Figure 1.

Arkonips topororum, Middle Devonian, Arkona Shale, Hungry Hollow, Ontario; UMMP 73795. (a–c) ×2: (a) dorsal view; (b) explanatory drawing; (c) stereo-pair of ventral side of reconstruction based on scanning. (d–f) Anterior end: (d) stereo-pair of dorsal side of reconstruction, ×4; (e) stereo-pair of ventral side of reconstruction, ×4; (f) dorsal side, ×5. (g) Stereo-pair of mid-trunk section, dorsal view, ×4. (h) Anterior part of trunk, dorsal view, ×5. (i) Posterior termination, dorsal view, ×5. (j) Right parapodia, dorsal view, ×9. Numbers refer to trunk appendages except where prefixed by H, when they refer to head appendages; ch, chaetae; dc, possible dorsal cirrus; pc, pygidial cirrus; u, unknown grooved structure; m, possible mouth.