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Author: James Scott Bowerbank
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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Book Description
Author: James Scott Bowerbank
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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Book Description
Author: James Scott Bowerbank
Publisher:
ISBN:
Category : Sponges
Languages : en
Pages : 404
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 640
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 574
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Author: Jean Vacelet
Publisher: Springer Science & Business Media
ISBN: 3642708927
Category : Science
Languages : en
Pages : 331
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Book Description
Although sponges are one of the major components of littoral ecosystems, their systematics obviously lags behind that of the majority of other groups of marine invertebrates. Also the evolutionary trends in these most primitive of the Metazoans are poorly understood. The confused state of their taxonomy and the difficulties with their identification prevent their use in ecological studies. The emphasis of interest presently seems to have shifted towards chemistry, but many of the hundreds of interesting chemicals recently described in sponges pro bably have been found in mistakenly or imprecisely identified animals. This situ ation will become worse in the next few years, when a number of experts will retire and will not be replaced by new ones, owing to the difficulties that the science of systematics is facing in most countries - as exemplified during this meeting by an informal discussion on the endangered future of European Museums. Under these circumstances, it is the responsability of present sponge taxono mists to leave a less confused state and tools such as simple fauna or computerized data bases to generations following. These tools do not exist even in one of the best studied areas, the North-Eastern Atlantic (including the Mediterranean Sea).
Author: John N.A. Hooper
Publisher: Springer Science & Business Media
ISBN: 1461507472
Category : Science
Languages : en
Pages : 1779
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Book Description
Research whilst compiling this book has uncovered a fauna about twice the size as that previously published in the literature and consequently Systema Porifera revises and stabilizes the systematics of the phylum to accommodate this new knowledge in a contemporary framework. Practical tools (key illustrations, descriptions of character) are provided to facilitate the assignment of approximately 680 extant and 100 fossil genera. Systema Porifera is unique making sponge taxonomy widely available at the practical level of classification (genera, families, order). It is a taxonomic revision of sponges and spongiomorphis (such as sphinctozoans and archaeocyathans) based on re-evaluation of type materials and evidence. It is also a practical guide to sponge identification providing descriptions and illustrations of characters and interpretation of their importance to systematics. Systema Porifera addresses many long standing nomenclatural problems and provides a sound baseline for future debate on sponges and their place in time and space. Systema Porifera describes 3 classes, 7 subclasses, 24 orders, 127 families and 682 valid genera of extant sponges (with over 1600 nominal generic names and an additional 500 invalid names treated). Treatment of the fossil fauna is less comprehensive or critical, although 6 classes, 30 orders, 245 families and 998 fossil genera are mentioned. Keys to all recent and many fossil taxa are provided.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: British Museum. Department of Printed Books
Publisher:
ISBN:
Category : Associations, institutions, etc
Languages : en
Pages : 584
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Author: British Museum
Publisher:
ISBN:
Category :
Languages : en
Pages : 704
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Author: Queen's University of Belfast. Library
Publisher:
ISBN:
Category : College catalogs
Languages : en
Pages : 994
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