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Topic: Mollusc


  
  Mollusc
The mollusc is a soft-bodied, usually shelled INVERTEBRATE belonging to one of the largest animal phyla (Mollusca) with some 100 000 living and about 35 000 FOSSIL species.
Molluscs are found on land and in salt and fresh water, and include SNAILS, ABALONE, CLAMS, MUSSELS, octopuses and squid.
Molluscs, because of their diverse and often beautiful shell shapes, accessibility, and importance as food and disease vectors, have played important cultural and economic roles in human history.
www.thecanadianencyclopedia.com /index.cfm?PgNm=TCE&ArticleId=A0005366   (313 words)

  
 mollusc - Hutchinson encyclopedia article about mollusc
Sea slugs are molluscs related to snails, with a reduced or absent shell.
The majority of molluscs are marine animals, but some live in fresh water, and a few live on land.
Every mollusc has a fold of skin, the mantle, which covers either the whole body or only the back, and secretes the chalky substance that forms the shell.
encyclopedia.farlex.com /mollusc   (508 words)

  
 Glossario perle
The molluscs used are the Pinctada maxima and the Pinctada margaritifera at the end of their reproductive cycle.
In molluscs it constitutes the inner (internal epithelium) and outer layers (external epithelium) of the mantle.
Or the introduction, in a freshwater pearl mollusc, of minute sections (form 20 to 60) of a fragment of the mantle of another mollusc, in the case of cultured pearls without nucleus.
www.voguegioiello.net /06per/perle/gloss/eindex.asp   (4856 words)

  
 Mollusc Dwelling Burrows   (Site not responding. Last check: 2007-10-22)
Molluscs are among the most successful and diverse creatures on the planet today.
The earliest molluscs are thought to have appeared around the Cambrian and have since diversified into 7 (or 8?) classes.
A common class of mollusc is the bivalve.
www.brookes.ac.uk /geology/sedstruc/molluscburrow/molluscs.htm   (464 words)

  
 Learn more about Mollusc in the online encyclopedia.   (Site not responding. Last check: 2007-10-22)
The molluscs or (American English only) mollusks are a large and diverse phylum of Animals, including a variety of familiar creatures, well-known for their decorative shells or as seafood.
These suggest a close relationship between the molluscs and various other protostomes, notably the Annelids.
Mollusc fossils are some of the best known and are found from the Cambrian onwards.
www.onlineencyclopedia.org /m/mo/mollusc.html   (384 words)

  
 Mollusc   (Site not responding. Last check: 2007-10-22)
Mollusc Molecular News Database of resources and research on mollusc RNA and DNA, including researchers, publications, PCR primers, and DNA amplification protocols.
Man and Mollusc An introduction to mollusks, with emphasis on their relationship with man.
Freshwater Molluscs Information for county residents, including map of mollusc habitat.
www.serebella.com /encyclopedia/article-Mollusc.html   (281 words)

  
 Mollusk vs Mollusc   (Site not responding. Last check: 2007-10-22)
Although "mollusk" and "mollusc" both date from the 1830s, "mollusc" is the rarer word at least into the 1870s.
Subsequently, "mollusc" increased in frequency in Great Britain, displacing "mollusk," and then propagated to other parts of the world as malacological traditions were established in South Africa, Australia and elsewhere.
Since "mollusc" is now (probably) more widespread and common globally than "mollusk," people have assumed that it was always the common form and that "mollusk" evolved from it in the United States.
www.blueseasonline.com /article-Mollusckque.htm   (1332 words)

  
 Mollusc showcase (gastropods)
Molluscs live in the sea, in fresh water and on land.
In the mouth, the molluscs usually have a radula, a tongue covered with razing teeth.
Bivalves have two shells, snails have a single shell which is spirally coiled, scaphopods have a single tube-formed shell, and shell-bearing cephalopods have a straight or planary spiral-shaped shell.
www.toyen.uio.no /palmus/galleri/montre/english/m_blotdyr2_e.htm   (546 words)

  
 Mollusc - the large food & drink encyclopedia
Mollusc - the large food & drink encyclopedia
The mollusks or molluscs are the large and diverse phylum Mollusca, which includes a variety of familiar creatures well-known for their decorative shells or as seafood.
These range from tiny snails and clams to the octopus and squid (which are considered the most intelligent invertebrates).
www.netmoon.com /recipes/encyclopedia/m/mollusc.html   (272 words)

