Trilobite-like arthropod from the Lower Cambrian of the Siberian Platform

The Lower Cambrian Fossil-Lagerstätte at Sinsk (Sinsk Formation, Lena River, Siberia) yields exfraordinarily preserved fossils. A new trilobite-like arthopod from this site, Phytophilaspis pergamena gen. et sp. n., is assigned to the subclass Conciliterga Hou & Bergstróm, 1997, ord et and family indet. It is charactenzed by a large cephalon with facial sutures and relatively large eyes, strongly reduced thorax and very large pygidium. The facial sutures are not connected with the eyes; librigenae preserve marks of segmentation and may represent fused pleurae of the posterior segments of the cephalon. Unlike trilobites, the original mineralization of the carapace was very weak or absent. The new arthropod differs from all of other Conciliterga by the absence of rostral plate, posteńor position of eyes and large size of the pygidium.