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Fusitriton Oregonensis
''Fusitriton oregonensis'' (Oregon hairy triton) is a species of large predatory sea snail, a marine gastropod mollusk in the family Cymatiidae. The snail was given its specific name ''oregonensis'' (meaning "of Oregon") to honor the Oregon Territory by conchologist John Howard Redfield in 1846. It was declared the state seashell of Oregon in 1989 by the 65th Legislative Assembly.Chapter 186 — State Emblems; State Boundary 2017 Oregon Revised Statutes Distribution The Oregon hairy triton is native to the northwestern coast of |
Operculum (gastropod)
The operculum (; ) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails; the structure is found in some marine and freshwater gastropods, and in a minority of terrestrial gastropods, including the families Helicinidae, Cyclophoridae, Aciculidae, Maizaniidae, Pomatiidae, etc. The operculum is attached to the upper surface of the foot and in its most complete state, it serves as a sort of "trapdoor" to close the aperture of the shell when the soft parts of the animal are retracted. The shape of the operculum varies greatly from one family of gastropods to another. It is fairly often circular, or more or less oval in shape. In species where the operculum fits snugly, its outline corresponds exactly to the shape of the aperture of the shell and it serves to seal the entrance of the shell. Many families have opercula that are reduced in size, and which a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territories of the United States by population, most populous U.S. state and the List of U.S. states and territories by area, 3rd largest by area. It is also the most populated Administrative division, subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous Statistical area (United States), urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento, California, Sacramento is the state's capital, while Los Angeles is the List of largest California cities by population, most populous city in the state and the List of United States cities by population, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Senescence
Senescence () or biological aging is the gradual deterioration of functional characteristics in living organisms. The word ''senescence'' can refer to either cellular senescence or to senescence of the whole organism. Organismal senescence involves an increase in death rates and/or a decrease in fecundity with increasing age, at least in the latter part of an organism's life cycle. Senescence is the inevitable fate of almost all multicellular organisms with germ-soma separation, but it can be delayed. The discovery, in 1934, that calorie restriction can extend lifespan by 50% in rats, and the existence of species having negligible senescence and potentially immortal organisms such as '' Hydra'', have motivated research into delaying senescence and thus age-related diseases. Rare human mutations can cause accelerated aging diseases. Environmental factors may affect aging – for example, overexposure to ultraviolet radiation accelerates skin aging. Different parts of the body ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Urchin
Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of sea urchins are round and spiny, ranging in diameter from . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals. Sea urchins are also used as food especially in Japan. Adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to the pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascidiacea
Ascidiacea, commonly known as the ascidians, tunicates (in part), and sea squirts (in part), is a polyphyletic class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of a polysaccharide. Ascidians are found all over the world, usually in shallow water with salinities over 2.5%. While members of the Thaliacea and Larvacea (Appendicularia) swim freely like plankton, sea squirts are sessile animals after their larval phase: they then remain firmly attached to their substratum, such as rocks and shells. There are 2,300 species of ascidians and three main types: solitary ascidians, social ascidians that form clumped communities by attaching at their bases, and compound ascidians that consist of many small individuals (each individual is called a zooid) forming colonies up to several meters in diameter. Sea squirts feed by taking in water through a tube, the oral siphon. The water enters the mouth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusca
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 gastropod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fusitriton Oregonensis Parasperm
