This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ... tree of the suborder, and should bear the name of the man who has done more than any other worker to further our knowledge of the Odonata, namely Baron de Selys-Longchamps. In contrast to the Coenagrioninae the Protoneurinae do not have the reduction in the number of postnodals, they are as numerous ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ... tree of the suborder, and should bear the name of the man who has done more than any other worker to further our knowledge of the Odonata, namely Baron de Selys-Longchamps. In contrast to the Coenagrioninae the Protoneurinae do not have the reduction in the number of postnodals, they are as numerous in Selysioneura (fig. 153) as in Disparoneura (fig. 132). Ill--tendencies in specialization These have been rather fully discussed in previous papers, particularly by Dr. Needham (1903a) for the order Odonata as a whole, and by Dr. Calvert (1913) for the Zygoptera with special reference to the Megapodagrioninae. It is my purpose here to review their opinions and to add a few observations of my own. I think it must be apparent from the preceding discussion on the phylogeny that the outstanding features in the development of the Zygoptera are a constant reduction and simplification of venation. At any rate this is true from the standpoint of comparative morphology and to a certain degree it seems to be so paleontologically. As might be expected this reduction is to some extent accompanied by a decrease in the power of flight. Dr. Calvert says, "Many of the ideas which have been expressed on the changes which have taken place in the venation of the Odonate wings have been based on the comparative morphology of living representatives of the order or on mechanical advantage. It does not follow that these foundations are trustworthy or that there has always been mechanical improvement in the wings. Degeneration is just as probable as progressive development. The actual course of phylogeny cannot be deduced from these considerations or from the data of morphology. It seems therefore desirable to attempt to ascertain what paleontological evidence...
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Add this copy of A Venational Study of the Suborder Zygoptera (Odonata): to cart. $15.42, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of A Venational Study of the Suborder Zygoptera (Odonata): to cart. $25.67, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
Add this copy of A Venational Study of the Suborder Zygoptera (Odonata): to cart. $26.58, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of A Venational Study of the Suborder Zygoptera (Odonata): to cart. $38.96, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
