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Trochus Rota
''Trochus'' is a genus of medium-to large-sized, top-shaped sea snails with an operculum, of the family Trochidae, the top snails.Bouchet, P.; Gofas, S. (2010). Trochus Linnaeus, 1758. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138598 on 5 December 2012 When the word "trochus" or "Trochus" is used in reference to fishing sea snails for commercial purposes, the usual species targeted is ''Tectus niloticus'', which is valued for its nacre or mother of pearl layer, which was traditionally made into items such as pearl buttons and jewelry. ''Tectus niloticus'' is no longer classified as a ''Trochus'' species, and it is no longer classified in the family Trochidae; it is now placed in the family Tegulidae. History The name ''Trochus'', according to P. FischerP. Fischer. Monog. Genre Troque, in Kiener's Coquilles Vivantes, Paris, 1880. was used for the first time by Guillaume Rondelet, in 1558, who assembled under this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Maculatus
''Trochus maculatus'', common name the maculated top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The size of the shell varies between 25 mm and 65 mm. This is an excessively variable form. The solid, heavy shell has a conical shape and is falsely umbilicate. The spire is strictly conic, or swollen and somewhat convex below, acuminate above, or sometimes constricted around the upper part of the body whorl. The about 10 whorls are quite planulate, or concave toward the upper, convex toward the lower margins. The body whorl is carinated at the periphery and flat beneath. The color of upper surface consists of longitudinal stripes or flames of brown, purplish, magenta, rose or coral red on a ground of white, corneous, pink or olive-tinted. The flames occupy more space than the ground color or vice versa. Sometimes the coloration consists of very narrow numerous radiating lines, usually broken into tessel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Adams (zoologist)
Henry Adams (1813–1877) was an English naturalist and conchologist. With his brother Arthur Adams, also a noted conchologist, he wrote The genera of recent Mollusca: arranged according to their organization' three volumes, 1858. His father is an architect hired by HM Customs HM Customs (His or Her Majesty's Customs) was the national Customs service of Kingdom of England, England (and then of Kingdom of Great Britain, Great Britain from 1707, the United Kingdom from 1801) until a merger with the HM Excise, Departme .... References English malacologists English taxonomists 1813 births 1877 deaths British conchologists English zoologists 19th-century British zoologists {{UK-zoologist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Concinnus
''Trochus'' is a genus of medium-to large-sized, top-shaped sea snails with an operculum, of the family Trochidae, the top snails.Bouchet, P.; Gofas, S. (2010). Trochus Linnaeus, 1758. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138598 on 5 December 2012 When the word "trochus" or "Trochus" is used in reference to fishing sea snails for commercial purposes, the usual species targeted is ''Tectus niloticus'', which is valued for its nacre or mother of pearl layer, which was traditionally made into items such as pearl buttons and jewelry. ''Tectus niloticus'' is no longer classified as a ''Trochus'' species, and it is no longer classified in the family Trochidae; it is now placed in the family Tegulidae. History The name ''Trochus'', according to P. FischerP. Fischer. Monog. Genre Troque, in Kiener's Coquilles Vivantes, Paris, 1880. was used for the first time by Guillaume Rondelet, in 1558, who assembled under this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Chloromphalus
''Trochus chloromphalus'' is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails. Description The height of the shell attains 19 mm, its diameter 22 mm. The thick, false-umbilicate shell has a conoid shape with an acute apex. It contains eight whorls, the first yellowish, the following planulate, greenish, ornamented with flexuous brown lines. They are separated by a slightly impressed suture and spirally cingulate. The penultimate whorl has about 7 granose unequal ridges, the upper two large, third and fifth smaller. The body whorl is carinated, plano-concave beneath, with 7 concentric lirae, slightly or not at all granulose, separated by obliquely striated interstices. The aperture is rhomboidal, grooved within, the basal margin subcrenate. The oblique columella Lucius Junius Moderatus Columella (, Arabic: ) was a prominent Roman writer on agriculture in the Roman Empire. His in twelve volumes has been completely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Cariniferus
''Trochus cariniferus'' is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.Bouchet, P.; Rosenberg, G. (2014). Trochus cariniferus Reeve, 1842. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=216340 on 2014-06-12 Description The size of the adult shell of this species varies between 10 mm and 30 mm. The rather thin, false-umbilicate shell has a wide-conical shape. It is, dark green, the upper surface irregularly broadly maculate with crimson or purplish red. The ribs of the base are articulated with the same. The about six whorls are somewhat convex. The upper surface of each whorl shows usually four or five spiral closely granose lirae, in the interstices between which sharp microscopic oblique and spiral striae are visible under a lens. The body whorl is carinated at the periphery, usually with six lirae on the upper surface, convex beneath, concentrically lir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Camelophorus
