出典:Wikipedia
出典:『Wikipedia』 (2011/04/24 18:47 UTC 版)
Fossils of Spriggina are known from the Ediacaran period, around 550 million years ago. The segmented organism reached about 3 cm in length and may have been predatory. Its bottom is covered with two rows of tough interlocking plates, while one row covered its top; its front few segments fused to form a head, which may have borne eyes and antennae.