expression, noun
living fossil
Refers to a species that has remained unchanged for millions of years and resembles fossils of ancient organisms. Used both in biology and figuratively for something outdated.
シーラカンスは生きている化石と呼ばれている。
The coelacanth is called a living fossil.
彼の考え方は生きている化石だ。
His way of thinking is a living fossil.