In fact they presented a family tree very similar to Budd's except that theirs did not mention tardigrades.[1] Regardless of the different morphological interpretations, all major restudies since 1980s similarly concluded that the resemblance between Opabinia and arthropods (e.g. stalked eyes; dorsal segmentation; posterior mouth; fused appendages; gill-like limb branches) are taxonomically significant.[2][3][7][4][5]