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 The Biology of the Recent Antarctic and Subantarctic Brachiopods written by Merrill White Foster and published by . This book was released on 1970 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brachiopods written by Paul Copper and published by Routledge. This book was released on 2018-02-02 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of conference papers presents information on the molecular genetics, biomineralization, growth and ecology of extant brachiopod stocks (extrapolated back to the Cambrian), and the shell microstructure, taphonomy, paleogeography, evolution, and taxonomy of fossil brachiopods.
Download or read book Geology and Paleontology of Seymour Island Antarctic Peninsula written by Rodney M. Feldmann and published by Geological Society of America. This book was released on 1988 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brachiopods written by Howard Brunton and published by CRC Press. This book was released on 2001-11-29 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growth history of a brachiopod is entombed in its shell, but research on fossil and living brachiopods has generated unanswered questions about these marine invertebrates. Several contributors to Brachiopods Past and Present comment on their differing structures and morphological detail. They use these as examples of ontogenetic and evolutionar
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on 1987-03 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Zealand Journal of Zoology written by and published by . This book was released on 1981 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Zealand Journal of Zoology written by and published by . This book was released on 1981 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on 1993-09 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Zealand Journal of Zoology written by and published by . This book was released on 1981 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Scleractinian Corals from James Ross Basin Antarctica written by Filkorn and published by American Geophysical Union. This book was released on 1994 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brachiopods Through Time written by D. I. MacKinnon and published by CRC Press. This book was released on 1991-06-01 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Brachiopods from the Southern Hemisphere and Cryptopora from Oregon recent written by Gustav Arthur Cooper and published by . This book was released on 1982 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Recent brachiopods described herein were collected during dredging operations of several research vessels: the United States R/V Eltanin (alias Islas Orcadas while on loan to Argentina) in Antarctica, in the subantarctic waters of the Atlantic around South Georgia and the South Sandwich Islands, and in the Scotia Sea; R/V Hero dredging in Antarctic waters; R/V Anton Bruun operating along the west coast of South America; the initial cruises of R/V Rafale and Thierry operating in the Gulf of Guinea off the coast of West Africa. Seventeen genera are described, including 19 species and 10 lots not identified as to species; Pelagodiscus atlanticus (King), Discinisca laevis (Sowerby), Discinisca species, Cryptopora hesperis, new species, the first report of this genus in the northern Pacific, Terebratulina kiiensis Dall and Pilsbry, Terebratulina species, Abyssothyris wyvillei (Davidson), A. cf. elongata Cooper, Abyssothyris? species, Liothyrella delsolari, new species, L. expansa, new species, L. fosteri, new species, L. georgiana Foster, L. hendleri, new species, L. notorcadensis (Jackson), L.? vema Cooper, Platidia species, Argyrotheca species, Megathiris species, Pantellaria monstruosa (Scacchi), Macandrevia americana Dall, Macandrevia species, Notorygmia species, Terebratella? species, Syntomaria curiosa, new genus and species, Dyscritosia secreta, new genus and species, Neothyris parva, new species. The loop development of the new genera is described and illustrated in detail. Most of the localities from which the specimens were taken add geographic and bathymetric information new for these genera.
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
