Chemical Zoology. Annelida, Echiuria, And Sipuncula by Marcel Florkin

By Marcel Florkin

Chemical Zoology, quantity IV: Annelida, Echiura, and Sipuncula provides chemical details on zoological importance of Annelida, Echiura, and Sipuncula. This ebook is equipped into thirteen chapters that take on the organic and biochemical elements of those phyla.
The starting bankruptcy describes the comparative anatomy, phylogeny, and category of Annelida, Echiura, and Sipuncula. The publication is going on discussing the organic points of those phyla, together with nutrients and digestion; breathing and effort metabolism; oxygen shipping; and carbohydrate and nitrogen metabolism. This quantity additionally covers those organisms' composition of guanidine compounds and phosphagens, lipids, inorganic parts, and pigments. different chapters take care of the expansion and improvement, luminescence, endocrines, and pharmacologic homes of Annelida, Echiura, and Sipuncula.
This publication is a useful source for zoologists and biochemists.

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There can be no doubt of the occurrence of transverse thickenings of the mesodermal bands, some vague repetition of the coelomic compartments, and the develop­ ment of the ventral nerve cord as a series of ganglia in Echiurus, if not in other echiurids. What is in doubt is whether this can b e regarded as a vestigial segmentation. " At best, this represents pseudometamerism and as such bears no relation to metamerism. The apparent segmentation of epidermal structures in sipunculids (papillae) and echiurids (rings of mucus glands) might have had con­ siderable confirmatory value if the transitory metamerism of the nervous system and mesodermal bands in fact took place.

Clark waves, for swimming or crawling over a solid substratum with the aid of suckers in a characteristic "looping" motion, removes all functional necessity for a spacious coelom and septa ( R . B . Clark, 1964), and leeches have neither. T h e coelom is reduced to a series of canals and the septa make only a transitory appearance during ontogeny (Bürger, 1891). Chaetae, which in burrowing worms increase the frictional forces be­ tween the body and the substratum and so increase the forward thrust that can b e generated, are functionally replaced in leeches b y suckers.

The principle on which the musculature works is that contraction of one part of the musculature increases the internal hydrostatic pressure in the animal and causes a compensatory extension of muscles elsewhere in the body. Thus contraction of a part of the body-wall musculature is antagonized by any or all other parts of the body-wall musculature ( B a t h a m and Pantin, 1950). Such a muscular system is incapable of causing rapid and powerful changes of shape in any solid-bodied animal because of the damping effect of the paren­ chymatous tissue on the transmission of fluid pressures.

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