|
Parasagitta Elegans
''Parasagitta elegans'' is a small arrow worm in the family Sagittidae, previously named ''Sagitta elegans'' Morphology ''Parasagitta elegans'' (prev. ''Sagitta elegans''). Body of adult animal can grow up to 45 mm, is narrow, firm and opaque (this image: animal very see-through. Visible opaque animal needs better picture). Fins are separated, rounded, and completely rayed. Anterior fins beginning below the ventral ganglion. Alimentary diverticula present. Eyes with small, round pigment spot. Ovaries long and narrow. Seminal vesicles conical in shape, either exactly next to or very close to the tail fin, separated from posterior fins. For anatomy, reproduction, classification, and fossil record; see Chaetognatha Taxonomy Three subspecies are recognised - ''Sagitta elegans arctica'', ''Sagitta elegans baltica'' and ''Sagitta elegans elegans''. The subspecies are considered to vary in size depending on the temperature of the waters in which they develop, which could be an indi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaetognatha
The Chaetognatha or chaetognaths (meaning ''bristle-jaws'') are a phylum of predatory marine worms that are a major component of plankton worldwide. Commonly known as arrow worms, about 20% of the known Chaetognatha species are benthic, and can attach to algae and rocks. They are found in all marine waters, from surface tropical waters and shallow tide pools to the deep sea and polar regions. Most chaetognaths are transparent and are torpedo shaped, but some deep-sea species are orange. They range in size from . There are more than 120 modern species assigned to over 20 genera. Despite the limited diversity of species, the number of individuals is large. Arrow worms are usually considered a type of protostome that do not belong to either Ecdysozoa or Lophotrochozoa. Anatomy Chaetognaths are transparent or translucent dart-shaped animals covered by a cuticle. The body is divided into a distinct head, trunk, and tail. There are between four and fourteen hooked, grasping spin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sagittidae
Sagittidae is a family of sagittoideans in the order Aphragmophora. Genera *'' Aidanosagitta'' Tokioka & Pathansali, 1963Tokioka, T. & Pathansali, D. (1963). Another new chaetognath from Malay waters, with a proposal of grouping some species of ''Sagitta'' into subgenera. ''Publications of the Seto Marine Biological Laboratory'', 11(1), 119–123. *''Caecosagitta'' Tokioka, 1965Tokioka, T. (1965). The taxonomical outline of Chaetognatha. ''Publications of the Seto Marine Biological Laboratory'', 12(5), 335–357. *'' Decipisagitta'' Bieri, 1991Bieri, R. (1991). Systematics of the Chaetognatha. In Bone, Q., Kapp, H. & Pierrot-Bults, A. (Eds.), ''The Biology of Chaetognaths''. Oxford: Oxford University. *'' Ferosagitta'' Kassatkina, 1971Kassatkina, A. P. (1971). New neritic species of chaetognaths from Poseta Bay, Sea of Japan. ''Investigations of Marine Fauna, Fauna and Flora of Poseta Bay, Sea of Japan'', 8(16), 265–294. *'' Flaccisagitta'' Tokioka, 1965 *'' Mesosagitta'' Tokio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benthos
Benthos (), also known as benthon, is the community of organisms that live on, in, or near the bottom of a sea, river, lake, or stream, also known as the benthic zone.Benthos from the Census of Antarctic Marine Life website This community lives in or near marine or freshwater sedimentary environments, from tidal pools along the , out to the continental shelf, and then down to the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plankton
Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. Freshwater plankton are similar to marine plankton, but are found in the freshwaters of lakes and rivers. Plankton are usually thought of as inhabiting water, but there are also airborne versions, the aeroplankton, that live part of their lives drifting in the atmosphere. These include plant spores, pollen and wind-scattered seeds, as well as microorganisms swept into the air from terrestrial dust storms and oceanic plankton swept into the air by sea spray. Though m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic
The Arctic ( or ) is a polar region located at the northernmost part of Earth. The Arctic consists of the Arctic Ocean, adjacent seas, and parts of Canada ( Yukon, Northwest Territories, Nunavut), Danish Realm ( Greenland), Finland, Iceland, Norway, Russia ( Murmansk, Siberia, Nenets Okrug, Novaya Zemlya), Sweden and the United States ( Alaska). Land within the Arctic region has seasonally varying snow and ice cover, with predominantly treeless permafrost (permanently frozen underground ice) containing tundra. Arctic seas contain seasonal sea ice in many places. The Arctic region is a unique area among Earth's ecosystems. The cultures in the region and the Arctic indigenous peoples have adapted to its cold and extreme conditions. Life in the Arctic includes zooplankton and phytoplankton, fish and marine mammals, birds, land animals, plants and human societies. Arctic land is bordered by the subarctic. Definition and etymology The word Arctic comes from the Greek w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltic Sea
The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden and the North and Central European Plain. The sea stretches from 53°N to 66°N latitude and from 10°E to 30°E longitude. A marginal sea of the Atlantic, with limited water exchange between the two water bodies, the Baltic Sea drains through the Danish Straits into the Kattegat by way of the Øresund, Great Belt and Little Belt. It includes the Gulf of Bothnia, the Bay of Bothnia, the Gulf of Finland, the Gulf of Riga and the Bay of Gdańsk. The "Baltic Proper" is bordered on its northern edge, at latitude 60°N, by Åland and the Gulf of Bothnia, on its northeastern edge by the Gulf of Finland, on its eastern edge by the Gulf of Riga, and in the west by the Swedish part of the southern Scandinavian Peninsula. The Baltic Sea is connected by artificial waterways to the White Sea via the White Sea–Baltic Canal and to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planktology
Planktology is the study of plankton, various small drifting plants, animals and microorganisms that inhabit bodies of water. Planktology topics include primary production, energy flow and the carbon cycle. Plankton drive the "biological pump", a process by which the ocean ecosystem transports carbon from the surface euphotic zone to the ocean's depths. Such processes are vital to carbon dioxide sinks, one of several possibilities for countering global warming. Modern planktology includes behavioral aspects of drifting organisms, engaging modern ''in situ'' imaging devices. Some planktology projects allow the public to participate online, such as the Long-term Ecosystem Observatory. Notable planktologists * Karl Banse * Sayed ElSayed * Paul Falkowski * Gotthilf Hempel * Victor Hensen Christian Andreas Victor Hensen (10 February 1835 – 5 April 1924) was a German zoologist and marine biologist ( planktology). He coined the term '' plankton'' and laid the foundation for b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> Arctic")
