Read e-book online Biologie et structure PDF

By Henri Laborit

ISBN-10: 2070324346

ISBN-13: 9782070324347

ISBN-10: 2070351564

ISBN-13: 9782070351565

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Figs. 126-129 illustrate the arrangement of the two copulating animals, with a semidiagrammatic reconstruction of the connecting organs (129). It is necessary that the attachment between the copulating partners be strictly dermed spatially. These mites live in the feathers of birds and are subjected to violent mechanical stresses when the bird flies; the delicate copulatory organs, the penis p and vagina v, are themselves not adequate to hold the animals together. Rather, they must be held together in a mechanically stable way, so that they cannot be shaken apart, before copulation can begin at all.

The combination has great tensile strength, and this is no doubt necessary, since the musculature of the female abdomen is certain to become fatigued during the long copulation of many dragonflies. Further details and illustrations of these remarkable adaptations are given by Pfau. The dragonflies can release the copulatory coupling very quickly. In contrast to the damselflies, which usually form a "mating chain" and then land on the ground for copulation, many dragonfly species carry out the entire reproductive act in flight.

It consists of a large number of double elements, arrayed in series and wedged together in pairs. A more detailed description is given on page 18. 1 required a precise alignment of the objects to be joined. In many cases, however, the purpose of the attachment is served even though the objects are not uniquely oriented. Here it is convenient if only one special connecting element is used, which can attach to any of a number of different places on the object to be held. The surface of the object, of course, must meet certain general requirements, which are different for the different types of connecting devices.

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Biologie et structure by Henri Laborit


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