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Pyramidella Solidula
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusc in the subfamily Pyramidellinae of the family Pyramidellidae, the pyrams and their allies. ''Pyramidella'' is the type genus of the family Pyramidellidae. Nomenclature The generic name ''Pyramidella'' Lamarck, 1799, has been validated under the Plenary Powers of the ICZN, Opinion 386 (1955). The name ''Obeliscus'' Anonymus, 1797 Obeliscus.html" ;"title=" ''Obeliscus"> ''Obeliscus'' Gray, 1847has also been used for this genus, whereas the name ''Pyramidella'' was used for the genus now known as ''Otopleura'' Fischer, 1885. General description The shell has an elongate-conic shape, slightly striated. The many Whorl (mollusc), whorls of the teleoconch are usually inflated and regularly increasing. They are longitudinally ribbed or smooth. The semioval Aperture (mollusc), aperture is entire, widened at its base and rounded in front. .The columella has one to three folds. The sharp outer lip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Gastropod Shell
The gastropod shell is part of the body of many gastropods, including snails, 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, ostracum, is typically made of calcium carbonate (CaCO3) precipitated into an organic matrix ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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] [Amazon] |
Pyramidella Corrugata
''Pyramidella corrugata'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.WoRMS (2010). ''Pyramidella corrugata''. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=208420 on 2012-01-12 Description The length of the shell attains 23 mm. The elongated shell is slender and turreted. It is white, with small sparse, scattered yellow spots near the suture. The pointed spire is formed of nine or ten slightly convex whorls, the surface of which is covered with longitudinal folds, also convex, very distinct, smooth, numerous, regular, prolonged even to the summit of the whorls, and accompanied with some small, scattered, yellowish spots. Numerous compressed transverse striae are found between the interstices. The suture is linear. The narrow aperture is ovate, elongated, and slightly narrowed at its extremities. It forms at its base a little depression in an o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pyramidella Canaliculata
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusc in the subfamily Pyramidellinae of the family Pyramidellidae, the pyrams and their allies. ''Pyramidella'' is the type genus of the family Pyramidellidae. Nomenclature The generic name ''Pyramidella'' Lamarck, 1799, has been validated under the Plenary Powers of the ICZN, Opinion 386 (1955). The name ''Obeliscus'' Anonymus, 1797 Obeliscus.html" ;"title=" ''Obeliscus"> ''Obeliscus'' Gray, 1847has also been used for this genus, whereas the name ''Pyramidella'' was used for the genus now known as ''Otopleura'' Fischer, 1885. General description The shell has an elongate-conic shape, slightly striated. The many Whorl (mollusc), whorls of the teleoconch are usually inflated and regularly increasing. They are longitudinally ribbed or smooth. The semioval Aperture (mollusc), aperture is entire, widened at its base and rounded in front. .The columella has one to three folds. The sharp outer l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pyramidella Bicolor
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusc in the subfamily Pyramidellinae of the family Pyramidellidae, the pyrams and their allies. ''Pyramidella'' is the type genus of the family Pyramidellidae. Nomenclature The generic name ''Pyramidella'' Lamarck, 1799, has been validated under the Plenary Powers of the ICZN, Opinion 386 (1955). The name ''Obeliscus'' Anonymus, 1797 Obeliscus.html" ;"title=" ''Obeliscus"> ''Obeliscus'' Gray, 1847has also been used for this genus, whereas the name ''Pyramidella'' was used for the genus now known as ''Otopleura'' Fischer, 1885. General description The shell has an elongate-conic shape, slightly striated. The many Whorl (mollusc), whorls of the teleoconch are usually inflated and regularly increasing. They are longitudinally ribbed or smooth. The semioval Aperture (mollusc), aperture is entire, widened at its base and rounded in front. .The columella has one to three folds. The sharp outer li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pyramidella Bairdi
