Download or read book Report on Mollusca and Brachiopoda Dredged in Deep Water Chiefly Near the Hawaiian Islands with Illustrations from Hitherto Unfigured Species from Northwest America written by William Healey Dall and published by . This book was released on 1895 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biology of the Pacific Ocean Zenkevoch L A The deep sea bottom fauna Pleuston written by and published by . This book was released on 1969 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Antarctic and Subantarctic Brachiopods written by Merrill W. Foster and published by American Geophysical Union. This book was released on 1974 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 21. The Recent brachiopod faunas from southernmost South America, Antarctica, and the Subantarctic consisting of 21 genera and 37 species are described from new material. New taxa include the genera Manithyris and Bathynanus. Also new are 11 species: Compsothyris ballenyi, Hispanirhynchia? chiliensis, Manithyris rossi, Liothyrella multiporosa, Liothyrella scotti, Bathynanus tenuicostatus, Eucalathis macrorhynchus, Amphithyris hallettensis, Dallina eltanini, Fallax antarcticus, and Magellania? spinosa. Factor analysis was used to study relationships among morphological characters and environmental parameters. In Liothyrella, negative associations were found between beak height and water depth. The size of the pedicle opening within this genus is associated with the width of the hinge plate and the loop; apparently, these associations are related to increased dorsal adjustor muscle size with increased pedicle size. Similar relationships are found in the terebratellids, although here all of the characters are also negatively associated with water depth. Characters negatively associated with water depth may relate to the differing current strength at various depths. Puncta density is positively correlated with water temperature. Examples of brachiopod variation are discussed. Synonyms have resulted from former failure to study large samples and to appreciate the extent of brachiopod variation. A priori valuation of certain characters as being specific is unwarranted, since sibling species may be more similar than different subspecies of the same species. Many Recent and fossil brachiopod genera are too narrow in definition owing to oversplitting or to a narrow conception of monophyly. I advocate somewhat broader and more practical genera for obtaining the maximal information value from such taxa. Brachiopods, contrary to popular belief, are an abundant and viable group in the southern hemisphere faunas. Most brachiopods in the Ross Sea appear to have definite niches and habitats but may overlap geographically where population densities are low. Brachiopods here can be divided roughly into a slope and a shelf assemblage. The greatest species diversity occurs at the seaward edge of the Ross Sea shelf, interpreted as an ecotone effect where two different water types meet. Only South America and Antarctica appear to have or have had direct communication between some elements of their brachiopod faunas. Other similarities between separate southern continents are related to retention of common pre-Cenozoic elements or to chance dispersal of larvae across barriers. Events related to cooling during the late Pliocene or Pleistocene caused reduction of puncta density, shell thickness, and spiculation in the Recent fauna and apparently influenced the present species structure, at least in Liothyrella uva, Gyrothyris mawsoni, and Macandrevia.
Download or read book Report Upon the Condition and Progress of the U S National Museum During the Year Ending June 30 written by United States National Museum and published by . This book was released on 1898 with total page 1918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on the Progress and Condition of the U S National Museum for the Year Ending June 30 written by United States National Museum and published by . This book was released on 1897 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report written by United States National Museum and published by . This book was released on 1898 with total page 1630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of the National Museum written by United States National Museum and published by . This book was released on 1898 with total page 1646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report of the Board of Regents of the Smithsonian Institution written by Smithsonian Institution. Board of Regents and published by . This book was released on 1898 with total page 1626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report of the Board of Regents of the Smithsonian Institution written by Smithsonian Institution and published by . This book was released on 1898 with total page 1628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports for 1884-1886/87 issued in 2 pts., pt. 2 being the Report of the National Museum.
Download or read book Annual Report of the Board of Regents of the Smithsonian Institution Showing the Operations Expenditures and Condition of the Institution for the Year Ending June 30 1896 written by Smithsonian Institution. Board of Regents and published by . This book was released on 1898 with total page 1626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report of the Board of Regents of the Smithsonian Institution written by United States National Museum and published by . This book was released on 1898 with total page 1630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Professional Paper written by and published by . This book was released on 1938 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Memoirs of the California Academy of Sciences written by and published by . This book was released on 1903 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions to Biology from the Hopkins Seaside Laboratory written by and published by . This book was released on 1903 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions to Biology from the Hopkins Seaside Laboratory written by Hopkins Marine Station and published by . This book was released on 1903 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions to Biology written by Hopkins Marine Station and published by . This book was released on 1903 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprints from various scientific periodicals.
Download or read book The Paleontology and Stratigraphy of the Marine Pliocene and Pleistocene of San Pedro California written by Ralph Arnold and published by . This book was released on 1903 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
