Exceptionally preserved arthropod fossils from the Cambrian have gained a lot of attention as researchers hope to elucidate the arthropod stem lineage (e.g., Waloszek et al., 2007; Edgecombe, 2010). Progress is being made, though some issues remain contentious, because consensus on arthropod phylogeny seems as elusive as ever. These uncertainties hamper attempts to characterize the ground pattern of Euarthropoda through studies of extant taxa alone. While this makes the fossils all the more valuable, it also complicates their interpretation, as we do not always know what morphology to expect for representatives of a given stem lineage. This is...

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