  
 Occurrence of Mollusc Communities in a Lowland Dam Reservoir Colonized by Dreissena polymorpha (Pallas) (Sulejow ...
Occurrence of Mollusc Communities in a Lowland Dam Reservoir Colonized by Dreissena polymorpha (Pallas) (Sulejow Reservoir, Central Poland), University of Podlaise.
The work aimed at the analysis of the structure and abundance of mollusc communities and their connection with environmental factors, especially the influence of Dreissena polymorpha.
Molluscs were collected at 21 sampling stations within the Sulejow Reservoir in July 1999 and 2000 using Ekman-Birge's grab and bottom dredge.
www.sgnis.org /publicat/jurkkarn.htm   (186 words)

  
 Shell Classes   (Site not responding. Last check: 2007-10-22)
All of the shells above are inhabited by molluscs --invertebrate animals with an unsegmented body, that generally consists of a head, foot, visceral mass, and hanging flaps of the body wall that constitute the mantle.
The molluscs might well be considered the ultimate examples of "morphing," both in regard to details of their body plan and details of the shell, itself.
Most molluscs, and particularly the snails, have chemosensory organs for taste (the osphradium), organs for equilibrium orientation (the statocysts), and at least primitive eye spots.
nighthawk.tricity.wsu.edu /museum/ArcherdShellCollection/ShellClass.html   (856 words)

  
 "Information resources on the care and use of molluscs"
The sources of organic matter affecting the study area water column and benthic communities appeared to be terrigenous‑continental, autochthonous (phytoplankton) and anthropogenic inputs due mainly to fish‑farming and bivalve mollusc activities.
The aims of this integrated study were to test simple breeding methods for molluscs and fish, to apply these to the practices employed by local fishermen and to experiment with the use of a cage system requiring a low level of investment.
The conclusion of this study is that, growth and yield were unaffected by the season of seeding at the study site and that it is not commercially worthwhile to farm mussels more than 9 months, due to yield decrease.
www.nal.usda.gov /awic/pubs/molluscs/aquabivalves.htm   (13442 words)

  
 Mollusc Evolution and Origin
Flatworm relative proponents assert that molluscs are coelomate, but instead of being derived from the hydrostat of molluscs, have had the solid mesenchyme of flatworms undergo cavity formation as a means of providing sinuses for fluid transport.
If molluscs come from a flatworm ancestor, then they must acquire a through-gut and a means of distributing the foodstuffs to the rest of the body-thus a circulatory system of some type is a necessity.
The modified turbellarian theory suggests that annelids and molluscs were derived from a common stem with its root in the turbellarian taxon.
comenius.susqu.edu /bi/322/IZLecture30.htm   (7092 words)

  
 Shell loss in mollusc evolution
Instead, the slug-like body form of such molluscs may be an adaptation to a burrowing or swimming lifestyle, in which shell reduction is necessary for streamlining, and (in the case of pelagic forms) reducing the weight of the animal.
Many shell-less molluscs have adapted to their nakedness by evolving novel features that carry out the functions previously performed by the shell (or by organs in the mantle cavity underneath).
The global success of the molluscs must therefore be attributed both to their ability to grow a protective shell, and to their ability to lose that shell when circumstances demand.
www.andrewgray.com /essays/molluscs.htm   (1510 words)

  
 ninemsn Encarta - Search Results - Mollusc
Mollusc, common name for members of a phylum of soft-bodied invertebrate animals (Latin, mollus,“soft”), usually with a hard external shell.
Cone (mollusc), common name for certain carnivorous marine gastropodmolluscs.
Their shells have a regular conical form, with a narrow opening from...
au.encarta.msn.com /Mollusc.html   (79 words)

  
 A mollusc invades French waters   (Site not responding. Last check: 2007-10-22)
This mollusc spread very rapidly, it quickly reached the Loire, the Seine via the Marne/Rhine canal, the Moselle via the Rhine, the Rhône, the Garonne, the Adour and the Charente, etc. The populations of these molluscs are large : 100 to 200 individuals per square metre, sometimes many more.
To develop these molluscs have to find an environment where the conditions (nutrition and reproduction) are favourable.
The young molluscs secrete a thread of mucous which allows them to drift in open water, the turbulence created by boats and locks enables them to attach themselves to the hulls of vessels and they also attach themselves to the feet of birds which results in their being transported far from their place of origin.
www.sea-river-news.com /113_4_gb.php   (484 words)

  
 mollusc   (Site not responding. Last check: 2007-10-22)
Many large mollusc areas are located in central and southern Vietnam, such as Phan Thiet, Ham Tan and Tuy Phong districts in Binh Thuan, Ba Tri and Binh Dai...
Many large mollusc areas are concentrated in the central and southern provinces such as Binh Thuan (Phan Thiet, Ham Tan and Tuy Phong districts), Ben Tre (Ba...
While cultured pearls are formed by deliberately inserting an irritant into a mollusc, the most sought-after pearls are those that form naturally.
www.biometnews.com /environment/mollusc.html   (283 words)

