By Marcel Florkin
Chemical Zoology, quantity IV: Annelida, Echiura, and Sipuncula provides chemical details on zoological value of Annelida, Echiura, and Sipuncula. This ebook is geared up into thirteen chapters that take on the organic and biochemical points of those phyla.
The starting bankruptcy describes the comparative anatomy, phylogeny, and category of Annelida, Echiura, and Sipuncula. The e-book is going on discussing the organic points 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 take care of the expansion and improvement, luminescence, endocrines, and pharmacologic houses of Annelida, Echiura, and Sipuncula.
This publication is a useful source for zoologists and biochemists.
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Additional info for Chemical Zoology. Annelida, Echiuria, And Sipuncula
This fundamental body archi tecture and the locomotory technique it implies has been retained by oligochaetes; only their adaptations to life in freshwater and terrestrial environments are new developments. Polychaetes have evolved a radi cally different structure but as they have remained primarily marine the reproductive and excretory systems have not been subject to such acute specialization as in the oligochaetes. , Capitellidae, Arabellidae, Lumbrinereidae) have done so incompletely. Their parapodia and extrinsic parapodial musculature, although reduced, is still present and the longitudinal and circular muscle layers, although more extensive than those of typically errant polychaetes such as nereids, do not form complete coats.
Once the princi ple is admitted that secondary reduction has been an important feature of archiannelid evolution, the position of Polygordius itself becomes insecure. , 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.
In the same way, the evolution of the carnivorous habit with its asso ciated anatomical specializations, is not uncommon in oligochaetes. T h e naidids Chaetogaster and Ophidonais feed on small crustaceans and other worms (Stephenson, 1930) and several other naidids are scaven gers. Enchytraeus albidus is a carrion eater (Michaelsen, 1927) and Lumbricillus has been found feeding on a d e a d seal (Stephenson, 1922b). T h e gut contents of Limnodrilus heterochaetus suggest a car nivorous diet (Michaelsen, 1927).