Fig. 4 in A new middle Cambrian trilobite with a specialized cephalon from Shandong Province, North China

Fig. 4. Ontogenetic series of a ptychoparioid trilobite Phantaspis auritus gen. et sp. nov. from the middle Cambrian (Miaolingian, Wuliuan) Mantou Formation, Longgang section, Shandong Province, North China. A. NIGPAS 172113, complete exoskeleton in meraspid degree 4. B–F. Complete meraspid stage cranidia. B–E. NIGPAS 172114a–d, respectively. F. NIGPAS 172116. G–Q. Holaspid cranidia. G. NIGPAS 172115. H–K. NIGPAS 172117–172120, respectively. L. NIGPAS 172123. M, N. NIGPAS 172121, 172122, respectively. O. NIGPAS 172124. P. NIGPAS 172106. Q. NIGPAS 172125. Scale bars: A, 0.5 mm; B–D, I, J, 1 mm; E–H, K–Q, 2 mm.