|
Valve (mollusc)
A valve is each articulating part of the shell of a mollusc or another multi-shelled animal such as brachiopods and some crustaceans. Each part is known as a valve or in the case of chitons, a "plate". Members of two classes of molluscs, the Bivalvia (clams) and the Polyplacophora (chitons), have valves. Species within one family of very unusual small sea snails, marine opisthobranch gastropods in the family Juliidae, also have two articulating shells or valves, which resemble those of a bivalve. This exceptional family is commonly known as the bivalved gastropods. Gastropods in general are sometimes called "univalves", because in those that have a shell, the shell is usually in one part. Chitons The valves of chitons are eight dorsal, articulated shell plates, which are frequently coloured and sculpted. After death the girdle that holds the plates together disintegrates and the plates separate. Thus individual plates can be found washed up in beach drift, as shown in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiton Tuberculatus Plates
Chitons () are marine molluscs of varying size in the class Polyplacophora (), formerly known as Amphineura. About 940 extant and 430 fossil species are recognized. They are also sometimes known as gumboots or sea cradles or coat-of-mail shells or suck-rocks, or more formally as loricates, polyplacophorans, and occasionally as polyplacophores. Chitons have a shell composed of eight separate shell plates or valves. These plates overlap slightly at the front and back edges, and yet articulate well with one another. Because of this, the shell provides protection at the same time as permitting the chiton to flex upward when needed for locomotion over uneven surfaces, and even allows the animal to curl up into a ball when dislodged from rocks. The shell plates are encircled by a skirt known as a girdle. Habitat Chitons live worldwide, from cold waters through to the tropics. They live on hard surfaces, such as on or under rocks, or in rock crevices. Some species live quite hig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bivalve
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. The shipworms bore into wood, clay, or stone and live inside these substances. The shell of a bivalve is composed of calc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tamanovalva
''Berthelinia'' is a genus of gastropod belonging to the family Juliidae. MolluscaBase eds. (2021). MolluscaBase. Berthelinia Crosse, 1875. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=415113 on 2021-06-09 The genus has almost cosmopolitan distribution. Species: *'' Berthelinia australis'' *'' Berthelinia babai'' *'' Berthelinia caribbea'' *'' Berthelinia chloris'' *''Berthelinia corallensis'' *'' Berthelinia darwini'' *''Berthelinia elegans'' *'' Berthelinia fijiensis'' *'' Berthelinia ganapati'' *'' Berthelinia limax'' * † '' Berthelinia oligocaenica'' Janssen, 1979 Lozouet (P.) & Maestrati (P.), 2012 - Le contenu paléontologique. Mollusques. In : Lozouet (P.) Stratotype stampien, p. 239-297 *'' Berthelinia pseudochloris'' *'' Berthelinia rottnesti'' *'' Berthelinia schlumbergeri'' *''Berthelinia singaporensis'' *'' Berthelinia typica'' *''Berthelinia waltairensis ''Berthelinia waltairensis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edenttellina
''Berthelinia'' is a genus of gastropod belonging to the family Juliidae. MolluscaBase eds. (2021). MolluscaBase. Berthelinia Crosse, 1875. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=415113 on 2021-06-09 The genus has almost cosmopolitan distribution. Species: *'' Berthelinia australis'' *'' Berthelinia babai'' *'' Berthelinia caribbea'' *'' Berthelinia chloris'' *''Berthelinia corallensis'' *'' Berthelinia darwini'' *''Berthelinia elegans'' *'' Berthelinia fijiensis'' *'' Berthelinia ganapati'' *'' Berthelinia limax'' * † '' Berthelinia oligocaenica'' Janssen, 1979 Lozouet (P.) & Maestrati (P.), 2012 - Le contenu paléontologique. Mollusques. In : Lozouet (P.) Stratotype stampien, p. 239-297 *'' Berthelinia pseudochloris'' *'' Berthelinia rottnesti'' *'' Berthelinia schlumbergeri'' *''Berthelinia singaporensis'' *'' Berthelinia typica'' *''Berthelinia waltairensis ''Berthelinia waltairensis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midorigai
