. Grundsätze der modernen Biologie. Biologie. 648-Vererbung und Evolution. Abb. 32-26. Eine Der sandworms (Neanlbes). Stamm Annelida; Klasse Polychaeta. Hinweis Die uno Gelenkwelle hautanhangsgebilde (parapodia) und die zahlreichen Borsten (setae). Links Muster, ventralen Aspekt; rechts Muster, dorsalen Aspekt. (Copyright, Allgemeine Biologi-schen Versorgung House, Inc.) Löwe in der Wirbeltiere, obwohl sehr (er Embryo, etwas verdeckt in der Erwachsenen klar sein; und es gibt eine gewisse Tendenz für die Segmente zu verschmolzen werden und auch modifiziert unter Arthropoda. Andere Annelid Features. Die anneliden waren unter den ersten, die ein

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. Principles of modern biology. Biology. 648 - Heredity and Evolution. Fig. 32-26. One of the sandworms (Neanlbes). Phylum Annelida; Class Polychaeta. Note the un- jointed appendages (parapodia) and the numerous bristles (setae). Left specimen, ventral aspect; right specimen, dorsal aspect. (Copyright, General Biologi- cal Supply House, Inc.) lion in the vertebrates, although very clear in (he embryo, may be somewhat obscured in the adult; and there is some tendency for the segments to become fused and modified even among Arthropoda. Other Annelid Features. The annelids were among the first animals to develop a well- defined closed circulatory system (p. 319). In such systems, the blood flows through a con- tinuous system of capillaries and larger ves- sels. The blood does not enter the tissue spaces or come into direct contact with the tissue cells. This efficient type of system, which is well adapted to the nutritive, re- spiratory, and excretory requirements of larger animals, reaches an apex of develop- ment in the vertebrate group, where a cen- tralized pump, or heart, is also present. In the annelids, pumping is achieved by a num- ber of pulsating muscular vessels, the aortic loops and dorsal blood vessel (Fig. 17-9). Hemoglobin usually serves as the respiratory pigment (p. 364) in the annelids. But the hemoglobin of the annelid is dissolved di- rectly in the plasma and is not carried by specialized red cells. Annelids do not possess jointed append- ages, such as are characteristic of arthropods and vertebrates. Among annelids, in fact, appendages are often absent; or they may be mere slender, chitinous bristles (called setae); or at best, they are short fleshy outgrowths (parapodia), usually bearing bristles (Fig. 32-26). Anterior sucker. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Mar

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