In 1966, the Geological Survey of Canada began a comprehensive revision of the Burgess Shale fossil record, led by Cambridge University paleontologist Harry B. Whittington. In the process of this revision, Whittington and his students Simon Conway Morris and Derek Briggs would discover the true nature of "Anomalocaris" and its relatives, but not without contributing to the history of misinterpretations first. In 1978, Conway Morris recognized that the mouthparts of "Laggania" were identical to "Peytoia", but concluded that "Laggania" was a composite fossil made up of "Peytoia" and the sponge "Corralio undulata". In 1979, Briggs recognized that the fossils of "Anomalocaris" were appendages, not abdomens, and proposed that they were the walking legs of a giant arthropod, and that the feeding appendage Walcott had assigned to "Sidneyia" was the feeding appendage of "Anomalocaris". Later, while clearing what he thought was an unrelated specimen, Harry B. Whittington removed a layer of covering stone to discover the unequivocally connected frontal appendage thought to be a shrimp tail and mouth thought to be a jellyfish. Whittington linked the two species, but it took several more years for researchers to realize that the continuously juxtaposed "Peytoia", "Laggania" and frontal appendage actually represented a single, enormous creature. The two genera are now placed into the order Radiodonta, which commonly known as radiodont or anomalocaridid. Because "Peytoia" was named first, it became the correct name for the entire animal. The original frontal appendage, however, came from a larger species distinct from "Peytoia" and ""Laggania"", which retains the name "Anomalocaris".