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Stomatellidae
Stomatellinae is a subfamily of small sea snails with a brilliantly nacreous interior of the shell, marine gastropod mollusks in the family Trochidae, the top snails.Gofas, S. (2012). Stomatellinae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=382176 on 2012-06-12 Taxonomy In the earlier classification used in the Treatise on Invertebrate Paleontology, the Stomatellidae was included in the Archaeogastropoda, however, this taxon is now largely abandoned in favor of the more recently defined Vetigastropoda. According to Bouchet & Rocroi (2005), Williams et al. (2008)Williams S. T., Karube S. & Ozawa T. (September 2008) "Molecular systematics of Vetigastropoda: Trochidae, Turbinidae and Trochoidea redefined". '' Zoologica Scripta'' 37(5): 483-506. and Williams et al. (2010)Williams S. T., Donald K. M., Spencer H. G. & Nakano, T. (2010). "Molecular systematics of the marine gastropod families Trochidae and Calliostoma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stomatia
''Stomatia'', common name the keeled wide mouths, is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails. Description The spiral shell is oblong or depressed orbicular. The spire is prominent but short. The surface is tubercled or keeled. The whorls show a series of short folds below the suture. The aperture is either oblong or transversely oval, and longer than wide or the reverse. The interior of the shell is nacreous. There is no operculum. ''Stomatia'' is closely allied to '' Stomatella'', differing in the generally more elongated shell with a series of short folds or puckers below the sutures. Usually the body whorl has a tuberculous carina. The animal is too large to entirely enter the shell. The foot is large, fleshy, tubercular, greatly produced posteriorly. The epipodium is fringed, with a more prominent fimbriated lobe behind the left tentacle, and on the right there is a slightly projecting fold or gutter leading to the respirato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stomatella
''Stomatella'' is a genus of small to medium-sized sea snails, marine gastropod mollusks in the family Trochidae, the top snails and their allies. Lamarck in the Philos. Zool., 1809, mentioned the genus as "Stomatelle" but did not describe the genus, nor did he cite any species. He cited the genus in Anim. s. Vert. vol. vi, p. 209, 1819. with as first species ''Stomatella imbricata'' (now a synonym of ''Granata imbricata'' (Lamarck, 1816) ) According to the Nomenclator Zoologicus of ubio.orgthe authorship should be attributed to Rafinesque., who Latinized the name to ''Stomatella''. Description The spiral, orbicularly depressed shell is imperforate. The conical spire is elevated but short. The whorls are rounded but not plicate below the sutures. The last whorl forms the greater part of the shell. The variegated surface is spirally ribbed. The large aperture is wider than the long, nacreous interior. The horny operculum is circular and multispiral. The foot is trunca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microtis (gastropod)
''Microtis'' is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.Bouchet, P. (2012). ''Microtis'' H. Adams & A. Adams, 1850. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=512300 on 2012-11-23 Description The spiral shell is suborbicular and depressed. It has two tuberculated ridges. The spire is slightly projecting. The aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An opt ... is very large, and wider than long. Its interior is pearly within. The columellar margin is spiral and visible as far as the apex of the spire. There is no operculum. Species Species within the genus ''Microtis (gastropod)'' include: * '' Microtis tuberculata'' A. Adams, 1850 The following species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeogastropoda
Archaeogastropoda (also known as Aspidobranchia) was a taxonomic order of sea snails used in older classifications of gastropods, i.e. snails and slugs. Archeogastropoda are marine prosobranch gastropod mollusks, mainly herbivores, typically having two gills and a double-chambered heart, with the eggs and sperm discharged directly into the water. They were traditionally regarded as a relatively primitive group. This older classification of the gastropods is based on the classification of Johannes Thiele (1925). This classification was not based on true phylogenetic relationships, but on more general affinities between the groups. In the last few years, two new cladistic taxonomies of the gastropods have been published (in 1997 and 2005). This has led to an extensive reclassification of gastropod taxa. The taxon Archaeogastropoda was found to be a paraphyletic group, and therefore unacceptable in a strictly cladistic classification. In the 1997 classification, most of the former ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic
The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vertebrates during this time. A specialized subgroup of archo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umbilicus (mollusk)
The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) side of many (but not all) snail shells, including some species of sea snails, land snails, and freshwater snails. The word is also applied to the depressed central area on the planispiral coiled shells of ''Nautilus'' species and fossil ammonites. (These are not gastropods, but shelled cephalopods.) In gastropods The spirally coiled whorls of gastropod shells frequently connect to each other by their inner sides, during the natural course of its formation. This results in a more or less solid central axial pillar, known as the columella. The more intimate the contact between the concave side of the whorls is, the more solid the columella becomes. On the other hand, if this connection is less intense, a hollow space inside the whorls may re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur William Baden Powell
