Morphology and growth of lepidosirenid lungfish tooth plates (Pisces: Dipnoi)
Morphology and growth of lepidosirenid lungfish tooth plates (Pisces: Dipnoi)
复制标题
鳞甲类肺鱼牙板的形态和生长（双鱼座：Dipnoi）
DOI：
10.1002/jmor.1051790108
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发表时间：
1984
影响因子：
1.5
通讯作者：
W. Bemis
中科院分区：
文献类型：
--
作者：
W. Bemis
对原鳍鱼和鳞鱼的齿板结构进行了研究，以确定幼虫后期形状变化的原因和后果。在生长过程中，齿板的基底面积增加，一些尖突变得更加突出，剪切面变尖。颌关节限制了下颌的活动范围，并使齿板精确咬合;由此产生的磨损模式是有规律的。齿板由釉质、小梁牙本质和岩牙本质组成。岩牙本质柱形成齿板的核心;其两侧是小梁牙本质。显微硬度测量表明，小梁牙本质的硬度与哺乳动物牙本质相当，而岩牙本质与釉质相当。这些组织的位置和差异磨损产生了成人牙板的突出尖和自磨刃。
The structure of the tooth plates of Protopterus and Lepidosiren was investigated to determine the causes and consequences of postlarval shape change. During growth, the basal area of the tooth plates increases, some cusps become more prominent, and shearing surfaces are sharpened. The jaw articulation restricts the range of movements of the lower jaw, and causes the tooth plates to occlude precisely; the resulting wear patterns are regular. The tooth plates are composed of enamel, trabecular dentine, and petrodentine. A petrodentine column forms the core of a tooth plate; it is flanked by trabecular dentine. Microhardness measurements show that trabecular dentine is comparable in hardness to mammalian dentine, whereas the petrodentine is comparable to enamel. The location and differential wear of these tissues produce the prominent cusps and self‐sharpened blades of the adult tooth plates.