Moulting behaviors in trilobites are a crucial strategy during development. Previous studies have demonstrated inter-and intraspecific variability of moulting behavior trilobites. Currently, ecdysial motifs for considered not stable even within species and fewer detailed dealt with single trilobite Here large sample meraspid to holaspid exuviae Arthricocephalites xinzhaiheensis (131 specimens) ...

—Ontogenetic stages of trilobites have traditionally been recognized on the basis of the development of exoskeletal segmentation. The established protaspid, meraspid, and holaspid phases relate specifically to the development of articulated joints between exoskeletal elements. Transitions between these phases were marked by the first and last appearances of new trunk segment articulations. Here...