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Links to interesting videos illustrating some of the organisms and processes related to this chapter, updated on a regular basis.
Echinoderms: The Timetree of Life
http://www.timetree.org/public/data/pdf/Smith2009Chap38.pdf
Vertebrates: The Timetree of Life
http://www.timetree.org/public/data/pdf/Hedges2009Chap39.pdf
Three Hypotheses about the Origin of Chordates
https://www.youtube.com/watch?v=dWFEAVgdXa4
Amphioxus, the Quintessential Chordate
https://www.youtube.com/watch?v=_dEq5QXaulU
Chordates: We’re All Family
https://www.youtube.com/watch?v=pmPZNtCZmWI
What Makes a Vertebrate a Vertebrate?
http://www.ucmp.berkeley.edu/vertebrates/vertmm.html
The Vertebrate Body Plan