Fine structure of the tubes of Maldanidae (Annelida)статья
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Дата последнего поиска статьи во внешних источниках: 23 января 2018 г.
Аннотация:Most of the marine annelids are active builders. Terebellidae, Sabellidae, Oweniidae, Onuphidae, Maldanidae, and some other families make agglutinated constructions (mainly tubes) by fixing sediment particles with specific secret of their epithelial glands. Fine structure of the tubes of 6 species of Maldanidae from 5 genera (Nicomache minor, N. lumbricalis, Maldane sarsi, Praxillella praetermissa, Rhodine gracilior, Axiothella catenata) was examined by SEM. These species demonstrate different lifestyles. Nicomache. minor and N. lumbricalis inhabit massive hard tubes attached to stones. Other species live inside the sediment, but Rhodine build rigid organic tubes, while Praxillella, Axiothella and Maldane are characterized by slender sand or silty tubes easy for rebuilding and renovation. All tubes have similar basic structure. The inner layer of the tube (inner cylinder) is made of hardened organic lining secreted by the worm. The sediment patricles are fastened together by the filaments departing from the inner cylinder. In the genera studied (except Rhodine and Praxillella) the external tube surface is also covered with a layer of organic substance with adhered detritus particles (outer cylinder). All examined maldanid tubes have similar microstructure. Organic component of the tubes is a network of thin filaments. The filaments form a 3D network in agglutinated part of the tube and fabric-like linings in the inner and outer cylinders. Tubes of all studied Maldanidae taxa have common characteristics, which are important to taxonomy and could be used for identification of fossils.