''Fusitriton'' is a genus of large predatory sea snails marine gastropod molluscs in the family Cymatiidae. Species Species within the genus ''Fusitroton'' include: * '' Fusitriton brasiliensis'' Cossignani & Cossignani, 2003 * '' Fusitriton galea'' Kuroda & Habe, 1961 * '' Fusitriton glassi'' Swinnen, 2019 * '' Fusitriton laudandus'' Finlay, 1926 * '' Fusitriton magellanicus'' (Röding, 1798) * '' Fusitriton oregonensis'' (Redfield, 1846) * '' Fusitriton retiolus'' (Hedley, 1914) * '' Fusitriton takedai'' Habe, 1979 ;Species brought into synonymy: * ''Fusitriton algoensis'' Tomlin, 1947: synonym of ''Fusitriton murrayi'' (E. A. Smith, 1891): synonym of '' Fusitriton magellanicus'' (Röding, 1798) (synonym) * ''Fusitriton antarcticus'' Powell, 1958: synonym of '' Antarctoneptunea aurora'' (Hedley, 1916) * ''Fusitriton aurora'' Hedley, 1916: synonym of '' Antarctoneptunea aurora'' (Hedley, 1916) (original combination) * ''Fusitriton futuristi'' Mestayer, 1927: synonym of '' Fusi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sublittoral Zone
The neritic zone (or sublittoral zone) is the relatively shallow part of the ocean above the drop-off of the continental shelf, approximately in depth. From the point of view of marine biology it forms a relatively stable and well-illuminated environment for marine life, from plankton up to large fish and corals, while physical oceanography sees it as where the oceanic system interacts with the coast. Definition (marine biology), context, extra terminology In marine biology, the neritic zone, also called coastal waters, the coastal ocean or the sublittoral zone, refers to that zone of the ocean where sunlight reaches the ocean floor, that is, where the water is never so deep as to take it out of the photic zone. It extends from the low tide mark to the edge of the continental shelf, with a relatively shallow depth extending to about 200 meters (660 feet). Above the neritic zone lie the intertidal (or eulittoral) and supralittoral zones; below it the continental slope begi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fusitriton Oregonensis 2
''Fusitriton'' is a genus of large predatory sea snails marine gastropod molluscs in the family Cymatiidae. Species Species within the genus ''Fusitroton'' include: * ''Fusitriton brasiliensis'' Cossignani & Cossignani, 2003 * ''Fusitriton galea'' Kuroda & Habe, 1961 * ''Fusitriton glassi'' Swinnen, 2019 * ''Fusitriton laudandus'' Finlay, 1926 * ''Fusitriton magellanicus'' (Röding, 1798) * ''Fusitriton oregonensis'' (Redfield, 1846) * ''Fusitriton retiolus'' (Hedley, 1914) * ''Fusitriton takedai'' Habe, 1979 ;Species brought into synonymy: * ''Fusitriton algoensis'' Tomlin, 1947: synonym of ''Fusitriton murrayi'' (E. A. Smith, 1891): synonym of ''Fusitriton magellanicus'' (Röding, 1798) (synonym) * ''Fusitriton antarcticus'' Powell, 1958: synonym of ''Antarctoneptunea aurora'' (Hedley, 1916) * ''Fusitriton aurora'' Hedley, 1916: synonym of ''Antarctoneptunea aurora'' (Hedley, 1916) (original combination) * ''Fusitriton futuristi'' Mestayer, 1927: synonym of ''Fusitriton lau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fusitriton Oregonensis
''Fusitriton oregonensis'' (Oregon hairy triton) is a species of large predatory sea snail, a marine gastropod mollusk in the family Cymatiidae. The snail was given its specific name ''oregonensis'' (meaning "of Oregon") to honor the Oregon Territory by conchologist John Howard Redfield in 1846. It was declared the state seashell of Oregon in 1989 by the 65th Legislative Assembly.Chapter 186 — State Emblems; State Boundary 2017 Oregon Revised Statutes Distribution The Oregon hairy triton is native to the northwestern coast of |
Whorl (mollusc)
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in numerous gastropods, but it is also found in shelled cephalopods including ''Nautilus'', ''Spirula'' and the large extinct subclass of cephalopods known as the ammonites. A spiral shell can be visualized as consisting of a long conical tube, the growth of which is coiled into an overall helical or planispiral shape, for reasons of both strength and compactness. The number of whorls which exist in an adult shell of a particular species depends on mathematical factors in the geometric growth, as described in D'Arcy Wentworth Thompson's classic 1917 book ''On Growth and Form'', and by David Raup. The main factor is how rapidly the conical tube expands (or flares-out) over time. When the rate of expansion is low, such that each subsequent whorl is not that much wider than the previous one, then the adult shell has numerous whorls. When the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Periostracum
The periostracum ( ) is a thin, organic coating (or "skin") that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs, it is primarily seen in snails and clams, i.e. in gastropods and bivalves, but it is also found in cephalopods such as ''Allonautilus scrobiculatus''. The periostracum is an integral part of the shell, and it forms as the shell forms, along with the other shell layers. The periostracum is used to protect the organism from corrosion. The periostracum is visible as the outer layer of the shell of many molluscan species from terrestrial, freshwater, and marine habitats, and may be seen in land snails, river mussels, and other kinds of freshwater bivalves, as well as in many kinds of marine shelled molluscs. The word ''periostracum'' means "around the shell", meaning that the periostracum is wrapped around what is usually the more calcareous part of the shell. Technically, the calcareous part of the shel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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