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Author: Yu Xu Publisher: ISBN: 9781776888320 Category : Languages : en Pages : 0
Book Description
"Abstract: Members of Chrysogorgia Duchassaing & Michelotti, 1864, known as golden corals, are distributed in the deep sea worldwide. Based on specimens obtained from the tropical western Pacific and an integrated morphological-molecular approach, we established a new genus Parachrysogorgia, which includes 13 species separated from Chrysogorgia, and described nine species of Chrysogorgia including three new species C. arboriformis sp. nov., C. cylindrata sp. nov. and C. tenuis sp. nov., and two new combinations of Parachrysogorgia. The genus differs from Chrysogorgia by possessing a bare, sclerite-free area at the base of each tentacle and eight distinct projections beneath tentacles. Chrysogorgia cylindrata sp. nov. is distinguished by a slender bottlebrush-shaped colony in adults, elongate and lobed scales in coenenchyme, and warty and thick sclerites near the polyp mouth area. Chrysogorgia arboriformis sp. nov. is characterized by a tree-shaped colony with a long unbranched stem, slender and thin scales usually with large warts in coenenchyme. Chrysogorgia tenuis sp. nov. can be separated by a broad bottlebrush-shaped colony, long interbranch distance, elongate scales with broad lobes in polyp body wall. In contrast to the intraspecific variation of colony form, branch internodes, branching sequence and polyps, the sclerite forms and arrangement in different parts can be viewed as the most important character to separate Chrysogorgia species. For convenient identification, we divided the Chrysogorgia species into 12 morphological groups and divided Parachrysogorgia into three groups based on their sclerite forms and arrangement. Keywords: Deep sea, morphology, phylogeny, seamount, taxonomy"--Page 3.
Author: Yu Xu Publisher: ISBN: 9781776888320 Category : Languages : en Pages : 0
Book Description
"Abstract: Members of Chrysogorgia Duchassaing & Michelotti, 1864, known as golden corals, are distributed in the deep sea worldwide. Based on specimens obtained from the tropical western Pacific and an integrated morphological-molecular approach, we established a new genus Parachrysogorgia, which includes 13 species separated from Chrysogorgia, and described nine species of Chrysogorgia including three new species C. arboriformis sp. nov., C. cylindrata sp. nov. and C. tenuis sp. nov., and two new combinations of Parachrysogorgia. The genus differs from Chrysogorgia by possessing a bare, sclerite-free area at the base of each tentacle and eight distinct projections beneath tentacles. Chrysogorgia cylindrata sp. nov. is distinguished by a slender bottlebrush-shaped colony in adults, elongate and lobed scales in coenenchyme, and warty and thick sclerites near the polyp mouth area. Chrysogorgia arboriformis sp. nov. is characterized by a tree-shaped colony with a long unbranched stem, slender and thin scales usually with large warts in coenenchyme. Chrysogorgia tenuis sp. nov. can be separated by a broad bottlebrush-shaped colony, long interbranch distance, elongate scales with broad lobes in polyp body wall. In contrast to the intraspecific variation of colony form, branch internodes, branching sequence and polyps, the sclerite forms and arrangement in different parts can be viewed as the most important character to separate Chrysogorgia species. For convenient identification, we divided the Chrysogorgia species into 12 morphological groups and divided Parachrysogorgia into three groups based on their sclerite forms and arrangement. Keywords: Deep sea, morphology, phylogeny, seamount, taxonomy"--Page 3.
Author: Stefano Goffredo Publisher: Springer ISBN: 3319313053 Category : Science Languages : en Pages : 842
Book Description
This volume presents a broad panorama of the current status of research of invertebrate animals considered belonging to the phylum Cnidaria, such as hydra, jellyfish, sea anemone, and coral. In this book the Cnidarians are traced from the Earth’s primordial oceans, to their response to the warming and acidifying oceans. Due to the role of corals in the carbon and calcium cycles, various aspects of cnidarian calcification are discussed. The relation of the Cnidaria with Mankind is approached, in accordance with the Editors’ philosophy of bridging the artificial schism between science, arts and Humanities. Cnidarians' encounters with humans result in a broad spectrum of medical emergencies that are reviewed. The final section of the volume is devoted to the role of Hydra and Medusa in mythology and art.
