Nature 517, 485–488 (2015); doi:10.1038/nature13866

The data matrix in the original Supplementary Data 3 of this Letter reproduced the tree topology shown in Extended Data Fig. 3 but the accompanying character descriptions did not match the coding given in the data matrix. (The numbering of character states was shifted by 1 because of a typo that occurred while editing the list in a spreadsheet, and the character state 3, which was erroneously numbered 4, was accidentally omitted from the list.) The Supplementary Information accompanying this Corrigendum contains the revised Supplementary Data 3. The revised Supplementary Data 3 also reproduces the tree topology shown in Extended Data Fig. 3 of the original Letter; note that the characters have been reordered in the revised Supplementary Data 3 for anatomical consistency.

In addition, the tree statistics originally published in the Extended Data Fig. 3 legend were wrong because they were derived from a matrix where Parvinatator was removed from the original matrix. The correct statistics reflecting all 56 taxa in the original matrix are 243 equally most parsimonious trees of TL = 529, CI = 0.423 and RI = 0.796.