Metaspriggina

From Wikispecies
Jump to: navigation, search

Metaspriggina is an early chordate, dated at 505 million years ago.[1] Specimen fossils have been discovered by Jean-Bernard Caron at Marble Canyon, in the Canadian Rockies. They were identified by Simon Conway Morris, as a type of fish which he had first discovered in 1978. The specimens are two inches long, without jaws, but with a cartilage notochord. The specimen possesses two upward-looking eyes, gills, liver, and W-shaped muscles along the entire length of the body, similar in function to the muscles of today's fish.[2]

  1. Conway Morris, Simon and Caron, Jean-Bernard (2014). "A primitive fish from the Cambrian of North America". Nature. doi:10.1038/nature13414.  Letter with cladogram
  2. Carl Zimmer, (June 11, 2014) "A Long-Ago Ancestor: A Little Fish, With Jaws to Come" The New York Times accessdate=2014-06-11