Menu for /chordata/chordata.map


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          http://www.ucmp.berkeley.edu/chordata/urochordata.html
          http://www.ucmp.berkeley.edu/chordata/cephalo.html
          http://www.ucmp.berkeley.edu/vertebrates/basalfish/myxini.html
          http://www.ucmp.berkeley.edu/vertebrates/vertintro.html