Author: Ghosh Ramvilas Publisher: ISBN: 9781776886807 Category : Languages : en Pages : 0
Book Description
"Abstract: The descriptive taxonomic records of a total of 226 gorgonian species (Octocorallia: Alcyonacea) from Indian seas and neighbouring areas were surveyed and critically reviewed with the main aim of providing a more reliable checklist. The published accounts comprise: species originally described from within the region: subsequent descriptive records of the taxa originally described from within the region; and subsequent descriptive records of species originally described from outside of the region. The reviews include an attempt to assess the validity of all subsequent descriptive records, although in numerous cases the species have been assessed as unrecognisable from their type descriptions. Numerous new binomial combinations, some tentative, have been proposed. The assessment of the validity of a species record is expressed as an "Opinion" with supporting justification. Of the 226 species, there are 111 that were originally described from locations outside of Indian waters and have subsequently been described and recorded as occurring in the region. Of these, there are 9 species where we were unable to decide if the records are valid or not, 94 were assessed as invalid, 5 as possibly valid and 3 were considered valid. The survey highlights four major problems regarding the reliability of some more recently published taxonomic records for the region: the use of 'predatory journals'; plagiarism; the use of manipulated imagery in more than one description; and taxonomic decision apparently based on expediency. Keywords: Marine biodiversity, Indian Ocean, Sri Lanka, Maldives, Western Myanmar, checklist, species, sea fans, octocorals"--Page 7.
Author: Buhl-Mortensen, Lene Publisher: Nordic Council of Ministers ISBN: 9289360860 Category : Nature Languages : en Pages : 146
Book Description
This report presents results from the NovasArc project that has collated data on the distribution of vulnerable marine ecosystems (VMEs) in Arctic and sub-Arctic waters. Eleven VMEs were identified, based on management goals for coral and sponge communities. Many of the vulnerable marine ecosystems (VMEs) in the study area has a wide distribution. Soft and hard bottom sponge aggregations, hard bottom gorgonians, sublittoral sea pen communities, and cauliflower corals are predicted to cover > 20% of the study area shallower than 1000 meters. Of the anthropogenic activities in the study area bottom trawling represents the main threat to the VMEs. The compilation of trawling activity in the study area shows that fisheries mainly occurs shallower than 1000 meters and that 50 to 60% of the seafloor is not targeted. However, 30% of the seafloor has experienced intermediate to very high fishing effort. In general, the VMEs shows a larger overlap with fishing when the risk analysis is based on areas with an optimal habitat suitability. Using this conservative threshold to model the distribution of VMEs the results indicate that most VMEs have experienced an intermediate to high level of fishing in less than 40% of their distribution area in the whole study area.
Author: Covadonga Orejas Publisher: Springer ISBN: 3319916084 Category : Nature Languages : en Pages : 569
Book Description
What do we know about Mediterranean Cold (Deep)-Water coral ecosystems? In this book, specialists offer answers and insights with a series of chapters and short papers about the paleoecology, biology, physiology and ecology of the corals and other organisms that comprise these ecosystems. Structured on a temporal axis—Past, Present and Future—the reviews and selected study cases cover the cold and deep coral habitats known to date in the Mediterranean Basin. This book illustrates and explains the deep Mediterranean coral habitats that might have originated similar thriving ecosystems in today’s Atlantic Ocean.
Author: André Freiwald Publisher: Springer Science & Business Media ISBN: 3540276734 Category : Science Languages : en Pages : 1242
Book Description
Cold-water coral ecosystems figure the formation of large seabed structures such as reefs and giant carbonate mounds; they represent unexplored paleo-environmental archives of earth history. Like their tropical cousins, cold-water coral ecosystems harbour rich species diversity. For this volume, key institutions in cold-water coral research have contributed 62 state-of-the-art articles on topics from geology and oceanography to biology and conservation, with some impressive underwater images.
Author: Yu Xu
Author: Yu Xu
Author: Stefano Goffredo
Author: Ghosh Ramvilas
Author: Frederick M. Bayer
Author: Buhl-Mortensen, Lene
Author: Covadonga Orejas
Author: André Freiwald
Author: Katharina Fabricius
Author: Charles Cleveland Nutting
Author: Elisabeth Deichmann