Entomology by Cedric Gillott (auth.)

By Cedric Gillott (auth.)

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Tiegs, O. , and Manton, S. , 1958, The evolution of the Arthropoda, BioI. Rev. 33:255-337. Wheeler, W. , and Hayashi, C. Y, 1993, Arthropod phylogeny: A combined approach, Cladistics 9: 1-39. Whittington, H. , 1985, The Burgess Shale, Yale University Press, New Haven. , 1990, Invertebrate Relationships: Patterns in Animal Evolution, Cambridge University Press, London. 23 ARTHROPOD EVOLUTION 2 Insect Diversity 1. Introduction In this chapter we shall examine the evolutionary development of the tremendous variety of insects that we see today.

The most popular theory for the origin of wings undoubtedly has been the PARANOTAL THEORY, first proposed by Woodward (1876, cited in Hamilton, 1971), and supported by Sharov (1966), Hamilton (1971), Wootton (1976), Rasnitsyn (1981), and others. Essentially the theory stated that wings arose from rigid, lateral outgrowths (paranota) of the thoracic terga that became enlarged and, eventually, articulated with the thorax. 1B), fully developed and articulated wings occur only on the meso- and metathoracic segments.

2. A proposed ground plan of wing articulation and wing venation. 3, the two systems representing the different interpretations made by the authors. [After J. Kukalova-Peck, 1983, Origin of the insect wing and wing articulation from the arthropodan leg, Can. J. Zool. 61: 1618-1669. 3B). This alteration of alignment made wing flexing possible. 3B that the two axes along which folding occurs (the basal and vannal folds) cross in the vicinity of the first axillary sclerite. SB) pulls the wing dorsally and posteriorly over the body.

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