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Revised chordate phylogeny based upon the new histological data for arandaspids presented herein. Dataset of Donoghue & Smith (2001) updated to included codings for arandaspids (66: 1; 67: 0; 68: 1; 69: ?; 70: 2; 73: 1) and corrected coding for Heterostraci (75: 0). 100 replicate random sequence addition heuristic search yielded 3 optimal trees at 192 steps. The inclusion of the new data resolves the arandaspids as the sister group to Astraspis.
