Interpretation of specimen in Fig. 1f (MGM-6756X). View shows ventral structures in right-hand side: antenna (ant), three cephalic endopods (ce1–3) and first thoracic endopods (te1–2). Appendages are recognised by iron-stained external moulds, but some still preserve the casts (ce1, ce3, te1, te2). The second and third cephalic endopods are heavily armoured with dorsal and ventral spines (yellow arrowheads). Other recognisable features are facial suture (fs), the sediment infill (white arrows) under the right librigena (rlb) and the cranidium-thoracic boundary (ctb). The dashed line corresponds to the sagittal plane of the specimen, while ‘gr’ indicates fragments of graptolite stipes that were lying on the seafloor under the trilobite. Scale bar, 10 mm.