''Trochus camelophorus'' is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.Marshall, B.; Bouchet, P.; Rosenberg, G. (2014). Trochus camelophorus Webster, 1906. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=598209 on 2014-06-12 Description The height of the shell attains 11 mm, its diameter 12 mm. The solid, false-umbilicate, pink shell has a conical shape. Its sculpture shows rounded cinguli of unequal thickness, with rope-like markings, 5 to 6 on the penultimate whorl. Regular radiate riblets cross the cinguli. slightly beading or granulating them. The base of the shell contains 5 to 6 flat spiral ribs, separated by slightly narrower furrows The whole is ornamented with close and fine radiate striae. The colour of the shell is rose, with darker markings above the periphery of the body whorl. The base is yellowish-white, with radiate stripes and spots of ligh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Californicus
''Trochus'' is a genus of medium-to large-sized, top-shaped sea snails with an operculum, of the family Trochidae, the top snails.Bouchet, P.; Gofas, S. (2010). Trochus Linnaeus, 1758. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138598 on 5 December 2012 When the word "trochus" or "Trochus" is used in reference to fishing sea snails for commercial purposes, the usual species targeted is ''Tectus niloticus'', which is valued for its nacre or mother of pearl layer, which was traditionally made into items such as pearl buttons and jewelry. ''Tectus niloticus'' is no longer classified as a ''Trochus'' species, and it is no longer classified in the family Trochidae; it is now placed in the family Tegulidae. History The name ''Trochus'', according to P. FischerP. Fischer. Monog. Genre Troque, in Kiener's Coquilles Vivantes, Paris, 1880. was used for the first time by Guillaume Rondelet, in 1558, who assembled under this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Calcaratus
''Trochus calcaratus'', common name the actor top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.Gofas, S.; Rosenberg, G. (2014). Trochus calcaratus Souverbie in Souverbie & Montrouzier, 1875. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php/aphia.php?p=taxdetails&id=567739 on 2014-06-06 The name ''Trochus histrio'' was not well described by Reeve, and as was his custom in ''Trochus'', only a back view was given by Reeve, so that positive identification is difficult. Description The size of the shell varies between 18 mm and 40 mm. The solid, false-umbilicate shell has an elate-conic shape. The spire has nearly rectilinear outlines. The about 9 whorls are planulate, the body whorl is carinated. The sculpture of the upper surface consists of spiral series, four or five on each whorl, of regular, closely arranged granules, which are either rounded, bead-like, or laterally co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochus Antipodum
''Trochus'' is a genus of medium-to large-sized, top-shaped sea snails with an operculum, of the family Trochidae, the top snails.Bouchet, P.; Gofas, S. (2010). Trochus Linnaeus, 1758. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138598 on 5 December 2012 When the word "trochus" or "Trochus" is used in reference to fishing sea snails for commercial purposes, the usual species targeted is ''Tectus niloticus'', which is valued for its nacre or mother of pearl layer, which was traditionally made into items such as pearl buttons and jewelry. ''Tectus niloticus'' is no longer classified as a ''Trochus'' species, and it is no longer classified in the family Trochidae; it is now placed in the family Tegulidae. History The name ''Trochus'', according to P. FischerP. Fischer. Monog. Genre Troque, in Kiener's Coquilles Vivantes, Paris, 1880. was used for the first time by Guillaume Rondelet, in 1558, who assembled under this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iridescent
Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear gradually to change colour as the angle of view or the angle of illumination changes. Iridescence is caused by wave interference of light in microstructures or thin films. Examples of iridescence include soap bubbles, feathers, butterfly wings and seashell nacre, and minerals such as opal. Pearlescence is a related effect where some or most of the reflected light is white. The term pearlescent is used to describe certain paint finishes, usually in the automotive industry, which actually produce iridescent effects. Etymology The word ''iridescence'' is derived in part from the Greek word ἶρις ''îris'' ( gen. ἴριδος ''íridos''), meaning ''rainbow'', and is combined with the Latin suffix ''-escent'', meaning "having a tendency toward". Iris in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and acted as a messenger of the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearl
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle (mollusc), mantle) of a living Exoskeleton, shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. More commercially valuable pearls are perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, ''pearl'' has become a metaphor for something rare, fine, admirable, and valuable. The most valuable pearls occur spontaneously in the wild but are extremely rare. These wild pearls are referred to as ''natural'' pearls. ''Cultured'' or ''farmed'' pearls from Pinctada, pearl oysters and freshwater mussels make up the majority o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columella (gastropod)
The columella (meaning "little column") or (in older texts) pillar is a central anatomical feature of a coiled snail shell, a gastropod shell. The columella is often only clearly visible as a structure when the shell is broken, sliced in half vertically, or viewed as an X-ray image. The columella runs from the apex of the shell to the midpoint of the undersurface of the shell, or the tip of the siphonal canal in those shells which have a siphonal canal. If a snail shell is visualized as a cone of shelly material which is wrapped around a central axis, then the columella more or less coincides spatially with the central axis of the shell. In the case of shells that have an umbilicus (mollusc), umbilicus, the columella is a hollow structure. The columella of some groups of gastropod shells can have a number of plications or folds (the columellar fold, plaits or plicae), which are usually visible when looking to the inner lip into the Aperture (mollusc), aperture of the shell. These ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
