Ishiyama M, Sasagawa I, Akai J
Arch Histol Jpn. 1984 Mar;47(1):89-94. doi: 10.1679/aohc.47.89.
The tooth plates in the living Holocephalan, Chimaera phantasma were studied by various techniques. They consisted of osteodentin and hypermineralized pleromin (kosmin). The degree of mineralization on the latter was as much as in the enameloid of Chondrichthyes and Osteichthyes. Scanning electron microscope observation indicated that the pleromin consisted of large and granular crystals. X-ray powder diffractometry, electron microprobe analysis and analytical electron microscopy revealed that the inorganic constituent of pleromin included, as an essential element, a beta-Ca3(PO4)2 (whitlockite) structure containing a small amount of Mg.
采用多种技术对现存全头亚纲鱼类银鲛的齿板进行了研究。它们由骨齿质和高度矿化的矿化骨（科斯敏）组成。后者的矿化程度与软骨鱼类和硬骨鱼类的釉质样组织中的矿化程度相当。扫描电子显微镜观察表明，矿化骨由大颗粒晶体组成。X射线粉末衍射、电子微探针分析和分析电子显微镜显示，矿化骨的无机成分作为一种基本元素，包含一种含有少量镁的β-Ca3(PO4)2（白磷钙矿）结构。
