Results 281 to 290 of about 41,410 (309)
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Comments on the evolution of the Annelida
Hydrobiologia, 1984The structure of the male ducts and their relative positions are significant indicators of the fact that the Lumbriculidae do not represent the stem forms of the Oligochaeta, confirming the recently expressed opinion of Hrabě (1983). However, the same arguments provide the basis for the separation of Dorydrilus in the family Dorydrilidae.
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1975
Bilateria in which:- 1. A perivisceral coelom is characteristically present though it may be partly or wholly replaced by a perivisceral haemocoel. 2. There is no parenchyma, the organs usually being suspended in the coelom by folds of the coelomic epithelium. 3.
J. A. Wallwork, J. H. Elgood, J. E. Webb
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Bilateria in which:- 1. A perivisceral coelom is characteristically present though it may be partly or wholly replaced by a perivisceral haemocoel. 2. There is no parenchyma, the organs usually being suspended in the coelom by folds of the coelomic epithelium. 3.
J. A. Wallwork, J. H. Elgood, J. E. Webb
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Chaetae and chaetogenesis in polychaetes (Annelida)
Hydrobiologia, 2005Annelid chaetae are epidermal extracellular structures that are in general clearly visible from the exterior. Their structure is highly diverse, especially within the Polychaeta, and each species shows a specific pattern of chaetae. Chaetae have therefore gained immense significance for species determination, making them the best studied structures in ...
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Sense organs in polychaetes (Annelida)
Hydrobiologia, 2005Polychaetes possess a wide range of sensory structures. These form sense organs of several kinds, including the appendages of the head region (palps, antennae, tentacular cirri), the appendages of the trunk region and pygidium (parapodial and pygidial cirri), the nuchal organs, the dorsal organs, the lateral organs, the eyes, the photoreceptor-like ...
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1963
The true worms have soft, segmented bodies often more or less cylindrical in shape. The skin is covered by a layer of cuticle (a non-cellular substance secreted by the skin cells underneath), which is soft and is not made hard by the inclusion in it of other substances as is done in the Insects and Crustacea.
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The true worms have soft, segmented bodies often more or less cylindrical in shape. The skin is covered by a layer of cuticle (a non-cellular substance secreted by the skin cells underneath), which is soft and is not made hard by the inclusion in it of other substances as is done in the Insects and Crustacea.
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13 Stamm Annelida (Ringelwürmer) Annelida Ringelwürmer
2021Peter Deplazes +6 more
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Evolution of mitochondrial gene order in Annelida.
Molecular Phylogenetics and Evolution, 2016Anne Weigert +5 more
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