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Aysheaia prolata Robison, 1985, was described as the only lobopodian from the Cambrian (Drumian) WheelerFormation in Utah, and the sole representative of this genus besides the type species Aysheaia pedunculata,from the Cambrian (Stage 5) Stephen Formation, British Columbia. A redescription of Aysheaia prolata revealspreviously overlooked morphological features, including segmental boundaries between putative lobopods, andcurved terminal spines on the putative anterior end. These observations undermine lobopodian affinities ofAysheaia prolata, and instead we interpret this specimen as an isolated radiodontan frontal appendage. Thepresence of 11 podomeres, five of which possess elongate and anteriorly recurved ventral blades with auxiliaryspines, together with shorter robust dorsal spines, identify the specimen as Stanleycaris Caron et al., 2010. Thisrepresents the first report of Stanleycaris outside of the Cambrian (Stage 5) thin Stephen Formation in BritishColumbia, expanding its palaeobiogeographic and stratigraphic range. Aysheaia is left as a monotypic genusendemic to the Burgess Shale. The Spence Shale luolishaniid Acinocrinus stichus is currently the onlylobopodian known from the Cambrian of Utah

Aysheaia prolata from the Wheeler Formation (Cambrian, Drumian) is a frontal appendage of the radiodontan Stanleycaris