There are several species of proto-mantis shrimp that show similarities to Daidal acanthocercus, but each of them can easily be distinguished based on details of the tailfan.
The most similar species, Daidal schoellmanni, can be recognised by having the inner branch of the uropods terminate in a sharp tip, whereas the inner branches of the uropods of D. acanthocercus are rounded. However, D. schoellmanni has only been described from the Carboniferous of Westphalia in Germany.
Another species of proto-mantis shrimp, named Bairdops beargulchensis, has been described from the same locality as D. acanthocercus. It has a distinctly different tailfan.