Arthur William Baden Powell (4 April 1901 – 1 July 1987) was a New Zealand malacologist, naturalist and palaeontologist, a major influence in the study and classification of New Zealand molluscs through much of the 20th century. He was known to his friends and family by his third name, "Baden". Biography Early life The name Baden had been a given name in a Powell family since 1731, when Susannah Powell née Thistlethwayte (1696–1762) gave to her child (1731–1792) the maiden name of her mother, Susannah Baden (1663–1692). The name Baden, particularly when associated with the surname Powell, became famous in 1900–1901, the year Arthur William Baden Powell was born, because of the siege of Mafeking, the most famous British action in the Second Boer War, which turned the British commander of the besieged, Robert Baden-Powell, into a national hero. Throughout the British Empire, babies were named after him. No family connection has yet been established between Arthur W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stomatolina
''Stomatolina'' is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails. Description The depressed shell is rather flattened above and below. The aperture is quite oblique. The sculpture consists of numerous spirals, of which several have low carinae, more numerous intermediate riblets, and still more numerous interstitial spiral striae. These are sometimes decussated by growth lines. Distribution This maritime genus occurs in the Red Sea and off Indo-Malaysia, Oceania, Cook Islands, French Polynesia, Korea, the Philippines and Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ... (Northern Territory, Queensland). Species Species within the genus ''Stomatolina'' include: * '' Stomatolina angulata'' (A. Adams, 1850) * '' Stomatolina arabi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudostomatella
''Pseudostomatella'' is a genus of small sea snails, marine gastropod mollusks in the subfamily Stomatellinae of the family Trochidae, the top snails. Distribution This marine genus has a wide distribution. The species occur in the Central and East Indian Ocean, Indo-Malaysia and off Australia Species Species within the genus ''Pseudostomatella'' include: * '' Pseudostomatella baconi'' (Adams, A. in Adams, H.G. & A. Adams, 1854) * '' Pseudostomatella clathratula'' (Adams, A. in Adams, H.G. & A. Adams, 1854) * '' Pseudostomatella coccinea'' (A. Adams, 1850) ** forma : ''Pseudostomatella coccinea flammulata'' (f) Pilsbry, H.A., 1920 * '' Pseudostomatella cycloradiata'' Usticke, 1959 * '' Pseudostomatella decolorata'' (Gould, A.A., 1848) * ''Pseudostomatella erythrocoma'' (Dall, 1889) * '' Pseudostomatella martini'' Poppe, Tagaro & Dekker, 2006 * '' Pseudostomatella orbiculata'' (A. Adams, 1850) * '' Pseudostomatella papyracea'' (Gmelin, J.F., 1791) * '' Pseudostomatella selecta'' ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calliotrochus
''Calliotrochus'' is a genus of sea snails, marine gastropod mollusks in the subfamily Stomatellinae of the family Trochidae, the top snails.Bouchet, P. (2012). ''Calliotrochus'' P. Fischer, 1879. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=512277 on 2012-11-23 Description This genus consists of thin, small, shining globose species with a turbinate shape. It has rounded, smooth or spirally striate, convex whorls. The aperture is rounded. The outer lip and columella are simple, thin and arcuate. The umbilicus is narrow. Species Species within the genus ''Calliotrochus'' include: * ''Calliotrochus marmoreus'' (Pease, 1861) The following species were brought into synonymy: * ''Calliotrochus excellens'' Iredale, 1937: synonym of ''Calliotrochus marmoreus'' (Pease, 1861) * ''Calliotrochus legrandi'' May, W.L. 1921: synonym of '' Minopa legrandi'' (Petterd, 1879) * ''Calliotrochus normalis'' Iredale, 1937: synonym of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nacre
Nacre ( , ), also known as mother of pearl, is an organicinorganic composite material produced by some molluscs as an inner shell layer; it is also the material of which pearls are composed. It is strong, resilient, and iridescent. Nacre is found in some of the most ancient lineages of bivalves, gastropods, and cephalopods. However, the inner layer in the great majority of mollusc shells is porcellaneous, not nacreous, and this usually results in a non-iridescent shine, or more rarely in non-nacreous iridescence such as ''flame structure'' as is found in conch pearls. The outer layer of cultured pearls and the inside layer of pearl oyster and freshwater pearl mussel shells are made of nacre. Other mollusc families that have a nacreous inner shell layer include marine gastropods such as the Haliotidae, the Trochidae and the Turbinidae. Physical characteristics Structure and appearance Nacre is composed of hexagonal platelets of aragonite (a form of calcium carbonate) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iridescent
Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear to gradually change color as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, feathers, butterfly wings and seashell nacre, and minerals such as opal. It is a kind of structural coloration that is due to wave interference of light in microstructures or thin films. 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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
