Oura megale n. gen. n. sp., a large early Cambrian deuteropod with a delta-shaped tailpiece

We describe Oura megale n. gen.n. sp., a large (ca.14 cm long) euarthropod from the lower Cambrian Chengjiang Konservat-Lagersttte of Yunnan Province, China.It possesses stalked, compound eyes and a possible raptorial frontal appendage (synapomorphies and symplesiomorphies of lower stem-and upper stem-group euarthropods, respectively), but in combination with deuteropodan synapomorphies (e.g., a multi-segmented head).Micro-X-ray fluorescence shows a thorax that consists of 10 comparatively long and five comparatively short segments.The terminal segment articulates with a large, delta-shaped tailpiece that may have conferred high positional manoeuvrability in the water column.The phylogenetic position of O. megale n. gen.n. sp. in the euarthropod stem may add support to the homology of raptorial frontal appendages between lower stem-group euarthropods and deuteropods.