Download or read book Skeletons in confusion a review of astrophorid sponges with dicho calthrops as structural megascleres Porifera Demospongiae Astrophorida written by Rob van Soest and published by PenSoft Publishers LTD. This book was released on 2010-11-16 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sponges usually obtain their distinct shape and structure by arrangement of mineral or organic skeletal elements (spicules, ?bers). A small group, although provided with spicules, nevertheless is incapable of developing recognizable shapes because the type of structural spicules they have (equal-length four-rayed siliceous elements called calthrops) preclude the possibility of building a cohesive skeleton. Such sponges insinuate themselves in crevices and holes, diminishing the chance of their discovery and collection. The study addresses the taxonomy and biodiversity of two globally distributed genera of these sponges, Dercitus and Calthropella, including the description of ten new species (of 38 species so far documented). The two genera appear similar in spiculation, but they differ in the types of small spicules (microscleres). This induces a discussion of their phylogeny and classi? cation: are they closely related or is it convergent evolution? No proposals are made for a rearranged classi? cation pending independent evidence from molecular studies.
Download or read book Climate Change Ocean Acidification and Sponges written by José Luis Carballo and published by Springer. This book was released on 2017-10-27 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: While sponges represent a very simple group of organisms, which are represented by over 8000 species, there is considerable interest in the increasing role they may play in future marine ecosystems. While we still have a comparatively limited understanding of how sponges will respond to ocean warming and acidification there is evidence that some species may have the ability to acclimate or even adapt to these stressors. This comprehensive collection of articles describes our current understanding of the impacts of ocean acidification and warming on sponges across multiple levels of biological organisation, and from the geological past to the present. With expert contributions from across the world this book represents the most up-to-date view on sponge responses to climate change. This book will be of interest to a wide audience of marine scientists and managers, who are grappling with how to manage, conserve and protect marine ecosystems.
Download or read book Systema Porifera written by John N.A. Hooper and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1779 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Species Diversity of Animals in Japan written by Masaharu Motokawa and published by Springer. This book was released on 2016-11-26 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the status quo of the knowledge about the biodiversity in terrestrial, freshwater, and marine animals that live in Japan. Consisting of some 6,800 islands that are arrayed for approximately 3,500 km from north to south, the Japanese archipelago has a complex history in a paleogeographic formation process over time and harbors rich flora and fauna. This work will contribute to establishing a general biogeographic theory in archipelagoes around continental shelves. Facing the ongoing extinction crisis, one of the most important tasks for our generation is to bequeath this precious natural heritage to future generations. As the first step toward this goal, a species list has been compiled through solid, steady alpha-taxonomic work in each taxon. Furthermore, the phylogeography and population genetic structure for each species is elucidated for deeper understanding of the local fauna, the scientific results of which should be the basis for establishing conservation policies and strategies. Also the problem of alien or introduced species is investigated as another threat to the native fauna.Each of the 27 chapters is written by the most active specialist leading the field, thus readers can acquire up-to-date knowledge of the animal species diversity and their formation process of Japanese animals in the most comprehensive form available. This book is recommended for researchers and students who are interested in species diversity, biogeography, and phylogeography.
Download or read book A Monograph of the British Spongiad written by James Scott Bowerbank and published by . This book was released on 1866 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Porifera Research written by Márcio Reis Custódio and published by . This book was released on 2007 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diversity of Sponges Porifera from Cryptic Habitats on the Belize Barrier Reef Near Carrie Bow Cay written by Klaus Rützler and published by . This book was released on 2014 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Revision of Axinellidae Porifera Demospongiae of the Central West Atlantic Region written by Belinda Alvarez and published by . This book was released on 1998 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sponge Sciences written by Yoko Watanabe and published by . This book was released on 1998 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sponge has attracted attention as one of the first animals to evolve multicellular organization. The sponge also interests scientists because it provides excellent research material in molecular phylogeny, allowing the process of animal diversification to be probed at the molecular level. Additionally, researchers have discovered in sponges certain bioactive substances with unique antibacterial and anticancer properties of great interest in medical and pharmaceutical science. Sponge Sciences presents the most up-to-date information on all areas of sponge research, with emphasis on taxonomy, molecular evolution, developmental biology, and natural products chemistry, as well as the biology of freshwater sponges. It also provides new findings in the morphology, cell biology, physiology, ecology, and biogeography of sponges. The papers compiled here are contributed by world-renowned sponge scientists.
Download or read book Marine Fauna and Flora of Bermuda written by Wolfgang E. Sterrer and published by Wiley-Interscience. This book was released on 1986-01-17 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the entire range of marine species, from plankton to marine mammals, here is the first field guide devoted to a subtropical marine ecosystem, the Bermuda coastal waters. With 2,600 black and white illustrations, 2l2 color photographs, and over 900 references.
Download or read book Sponges of Beaufort N C Harbor and Vicinity written by Wesley Critz George and published by . This book was released on 1919 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Discussion of the Sponge Fauna of the Dry Tortugas in Particular and the West Indies in General written by Max Walker De Laubenfels and published by . This book was released on 1936 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bredin Archbold Smithsonian Biological Survey of Dominica Burrowing Sponges Genus Siphonodictyon Bergquist from the Caribbean written by Klaus Rützler and published by . This book was released on 1971 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sponges Collected on the Presidential Cruise of 1938 written by Max Walker De Laubenfels and published by . This book was released on 1939 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Guide to Sponges of Singapore written by Swee Cheng Lim and published by . This book was released on 2008 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Identification of Coral Reef Sponges written by E. R. Gammill and published by . This book was released on 1997 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Sponges from the Puerto Rican Deep written by Max Walker De Laubenfels and published by . This book was released on 1934 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
