Also known as Neotrigonia. A bivalve mollusk of the Trigonidae family. A remnant of the Trigonia genus, which flourished from the Devonian period of the Paleozoic to the Cretaceous period of the Mesozoic, it is a "living fossil." It is distributed in the waters surrounding Australia and Tasmania and is classified into seven species, all of which are very similar. In 1801, a dead shell was discovered on the coast of Tasmania, indicating that it is still alive. The shell is a rounded rectangle that is somewhat inflated, and the surface is covered with a black-brown skin. It has about 20 radial ribs with joints, and the inside is silvery-white or purple with a strong pearlescent luster. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ネオトリゴニアともいう。サンカクガイ科の二枚貝。古生代デボン紀から中生代白亜紀に栄えたトリゴニアTrigonia(サンカクガイ)類の生残りで,〈生きている化石〉である。オーストラリアおよびタスマニア島の周縁海域に分布し,7種に分類されるが互いによく似ている。1801年にタスマニア島の海岸で死殻が発見され,現生していることがわかった。殻は丸みのある四角形で多少膨らみ,表面は黒褐色の皮をかむる。節のある放射肋が約20本あり,内面は銀白色または紫色で強い真珠光沢がある。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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