Japan 1977 | Japan 2012 |
Horseshoe Crab Tachypleus tridentatus (Limulidae) |
Horseshoe Crab Tachypleus tridentatus (Limulidae) |
Horseshoe Crab Tachypleus tridentatus (Limulidae) (XIPHOSURIDA) |
Atlantic Horseshoe Crab Limulus polyphemus (Limulidae) (XIPHOSURIDA) |
Horseshoe Crab Dubbolimulus peatae (Limulidae) (XIPHOSURIDA) |
A living fossil means the living thing of a system which prospered 10 million years or hundreds of millions of years ago and is also continuing being useful while leaving a still more primitive still now. A horseshoe crab can be raised to the typical thing of the animal currently called this "living fossil." The horseshoe crab fossil of the Jurassic period discovered from ZorunHohen of Germany and the Bayern district has stopped the original form very well, and the marks on which it crawled are also left behind splendidly.
On the present earth, only two kinds, the horseshoe crab distributed over Setonaikai, northern Kyushu, Taiwan, the China continent east coast, the Philippines, Vietnam, Borneo, Jawa, and Sumatra and the U.S. horseshoe crab distributed over east coast one of the North America continent and the Yucatan Peninsula, live.