  
 The Fishery Then & Now   (Site not responding. Last check: 2007-10-22)
The bluefin tuna can grow to 4.3 m and 680 kg, and is capable of obtaining speeds of up to 104 km/h.
pedal sinus: a mollusc's "foot", the pedal sinus fills with blood to help the mollusc to burrow and move.
visceral mass: the main body of a mollusc, attached to the dorsal valve, contains its vital organs such as the heart, intestine, and gonads.
collections.ic.gc.ca /peifisheries/biology/bio_mussel.asp   (185 words)

  
 Mollusc Introduction 2
Another important mollusc structure is the foot, which may be adapted for locomotion, for attachment to the substrate, for capture of food or for a combination of these tasks.
Many molluscs also possess a radula, which is a rasping organ used for scraping, tearing or drilling into prey.
Some molluscs do not have gills but exchange respiratory gases directly across the mantle surface or by having it modified into air-breathing lungs.
bioweb.uwlax.edu /zoolab/Table_of_Contents/Lab-5a/Mollusc_Introduction_2/mollusc_introduction_2.htm   (173 words)

  
 Canadian Biodiversity: Species: Molluscs
They soon diversified and now include some of the best-known invertebrates: clams, snails, slugs, squids and octopi are all molluscs.
Molluscs originally had shells, but many groups have now severely reduced or lost them, usually as they became more mobile.
One hundred and ten thousand species of molluscs exist today in seven classes: Cephalopoda (octopi, squids, nautilus and cuttlefish), Bivalvia (clams and mussels), Gastropoda (snails and slugs), Polyplacophora (chitons), Aplacophora, Monoplacophora, and Scaphopoda (tusk shells).
www.canadianbiodiversity.mcgill.ca /english/species/molluscs   (140 words)

  
 Mollusc: A General Proof-Development Shell for Sequent-Based Logics - Richards, Kraan, Smaill, Wiggins (ResearchIndex)   (Site not responding. Last check: 2007-10-22)
Conceptually, Mollusc may be thought of as a logic-independent successor to Oyster [Bundy et al 90].
However, where Oyster was tied to a variant of Martin-Lof type theory, Mollusc can be used with any sequent-based logic for which a suitable definition is provided.
Mollusc: A general proof-development shell for sequent-based logics.
citeseer.ist.psu.edu /richards94mollusc.html   (542 words)

  
 Site selection for mollusc culture
In the mollusc fishery sector the landings from aquaculture activities are high.
Over 2.8 million metric tons of molluscs were cultured in 1985 which accounted for over 65.5% of the year's total production (4,399,371 MT), obviously indicating the importance of aquaculture activities with regard to this resource group.
Marine molluscs are unable to function when removed from their water medium and long exposure periods usually lead to death.
www.fao.org /docrep/field/003/AB722E/AB722E00.htm   (5220 words)

  
 Mollusc Health and Disease Management
Mollusc production is one of the fastest growing segments the food production sector.
To address the issues and challenges surrounding mollusc health management in both farmed and wild populations, diagnosticians, scientific investigators, veterinarians and technicians require a solid understanding of the principles of mollusc disease recognition and management, practical diagnostic techniques, and up-to-date information for existing and emerging diseases.
This research aims to develop new strategies to combat mollusc diseases in wild and cultured stocks, as well as to improve the management of diseases in stocks held under endemic situations in open waters.
www.upei.ca /cai/mollusc-june05.htm   (778 words)

  
 Chuck Lydeard's Home Page   (Site not responding. Last check: 2007-10-22)
The mission of the Species Survival Commission (SSC) Mollusc Specialist Group (MSG) is to conserve biological diversity by developing and executing programs to study, save, restore, and manage wisely molluscan species and their habitats.
Molluscs are a diverse group of animals that includes snails, slugs, squids, clams, scallops, octopuses, chiton, aplacophorans, and tusk shells.
Molluscs are the second largest animal phylum with more than 90,000 known species and an estimated 150,000 - 200,000 living species.
bama.ua.edu /~clydeard/IUCN-SSC_html/index.htm   (214 words)

  
 Invertebrate Zoology - Molluscs - snails, clams, sea-slugs and relatives
Molluscs include chitons, clams, mussels, snails, nudibranchs (sea-slugs), tusk shells, octopus and squid.
The mollusc collection is one of the world's largest, covering all groups of Recent and Tertiary molluscs.
Many of the specimens are dry shells, but there is also a large collection of preserved molluscs.
www.amonline.net.au /invertebrates/mal   (277 words)

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