Cambrian worms (Introduction)
by David Turell 
, Tuesday, October 09, 2012, 15:35 (4430 days ago)
All the way from 505 million years ago, these worms show little change:-http://phys.org/news/2012-10-marine-worms-reveal-deepest-evolutionary.html-Apparently they were never destined to be very complex. Is evolution pre-programmed?
Cambrian worms
by David Turell , Thursday, October 11, 2012, 15:23 (4428 days ago) @ David Turell
edited by unknown, Thursday, October 11, 2012, 15:35
These worms have not widely diversified since the Cambrian. They were diversified in the Cambrian. Darwin presents a cone-like development of diversity in his theory, but certain data from evolution such as this presentation implies that various areas of evolution may be cylindrical in development.-http://www.arn.org/blogs/index.php/literature/2012/10/11/priapulids_challenge_the_cone_of_increas-More evidence of long term stasis of oceanic forms:-http://www.sciencedaily.com/releases/2012/10/121010172116.htm