Xandarellida is an extinct order of artiopod arthropods known exclusively from the Middle Cambrian of China and Siberia.

Is was often referred to by the name Petalopleura in historical publications, but this grouping was later considered to be more poorly defined than Xandarella, which is now used in preference to it.

[3] Phytophilaspis has an especially intricate head shield, sharing its tripartite nature with Xandarella alongside bearing several sutures all over its body and seemingly having almost completely fused tergites.

[5] Luohuilinella has a large amount of tergites (with the type species having 27) but otherwise resembles other xandarellids save for an unfused three-segmented pygidium.

[6] Sinoburius resembles Xandarella in having an elongate posterior spine and Phytophilaspis in having all but a few tergites fused, although it exhibits secondary loss of eye slits.