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

By Marcel Florkin

Chemical Zoology, quantity IV: Annelida, Echiura, and Sipuncula offers chemical details on zoological importance of Annelida, Echiura, and Sipuncula. This e-book is geared up into thirteen chapters that take on the organic and biochemical points of those phyla.
The commencing bankruptcy describes the comparative anatomy, phylogeny, and category of Annelida, Echiura, and Sipuncula. The booklet is going on discussing the organic facets of those phyla, together with nutrients and digestion; respiratory and effort metabolism; oxygen delivery; 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 ebook is a useful source for zoologists and biochemists.

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And that this step has been carried a step further in Poly­ gordius. It is, in fact, very difficult to find any evidence which permits a decision whether the simplicity of adult Polygordius is primitive or secondary. Since the structure of the adult worm provides no clear guidance, the claim that Polygordius is the most primitive living archiannelid rests solely on the structure of its trochophore larva. It was this that formed the basis of Hatschek's (1878) trochophore theory and continued ac­ ceptance of this theory is the chief reason for regarding Polygordius as primitive, but it must b e remembered that the early success of the trochophore theory was in many ways a consequence of the widespread acceptance at that time of Haeckel's (1874) theory of recapitulation.

Clark more than a gratuitious assumption. A transitory metamerism of the nervous system and the mesodermal bands would represent almost con­ clusive evidence if it could b e convincingly established in either the Sipuncula or Echiura. This was claimed in the sipunculid Golfingia by Gerould (1907) but has been observed by no other investigator of sipun­ culids and Gerould subsequently withdrew his claim (Dawydoff, 1928; 1959; Hyman, 1959) so that it may b e dismissed. 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.

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.

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