Download or read book Comprehensive Revision of a Worldwide Collection of Freshwater Sponges Porifera Spongillidae Classic Reprint written by J. T. Penney and published by Forgotten Books. This book was released on 2018-02-18 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Comprehensive Revision of a Worldwide Collection of Freshwater Sponges (Porifera, Spongillidae) In spite of the fact that serious scientific efforts in the taxonomic study of freshwater sponges were begun in the mid-19th century, and that a great number of subsequent investigators have contributed a massive amount of additional descriptive information, the taxonomy of this group has remained in a most chaotic state. Following Bowerbank's (1863) initial revision of all species of Spongilla, Gray (1867) was first to establish useful criteria for their generic differen tiation and to erect six new genera in addition to Spongilla Lamarck. Unfortunately, this system was criticized and its validity questioned by Carter (1881a), who claimed that Gray established his new genera without having seen Bowerbank's material upon which they were erected. Although fully unjustified in doing so, Carter (1881a) alto gether ignored Gray's existing generic names and devised his own system for the inclusion of Bowerbank's species and subsequently collected material. Thus it happened that Gray's well-established genera fell into complete obscurity for many decades, and Carter's system became firmly established, without being seriously challenged by any subsequent taxonomist. From the turn of this century, several attempts were made to revise comprehensively the status of the ever increasing numbers of species. After the publication of the first bibliography of all freshwater sponges by Weltner it was chiefly Annandale (1906 - 1919) who began to build the foundations to an improved and modernized knowledge of spongillid taxonomy. Annandale reestablished some of Gray's generic names, at least at a subgeneric level, and added a number of well-defined new genera to the conglomerate systems of Gray and Carter. Additional revisions were subsequently undertaken by Gee (1926 Schroder (1926 and Arndt (1923 to name just the most important contributors. Generic revisions were attempted by De Laubenfels (1936) and Jewell However, in spite of the fact that all these investigations have certainly helped to overcome a number of taxonomic difficulties, they seemed to have little effect on the stability of taxonomic nomenclature. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book COMPREHENSIVE REVISION OF A WORLDWIDE COLLECTION OF FRESHWATER SPONGES PORIFERA SPONGILLIDAE written by J. T. PENNEY and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Revision of a Worldwide Collection of Freshwater Sponges Porifera Spongillidae written by J. T. Penney and published by . This book was released on 1968 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Racek seems to have authored much of this work after the death of J. T. Penney and undertook a study and review of Penny's huge colleciton of material and unpublished data at the recommendation of B. Theodore Cole of the University of South Carolina. In view of the voluminous material available, Racek found it imperative to revise all true gemmule-producing species rather than elaborate Penny's outlined account of the Meyeninae and as a result of the study, demonstrated the fallacy of a subdivision of the family Spongillidae by using gemmosclere characteristics.
Download or read book Comprehensive Revision of a Worldwide Collection of Freshwater Sponges Porifera written by J. T. Penney and published by Trieste Publishing. This book was released on 2017-07-26 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trieste Publishing has a massive catalogue of classic book titles. Our aim is to provide readers with the highest quality reproductions of fiction and non-fiction literature that has stood the test of time. The many thousands of books in our collection have been sourced from libraries and private collections around the world.The titles that Trieste Publishing has chosen to be part of the collection have been scanned to simulate the original. Our readers see the books the same way that their first readers did decades or a hundred or more years ago. Books from that period are often spoiled by imperfections that did not exist in the original. Imperfections could be in the form of blurred text, photographs, or missing pages. It is highly unlikely that this would occur with one of our books. Our extensive quality control ensures that the readers of Trieste Publishing's books will be delighted with their purchase. Our staff has thoroughly reviewed every page of all the books in the collection, repairing, or if necessary, rejecting titles that are not of the highest quality. This process ensures that the reader of one of Trieste Publishing's titles receives a volume that faithfully reproduces the original, and to the maximum degree possible, gives them the experience of owning the original work.We pride ourselves on not only creating a pathway to an extensive reservoir of books of the finest quality, but also providing value to every one of our readers. Generally, Trieste books are purchased singly - on demand, however they may also be purchased in bulk. Readers interested in bulk purchases are invited to contact us directly to enquire about our tailored bulk rates.
Download or read book Comprehensive Revision of a Worlwide Collection of Freshwater Sponges written by James T. Penney and published by . This book was released on 1968 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive revision of a worldwide collection of freschwater sponges Porifera Spongillidae written by James Theophilus Penney and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fresh water Sponges Porifera Spongillidae of Colorado written by Ruth E. Williams and published by . This book was released on 1980 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freshwater Sponge Porifera written by Alvin R. Alexander and published by . This book was released on 1998 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Checklist of Indian Freshwater Sponges written by S. Khera and published by . This book was released on 1976 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution Ecology and Reproductive Cycles of Colorado Fresh Water Sponges porifera written by Ruth Elizabeth Williams and published by . This book was released on 1977 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biodiversity of Freshwater Sponges Porifera written by K. L. Evans and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Morphology and Distribution of Fresh water Sponges Porifera Spongillidae of Marquette County Michigan written by Susan E. Uecke and published by . This book was released on 1976 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Genetics of Freshwater Sponges porifera Spongillidae and Sisyridae insecta Neuroptera of the Upper Susquehanna River Basin written by Alyssa Rothfuss and published by . This book was released on 2017 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on the Freshwater Sponge Radiospongilla Sceptroides Haswell 1882 written by John Stanisic and published by . This book was released on 1976 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Taxonomy Distribution and Ecology of the Freshwater Sponges Porifera written by Anthony Ricciardi and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Specimens of freshwater bryozoans (Ectoprocta) and sponges (Porifera: Spongillidae), two of the most poorly known faunal groups in Canada, were obtained from various locations in Ontario, Quebec, New Brunswick, Nova Scotia, Prince Edward Island, and Newfoundland. A total of 14 species of bryozoans and 15 species of sponges were identified. In 31 cases, these species were recorded from a province for the first time. Species new to Canada include the bryozoans Lophopodella carteri, Plumatella orbisperma, and Pottsiella erecta, and the sponges Radiospongilla crateriformis, Spongilla aspinosa, and Trochospongilla horrida. The morphology, taxonomy, distribution, and ecology of each species are examined. Several taxonomic revisions are made. Eunapius mackayi and Plumatella orbisperma are redescribed. Spongilla heterosclerifera, considered an endangered species, is shown to be a species mixture. Taxonomic keys to Eastern Canadian species of freshwater bryozoans and sponges are presented. New limits of tolerance to pH, calcium and magnesium levels, and water temperature are established for several species." --
Download or read book Fresh Water Sponges written by Edward Potts and published by Forgotten Books. This book was released on 2016-09-09 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Fresh Water Sponges: A Monograph My design in the preparation of the present paper 'has been, primarily, to describe those genera and species, mostly North American, that have been discovered since the date of Mr. Carter's publication; next, to detail the results of a somewhat extended examination into the character and variations, in North America, of those species that have long been familiarly known in Europe; and thirdly, to make it valuable for reference as a Monograph, by adding brief technical descriptions of all other good species.158 proceedings OF the academy OF [1887. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Catalog of North American State and Regional Freshwater Sponge References written by Dreux J. Watermolen and published by . This book was released on 2008 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
