian octocorals (Coelenterata). Geology ; 28 (5): 455–458. doi: https://doi.org/10.1130/0091-7613(2000)28<455:PVOEPB>2.0.CO;2
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Skeletal carbonate hydroxylapatite, heretofore unknown in modern coelenterates, has been found in the axes and holdfasts of the gorgonian octocoral family Gorgoniidae. This carbonate apatite is a distinctive feature of this family of octocorals and may indicate a previous history of phosphatic skeletal mineralization within this phylum.