Download or read book A Discussion of the Sponga Fauna of the Dry Tortugas in Particular and the West Indies in General with Material for a Revision of the Families and Orders of the Porifera written by M. W. de Laubenfels and published by . This book was released on 1936 with total page 225 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 with Material for a Rev of the Fam and Ord of the Porifera written by Max Walker De Laubenfels and published by . This book was released on 1936 with total page 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 Carnegie Institution of Washington. Tortugas Laboratory and published by . This book was released on 1908 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Discussion of the Sponge Fauna of the Dry Tortugas written by M. W. de Laubenfels and published by . This book was released on 1936 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Paper written by Carnegie Institution of Washington. Department of Marine Biology and published by . This book was released on 1908 with total page 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 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Papers from the Tortugas Laboratory of the Carnegie Institution of Washington written by and published by . This book was released on 1908 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fishery Bulletin of the Fish and Wildlife Service written by and published by . This book was released on 1954 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fishery Bulletin of the written by and published by . This book was released on 1954 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gulf of Mexico Its Origin Waters and Marine Life written by Paul Simon Galtsoff and published by . This book was released on 1954 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Cell Biology of Sponges written by T.L. Simpson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modem biology owes much to the study of favorable model systems which fa cilitates the realization of critical experiments and results in the introduction of new concepts. Examples of such systems are numerous and studies of them are regularly recognized by the scientific community. The 1983 Nobel Prize in Med icine and Physiology is a magnificent example in which com plants served as the experimental model. In a manner somewhat more modest, other biological systems have attracted recognition due to their critical phylogenetic position, or indeed because of their uniqueness which distinguishes them from all other organisms. Assuredly, among the whole assemblage ofliving organisms, sponges stand out as worthy of interest by scientists: they are simultaneously models, an important group in evolution, and animals unlike others. As early as the beginning of this century, sponges appeared as exceptional models for the study of phenomena of cell recognition. Innumerable works have been dedicated to understanding the mechanisms which assure the reaggregation of dissociated cells and the reconstitution of a functional individual. Today, re search on these phenomena is at the ultimate, molecular level. Through an as semblage of characteristics the sponges are, based upon all available evidence, the most primitive Metazoans. Their tissues-perhaps one can say their cell groups-are loosely assembled (they possess no tight or gap junctions), cell dif ferentiation appears highly labile, and they do not develop any true organs. But, they are most certainly Metazoans.

Download or read book Treatise on Marine Ecology and Paleoecology written by Joel W. Iledgpeth and Harry S. Ladd and published by Geological Society of America. This book was released on 1957 with total page 2468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fossil and Recent Sponges written by Joachim Reitner and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fossil and Recent Sponges contains articles on taxonomic, phylogenetic and ecological aspects of sponges of both biological and paleontological interest. They focus on three main topics: phylogeny and systematics, biology, and paleoecology of sponges. The reader is offered an overview over the most important aspects of current sponge research: - establishment of a new taxonomy based on mono phyletic groups (phylogenetic systematics) including recent and fossil taxa - new concepts of the biomineralisation of sponge skeletons - palaeoenvironmental analysis of fossil sponge buildups.

Download or read book Special Scientific Report written by and published by . This book was released on 1965 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 New Zealand Journal of Zoology written by and published by . This book was released on 1980 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aspects of Sponge Biology written by Frederick Harrison and published by Elsevier. This book was released on 2012-12-02 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aspects of Sponge Biology is the result of a symposium about sponge biology held in Albany, New York in May 1975. The symposium not only presents investigations, but also problem areas in the field of sponge biology. This book therefore shows that sponges are a very challenging and untouched subject area for future studies. This book is divided into three major parts, wherein the first part introduces and discusses sponge biology. The introduction and discussion include sponge biology principles, perspectives, and problems. The next two parts discuss cell and development biology, taxonomy, and ecology. Part 2 deals with several topics of the cellular aspect, including an analysis of reproduction in sponge populations and cytochemical studies of connective tissues in sponges. This part also looks into the cytological abnormalities in various normal and transformed cell lines. Part 3 describes the different types of sponge in their various habitats. Sponge feeding mechanisms, ecological factors controlling sponge distribution, and zoogeography of Brazilian marine Demospongiae are also discussed in this part. This book will be of important value to biology students and teachers. Specialists including zoologists, ecologists, comparative physiologists, and biologists will also benefit from this book.