Download or read book The Marine Annelids of Oregon written by Olga Hartman and published by . This book was released on 1950 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by United States National Museum and published by . This book was released on 1963 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods for Collection and Analysis of Aquatic Biological and Microbiological Samples written by Phillip E. Greeson and published by . This book was released on 1977 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Techniques of Water resources Investigations of the United States Geological Survey written by and published by . This book was released on 1987 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of The Academy of Natural Sciences Vol 132 1980 written by and published by Academy of Natural Sciences. This book was released on with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Revision of Sternaspis Otto 1821 Polychaeta Sternaspidae written by Kelly Sendall and published by PenSoft Publishers LTD. This book was released on 2013-04-08 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The peanut-shaped sternaspid polychaetes have been known since 1760 when Plancus named them as Mentula cucurbitacea marina. Sternaspids are common and abundant in soft bottoms. Some authors suggested that only one species should be recognized, whereas others regard a few species very widely distributed and variable depths. Delineating species was problematic; the ventro-caudal shield was disregarded or barely used for identifying species. In this contribution the ventral shield is evaluated and its diagnostic potential is confirmed. The revision of Sternaspis is based upon type or topotype materials. Sternaspid body, introvert hooks and shield show three distinct patterns: two genera have 7 abdominal segments and tapered introvert hooks, and one genus has 8 abdominal segments and spatulate introvert hooks. The ventro-caudal shield has 3 different patterns: stiff with ribs, and sometimes concentric lines, stiff with feebly-defined ribs but no concentric lines, and soft with firmly adhered sediment particles. Sternaspis is restricted to include species with 7 abdominal segments, falcate introvert hooks, and stiff shields, often exhibiting radial ribs, concentric lines or both. Two new genera incorporate the remaining species: Caulleryaspis has falcate introvert hooks, 7 abdominal segments, and soft shields with sediment particles firmly adhered on them. Petersenaspis has spatulate introvert hooks, 8 abdominal segments, and stiff shields with poorly-defined ribs but no concentric line. The geographic range of most species is smaller than previously indicated. Keys to genera and to all species are also included.
Download or read book An Ecological Characterization of the Pacific Northwest Coastal Region written by and published by . This book was released on 1980 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Systematics and Diversity of Annelids written by Maria Capa and published by MDPI. This book was released on 2021-08-18 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Special Issue, we address the state of the art of the systematics of the main annelid groups and the improvements in the diversity they hold, with special emphasis on the latest discoveries in well-studied areas, expeditions to unsurveyed areas or environments, or the use of novel techniques that allow for the improvement of biodiversity knowledge. We are hoping that this Special Issue will provide a platform facilitating a review of current knowledge on the subject, identifying current research problems, as well as indicating directions and research trends for the future.
Download or read book Taxonomic Atlas of the Benthic Fauna of the Santa Maria Basin and Western Santa Barbara Channel The Annelidia part 2 polychaeta phyllodocida syllidae and scale bearing families amphinomida and eunicida written by Andrew L. Lissner and published by . This book was released on 1995 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pleistoannelida Sedentaria II written by Günter Purschke and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-02-24 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the second volume in a series of 4 volumes in the Handbook of Zoology series treating morphology, anatomy, reproduction, development, ecology, phylogeny, systematics and taxonomy of polychaetous Annelida. In this volume a comprehensive review of a few more derived higher taxa within Sedentaria are given, namely Sabellida, Opheliida/Capitellida as well as Hrabeiellidae. The former comprise annelids possessing a body divided into two more or less distinct regions or tagmata called thorax and abdomen. Here two groups of families are united, the spioniform and sabelliform polychaetes. Especially Spionidae and Sabellidae are speciose families within this group and represent two of the largest annelid families. These animals live in various types of burrows or tubes and all possess so-called feeding palps. In one group these appendages are differentiated as grooved feeding palps, whereas in the other they may form highly elaborated circular tentacular crowns comprising a number of radioles mostly giving off numerous filamentous pinnulae. Often additionally colourful, the latter are also received the common names "feather-duster worms", "flowers of the sea", "Christmas-tree worms". Opheliida/Capitellida including five families of truly worm-like annelids without appendages represents the contrary. Their members burrow in soft bottom substrates and may be classified as non-selective deposit feeders. Molecular phylogenetic analyses have shown that Echiura or spoon worms, formerly regarded to represent a separate phylum, are members of this group. Last not least Hrabeiellidae is one out of only two families of oligochaete-like terrestrial polychaetes and for this reason received strong scientific interest.
Download or read book Intertidal Invertebrates of the Central California Coast written by Sol Felty Light and published by Univ of California Press. This book was released on 1954 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies from the Stations of the Fisheries Research Board of Canada written by Fisheries Research Board of Canada and published by . This book was released on 1968 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ecology of Eelgrass Meadows in the Pacific Northwest written by Ronald C. Phillips and published by . This book was released on 1985 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reproduction and Development in Annelida written by T. J. Pandian and published by CRC Press. This book was released on 2019-01-30 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a concise informative elucidation of all aspects of reproduction and development in annelids covering from arenicola to tubifex. Annelids flourish between 4,900 m depth to 2,000 m altitude; some of them occur in unusual habitats like hydrothermal vents and subterranean aquatic system (stigobionts). A few have no gut and acquire adequate nutrients through osmotrophism and/or engaging symbiotic microbes. In the absence of exoskeleton to escape predation, the 17,000 speciose annelids have explored bewildering modes of reproduction; not surprisingly, 42–47% of them are brooders. With 13,000 species, polychaetes are gonochores but some 207 species of them are hermaphrodites. Clitellates are all hermaphrodites; of them, 76 species are parthenogens, of which 56 are earthworms. Regenerative potency of annelids ranges from an organ to an entire worm from a single ‘seminal’ segment. The head, tail and both together can be regenerated 21, 42 and 20 times, respectively. However, the potency is limited to ~1% of polychaetes and Heterogamatic sex determination is reported to occur only in six polychaete species, although karyotype is known for 83 annelid species. In temperate polychaetes, a dozen neuroendocrines, arising mostly from the ‘brain’ regulates reproductive cycle. A complete chapter devoted to vermiculture, (i) recognizes the fast-growing candidate species, (ii) distinguishes 'layers' from 'brooders', (iii) indicates that the harvest of oligochaetes may reduce the input of nitrogenous fertilizer in the ricefield, and (iv) explores the scope for increasing wealth from waste.
Download or read book EPA 670 4 written by and published by . This book was released on 1973-07 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Review and Taxonomic Revision of the Family Sabellariidae Johnston 1865 Annelida Polychaeta written by David W. Kirtley and published by . This book was released on 1994 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