''Berthelinia'' is a genus of gastropod belonging to the family Juliidae. MolluscaBase eds. (2021). MolluscaBase. Berthelinia Crosse, 1875. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=415113 on 2021-06-09 The genus has almost cosmopolitan distribution. Species: *'' Berthelinia australis'' *'' Berthelinia babai'' *'' Berthelinia caribbea'' *'' Berthelinia chloris'' *''Berthelinia corallensis'' *'' Berthelinia darwini'' *''Berthelinia elegans'' *'' Berthelinia fijiensis'' *'' Berthelinia ganapati'' *'' Berthelinia limax'' * † '' Berthelinia oligocaenica'' Janssen, 1979 Lozouet (P.) & Maestrati (P.), 2012 - Le contenu paléontologique. Mollusques. In : Lozouet (P.) Stratotype stampien, p. 239-297 *'' Berthelinia pseudochloris'' *'' Berthelinia rottnesti'' *'' Berthelinia schlumbergeri'' *''Berthelinia singaporensis'' *'' Berthelinia typica'' *''Berthelinia waltairensis ''Berthelinia waltairensis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berthelinia
''Berthelinia'' is a genus of gastropod belonging to the family Juliidae. MolluscaBase eds. (2021). MolluscaBase. Berthelinia Crosse, 1875. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=415113 on 2021-06-09 The genus has almost cosmopolitan distribution. Species: *'' Berthelinia australis'' *'' Berthelinia babai'' *'' Berthelinia caribbea'' *'' Berthelinia chloris'' *''Berthelinia corallensis'' *'' Berthelinia darwini'' *''Berthelinia elegans'' *'' Berthelinia fijiensis'' *'' Berthelinia ganapati'' *'' Berthelinia limax'' * † '' Berthelinia oligocaenica'' Janssen, 1979 Lozouet (P.) & Maestrati (P.), 2012 - Le contenu paléontologique. Mollusques. In : Lozouet (P.) Stratotype stampien, p. 239-297 *'' Berthelinia pseudochloris'' *'' Berthelinia rottnesti'' *'' Berthelinia schlumbergeri'' *''Berthelinia singaporensis'' *'' Berthelinia typica'' *''Berthelinia waltairensis ''Berthelinia waltairensis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julia (genus)
Julia is a minute sea snails genus, marine gastropod mollusks or micromollusks in the superfamily Oxynooidea. ''Julia'' is the type genus of the family Juliidae. Description As Tryon (1884) Tryon G. W. Jr. (1884)''Structural and systematic conchology: an introduction to the study of the Mollusca. Volume III'' Philadelphia, published by the authorp. 267 wrote in his description of the genus ''Julia'': the shell is oblong, thick, and cordiform. The valves are closed, the margins entire and the valves are inequilateral. The lunule is deep circular, projecting into the interior of the right valve, the left valve is in the same place furnished with dentiform tubercles. The hinge line is simple and arched. The ligament is external and narrow. There are two muscle scars which are unequal and subcentral. These animals have two valves, and the soft parts can be completely withdrawn inside the shell. de Bruyne R. H. (2004). ''Encyklopedie ulit a lastur''. Rebo Productions, 336 pp., , ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacoglossa
Sacoglossa, commonly known as the sacoglossans or the "solar-powered sea slugs", are a superorder of small sea slugs and sea snails, marine gastropod mollusks that belong to the clade Heterobranchia. Sacoglossans live by ingesting the cellular contents of algae, hence they are sometimes called "sap-sucking sea slugs". Some sacoglossans simply digest the fluid which they suck from the algae, but in some other species, the slugs sequester and use within their own tissues living chloroplasts from the algae they eat, a very unusual phenomenon known as kleptoplasty, for the "stolen" plastids. This earns them the title of the "solar-powered sea slugs", and makes them unique among metazoan organisms, for otherwise kleptoplasty is known only among single-celled protists. The Sacoglossa are divided into two clades - the shelled families (Oxynoacea) and the shell-less families (Plakobranchacea). The four families of shelled species are: Cylindrobullidae, Volvatellidae, Oxynoidae, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod Shell
The gastropod shell is part of the body of a Gastropoda, gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the Aperture (mollusc), aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. Shell layers The gastropod shell has three major layers secreted by the Mantle (mollusc), mantle. The calcareous central layer, tracum, is typically made of calcium carbonate precipitated into an organic matrix known as c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusks
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species. The proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gastropods ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
