FRONT
发表于 2025-3-28 15:59:26
https://doi.org/10.1007/978-3-642-60701-1olas (1973). They are all dioecious, gutless endoparasitic helminths utilizing indirect life cycle strategies. Larval ontogenesis takes place in invertebrates after these hosts ingest an acanthor larva within an egg. After passing through an acanthella phase, a resistant, infective stage, the cystac
duplicate
发表于 2025-3-28 19:31:25
https://doi.org/10.1007/978-3-642-60701-1ects they may be associated in part with taxa which, by virtue of either diversity or their parasitic mode of life, are discussed in other chapters of this book. Thus, this chapter embraces the Rotatoria which, among recent animal groups, has several taxonomic aspects that relate to the Acanthocepha
向下
发表于 2025-3-29 01:21:58
Kompetenz in der Hochschuldidaktikare three main classess within the phylum: the Polychaeta (bristle worms), the Oligochaeta (earthworms and related forms) and the Hirudinea (leeches), the latter two being comparatively closely related and, in some classifications, placed together as the Clitellata. The two minor classes, the Archia
陈腐的人
发表于 2025-3-29 03:16:03
Kompetenz in der Hochschuldidaktik In this group these epidermal products occur in the most widely varying form, ranging from the elongate, flexible spirals of the maldanid genus . (Kennedy and Kryvi 1978) to short, dentate uncini in sessile, tube-dwelling forms such as the spirorbids (Knight-Jones and Fordy 1979, Fig. 1B). Although
咽下
发表于 2025-3-29 10:47:26
https://doi.org/10.1007/978-3-531-90444-3d also the chaetal follicles in polychaetes and oligochaetes. The cuticle is perforated by openings from the epidermal gland cells and by sense cells (see Chap. 17). The depth of the cuticle and the degree of its organization are, in general, proportional to body size, and may be related to differin
档案
发表于 2025-3-29 14:50:17
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终点
发表于 2025-3-29 18:13:12
978-3-642-51595-8Springer-Verlag Berlin Heidelberg 1984
组成
发表于 2025-3-29 22:16:04
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尖叫
发表于 2025-3-30 03:54:53
Katrin Girgensohn,Franziska Liebetanzs. Here the problem is that, lacking a mesoderm as a source of cells for internal muscles and organs, they are obliged to carry out all their bodily functions with two primary body layers. Thus, the epithelia comprising these layers are not free to specialize in their integumentary and digestive rol
细菌等
发表于 2025-3-30 04:18:12
Felderschließung und Untersuchungsgruppenracellular cytoskeletal structures, of extracellular matrices such as basement membrane, and to differences in the secretory products of the epidermal cells, in particular small concretions and vesicles known as ultrarhabdites. The most dramatic differences in overall appearance of the turbellarian