Brachymerinthus helferi, syntype: A, B. Body dorsal and lateral view; C. Head ventral view; D. Head apex and mandibles, dorsal view; E. Head dorsal view; F. Head lateral view; G. Antenna; H. Distal part of metatibia, lateral view; I. Metatibia apex posterior view showing narrow scaleless corbel bevel; J. Metatarsus; K. Labels. Abbreviations: mn-pc – permanent mandibular process (pedicel); mn-sc – scar.