placoid

shagreen Untanned sharkskin retaining the placoid scales;

鲨留盾鳞未鞣制鲨；

denticle The tooth-like scale of elasmobranchs; placoid scale of cartilaginous fish; also called dermal denticle.

细鳞板鳃类像牙齿一样鳞片;软骨盾鳞;也被称为表细鳞。

dentine A hard mesodermal material in teeth and some scales (cosmoid, ganoid and placoid scales) produced by odontobasts.

齿质组成牙齿或某些鳞片(硬鳞与盾鳞)中层坚硬物质。

enamel A shiny hard material covering the dentine of teeth and the surface of some scales (cosmoid and placoid scales).

珐琅有光泽坚硬物质包覆在牙齿及一些鳞片(圆鳞与盾鳞)表面。这是脊椎动物所产生最坚硬物质。

stomodeal denticles Special placoid scales lining the mouth and pharyngeal cavities of some Elasmobranchii, e.g. Heterodontus.

口道小齿在一些板鳃亚纲嘴巴与咽洞里特化盾鳞，例如虎鲨。