By Marcel Florkin
Chemical Zoology, quantity IV: Annelida, Echiura, and Sipuncula offers chemical info on zoological value of Annelida, Echiura, and Sipuncula. This booklet is equipped into thirteen chapters that take on the organic and biochemical features of those phyla.
The establishing bankruptcy describes the comparative anatomy, phylogeny, and class of Annelida, Echiura, and Sipuncula. The publication is going on discussing the organic elements of those phyla, together with meals and digestion; breathing and effort metabolism; oxygen delivery; and carbohydrate and nitrogen metabolism. This quantity additionally covers those organisms' composition of guanidine compounds and phosphagens, lipids, inorganic elements, 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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Extra info for Chemical Zoology. Annelida, Echiuria, And Sipuncula
As metameri cally segmented protostomatous worms with a patent coelom, the an nelids represent a homogeneous phylum clearly distinguished from all other phyla. On the single issue of metamerism there is a great and critical g a p between the Annelida and the Echiura and Sipuncula, and to redefine the Annelida to include nonsegmented worms would result in a very broad and heterogeneous group. Drawing boundaries between 1. SYSTEMATICS AND PHYLOGENY: ANNELIDA, ECHIURA, SIPUNCULA 21 higher taxa and defining them is inevitably in some degree arbitrary.
The worm was also regarded as primitively simple by Perrier ( 1 8 7 5 ) , Hatschek ( 1 8 7 8 ) , Fraipont ( 1 8 8 7 ) , Salensky (1907) and MacBride ( 1 9 1 4 ) , for somewhat different reasons, and the features of adult Polygordius which were particularly regarded as primitive are as follows (Hatschek, 1 8 7 8 ) : 1. Its lack of chaetae. 2. The esophagus remains confined to the head region, unlike that of polychaetes, in which it extends into the anterior body segments. The segments of Polygordius are therefore all completely homonymous.
The problem of arranging polychaete families in a phyletic series is obviously absurdly difficult and w e cannot b e confident that the situa tion in the Oligochaeta is much better. T h e preoccupation of oligochaete systematists with the genital system, almost to the exclusion of other characters, may well give the spurious impression that the interpretation of the phylogeny of this subclass is simple b y comparison with poly chaetes, but, as w e have already seen, it is not difficult to arrange existing animals in a phyletic series if only a single character is considered.