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David A. Wharton's A Functional Biology of Nematodes PDF

By David A. Wharton

ISBN-10: 1461585163

ISBN-13: 9781461585169

ISBN-10: 146158518X

ISBN-13: 9781461585183

General Editor: Peter Calow, division of Zoology, college of Sheffield, England the most goal of this sequence can be to demonstrate and to provide an explanation for the way in which organisms 'make a dwelling' in nature. on the middle of this - their sensible biology - is the way in which organisms gather after which utilize assets in metabolism, circulation, development, copy, etc. those procedures will shape the elemental framework of all of the books within the sequence. each one booklet will be aware of a specific taxon (species, kin, classification or perhaps phylum) and may assemble details at the shape, body structure, ecology and evolutionary biology of the crowd. the purpose may be not just to explain how organisms paintings, but in addition to contemplate why they've got come to paintings in that approach. through focusing on taxa that are renowned, it truly is was hoping that the sequence won't simply illustrate the luck of choice, but in addition express the restrictions imposed upon it through the physiological, morpho­ logical and developmentallimhations of the teams. one other vital function of the sequence should be its organismic orientation. every one ebook will emphasise the significance of sensible integration within the daily lives and the evolution of organisms. this is often the most important given that, even though it can be precise that organisms may be regarded as collections of gene-determined characteristics, they neverthe­ much less engage with their atmosphere as built-in wholes and it really is during this context that exact qualities were subjected to normal choice and feature evolved.

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Extra resources for A Functional Biology of Nematodes

Sample text

There is a marked difference between the ultrastructure of the body cuticle and of that lining the oesophagus. This allows us to distinguish between the stoma (the region posterior to the oral opening which is lined by body cuticle) and the rest of the buccal capsule (which is lined by oesophageal cuticle). Some species do not have any body cuticle associated with the buccal capsule and, therefore, lack a stoma (they are astomatous). The cuticle lining the buccal capsule may be modified as plates or teeth which are used by animal parasitic nematodes for attachment, or to abrade tissue prior to ingestion.

Other Sense Organs These include the deirids which are situated on either side of the body posterior to the nerve ring, body pores in dorylaimid nematodes and elongate body setae of freshwater and marine nematodes. In addition there are a number of internal receptors which do not have a cuticular component. These include dendrites Movement and Co-ordination 49 in the mouth, oesophagus, intestinal-rectal valve and in the body wall (Wright, 1980). Some of these may have a proprioceptive function.

The neuronal component consists of one or more sensory processes of the sensory neurons. A highly modified cilium connects with the end of the sensory dendrite. Wright (1980) prefers to call this a dendritic process rather than a cilium, as its structure is often very different from that of motile cilia or even some sensory cilia in other animals. The dendritic process contains microtubules which may be grouped into a circle of doublets. The dendritic process is overlain by cuticle or, in chemoreceptors, by a cuticle-lined pore.

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A Functional Biology of Nematodes by David A. Wharton


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