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excluding the frontal appendages and tail fan.^{Dryad data 04} Previous body length estimation up to 1 m is unlikely based on the ratio of body parts (body length measured only about 2 times the length of frontal appendage in A. canadensis) and the size of largest frontal appendage. A. daleyae (formerly A. cf. canadensis or A. aff. canadensis) from the Emu Bay Shale of Australia is larger than A. canadensis, with the largest known appendage measuring up to 18.3 cm long, which

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