Figure 4

Leanchoilia superlata Walcott, 1912, tergites and body flexure. A, ROM 61870, dorsal view showing tripartite organisation of tergites, arrow marks border between axial region and tergo-pleurae, image flipped horizontally; B, ROM 61863, close up of tergites, arrows mark border between axial region and tergo-pleurae; C, ROM 61905, strongly dorsally flexed specimen, arrows indicate insertion areas of appendages; D, ROM 61875, lateral view of dorsally flexed specimen; E- F, Tergo-pleurae with serrate margin (arrows); E, ROM 61866; F, ROM 61871; G, ROM 61873, close up of tergites with carinae, arrows indicate border between axial region and tergo-pleurae; H, ROM 61906, strongly ventrally flexed specimen; I, ROM 61875, detail of carinae drawn out into posteriorly pointing spine (arrow); abbreviations as before.