Specimen MGM-6757X (in dorsal aspect) preserving exopodal setae. (a) Overall view of specimen. Yellow arrows point to setae; black arrows indicate first and second thoracic endopods; green arrow points to left eye; blue arrowheads indicate the facial suture; white arrowheads indicate the thoracic-pygidial boundary. (b) Detail of the setae fringing the right cephalic exopods, exposed through a break in the cranidium. (c) Detail of the setae from right thoracic and pygidial exopods. The slab’s underside contains a well-preserved specimen of the graptolite “Tetragraptus” bulmani Thomas (=T. longus Lindhom), a very common species in the Araneograptus murrayi Biozone of the Fezouata Shale. Scale bar, 20 mm for (a); 10 mm for (b,c).