. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. Ill THE WINGS 55 strengthening the wing below the nodus, either by the recession of M2 towards the nodus, and the conversion of an intermediate cross- vein into the siihnodus (sn); or else by a similar arrangement on the part of the radial sector, the basal piece of which forms, in. A B. D Fig. 19. Phylogeny of the nodus, a, archaic condition with no nodal joint; B-c, development of MesopJilpbia-siage (siibnodus absent); d-e, addition of subnodus and completion of normal nodus formation as seen in recent Dragonflies; F, no
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. Ill THE WINGS 55 strengthening the wing below the nodus, either by the recession of M2 towards the nodus, and the conversion of an intermediate cross- vein into the siihnodus (sn); or else by a similar arrangement on the part of the radial sector, the basal piece of which forms, in. A B. D Fig. 19. Phylogeny of the nodus, a, archaic condition with no nodal joint; B-c, development of MesopJilpbia-siage (siibnodus absent); d-e, addition of subnodus and completion of normal nodus formation as seen in recent Dragonflies; F, nodal region of Telephlebia godeffroyi Selys, she\ving apparent prolongation of »%â >V nodus: ?ic nodal cross-vein; Sn subnodus. Original. Anisoptera, actually the subnodus itself. In fig. 19 a-e, I have attempted to shew sufficient successive stages in the evolution of the nodus to make the phylogeny clear. There only remains for discussion the case of the apparent prolongation of Sc through the nodus. Fig. 19 F shews the actual. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tillyard, Robin John, 1881-1937. Cambridge [Eng. ] : University Press
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