By Marcel Florkin
Chemical Zoology, quantity IV: Annelida, Echiura, and Sipuncula provides chemical info on zoological importance of Annelida, Echiura, and Sipuncula. This booklet is geared up into thirteen chapters that take on the organic and biochemical elements of those phyla.
The commencing bankruptcy describes the comparative anatomy, phylogeny, and class of Annelida, Echiura, and Sipuncula. The booklet is going on discussing the organic elements of those phyla, together with foodstuff 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 care for the expansion and improvement, luminescence, endocrines, and pharmacologic homes of Annelida, Echiura, and Sipuncula.
This booklet is a useful source for zoologists and biochemists.
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Additional resources for Chemical Zoology. Annelida, Echiuria, And Sipuncula
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. This is possible because when a worm is burrowing through the sub stratum all points of the body act successively as anchors or points d'appui ( G r a y and Lissmann, 1938), but when a leech is "looping," only the two ends of the body, the suckers, come in contact with the substratum and provide points d'appui ( G r a y et al, 1938).
This lack of confidence in conclusions that have been drawn about the most primitive oligochaete and polychaete families is reinforced by the fact that in almost all discussions of the subject, it has been assumed that the archiannelids are the most primitive annelids. A common feature of all these exercises in comparative phylogeny is the rather formalized manipulation of existing families so that their anatomical features can b e arranged in a tidy series, despite the fact that it is commonly acknowl edged that the modern annelids are the end product of a long and complicated evolutionary history and cannot, therefore, b e relied upon to yield valid information about the structure of their remote ancestors.
T h e parapodia of myzostomarians are at least superficially similar to those of polychaetes and are uniramous as in phyllodocids, syllids, and saccocirrids. Wheeler (1898) homologized the ventral cirrus of the myzostomarian parapodium with the polychaete neuropodium, but there is no supporting evidence for this beyond its similar position. 3. T h e lateral organs of myzostomarians are almost identical in their detailed structure to those occurring in many sedentary polychaetes. 4. T h e nervous system of myzostomarians shows a high degree of coalescence and fusion, particularly in Myzostomum, and the ventral nerve cord is very short, but in essence, it corresponds with a polychaete nervous system of five segments.