Fossils of Spriggina are known from the Ediacaran period, around {ma|550}. The segmented organism reached about 3–5 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. Spr.....
Found on
http://en.wikipedia.org/wiki/Spriggina
(from the article `trilobite`) ...trilobites originated during the Precambrian (3.96 billion to 540 million years ago). An organism that may be ancestral to the trilobites, as well ...
Found on
http://www.britannica.com/eb/a-z/s/145
No exact match found.