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine (ocean), marine gastropod mollusc in the subfamily Pyramidellinae of the family Pyramidellidae, the pyrams and their allies. ''Pyramidella'' is the type genus of the family Pyramidellidae. Nomenclature The generic name ''Pyramidella'' Lamarck, 1799, has been validated under the Plenary Powers of the ICZN Code, ICZN, Opinion 386 (1955). The name ''Obeliscus'' Anonymus, 1797 [= ''Obeliscus'' Gray, 1847] has also been used for this genus, whereas the name ''Pyramidella'' was used for the genus now known as ''Otopleura'' Fischer, 1885. General description The shell has an elongate-conic shape, slightly striated. The many Whorl (mollusc), whorls of the teleoconch are usually inflated and regularly increasing. They are longitudinally ribbed or smooth. The semioval Aperture (mollusc), aperture is entire, widened at its base and rounded in front. .The Columella (gastropod), columella has one to three folds. The sha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pyramidella Ava
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusc in the subfamily Pyramidellinae of the family Pyramidellidae, the pyrams and their allies. ''Pyramidella'' is the type genus of the family Pyramidellidae. Nomenclature The generic name ''Pyramidella'' Lamarck, 1799, has been validated under the Plenary Powers of the ICZN, Opinion 386 (1955). The name ''Obeliscus'' Anonymus, 1797 Obeliscus.html" ;"title=" ''Obeliscus"> ''Obeliscus'' Gray, 1847has also been used for this genus, whereas the name ''Pyramidella'' was used for the genus now known as ''Otopleura'' Fischer, 1885. General description The shell has an elongate-conic shape, slightly striated. The many Whorl (mollusc), whorls of the teleoconch are usually inflated and regularly increasing. They are longitudinally ribbed or smooth. The semioval Aperture (mollusc), aperture is entire, widened at its base and rounded in front. .The columella has one to three folds. The sharp outer li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pyramidella Alfredensis
''Pyramidella alfredensis'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.MolluscaBase eds. (2022). MolluscaBase. Pyramidella alfredensis Bartsch, 1915. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=588522 on 2022-03-13 Description The milk-white shell has an elongate-conic shape. The 1¾ whorls of the protoconch are very small. They are planorboid, having their axis at right angles to that of succeeding turns. The left side of the nucleus projects considerably beyond the outline of the spire of the teleoconch . The ten whorls of the teleoconch are almost flat and are feebly shouldered at the summit. They are marked by exceedingly fine, retractive, incremental lines, and numerous microscopic spiral striations. The suture is moderately constricted. The periphery of the body whorl is well rounded. The base of the shell is well rounded, decidedly um ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pyramidella Africana
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusc in the subfamily Pyramidellinae of the family Pyramidellidae, the pyrams and their allies. ''Pyramidella'' is the type genus of the family Pyramidellidae. Nomenclature The generic name ''Pyramidella'' Lamarck, 1799, has been validated under the Plenary Powers of the ICZN, Opinion 386 (1955). The name ''Obeliscus'' Anonymus, 1797 Obeliscus.html" ;"title=" ''Obeliscus"> ''Obeliscus'' Gray, 1847has also been used for this genus, whereas the name ''Pyramidella'' was used for the genus now known as ''Otopleura'' Fischer, 1885. General description The shell has an elongate-conic shape, slightly striated. The many Whorl (mollusc), whorls of the teleoconch are usually inflated and regularly increasing. They are longitudinally ribbed or smooth. The semioval Aperture (mollusc), aperture is entire, widened at its base and rounded in front. .The columella has one to three folds. The sharp outer li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pyramidella Adamsi
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusc in the subfamily Pyramidellinae of the family Pyramidellidae, the pyrams and their allies. ''Pyramidella'' is the type genus of the family Pyramidellidae. Nomenclature The generic name ''Pyramidella'' Lamarck, 1799, has been validated under the Plenary Powers of the ICZN, Opinion 386 (1955). The name ''Obeliscus'' Anonymus, 1797 Obeliscus.html" ;"title=" ''Obeliscus"> ''Obeliscus'' Gray, 1847has also been used for this genus, whereas the name ''Pyramidella'' was used for the genus now known as ''Otopleura'' Fischer, 1885. General description The shell has an elongate-conic shape, slightly striated. The many Whorl (mollusc), whorls of the teleoconch are usually inflated and regularly increasing. They are longitudinally ribbed or smooth. The semioval Aperture (mollusc), aperture is entire, widened at its base and rounded in front. .The columella has one to three folds. The sharp outer lip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Epidermis
The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and Subcutaneous tissue, hypodermis. The epidermal layer provides a barrier to infection from environmental pathogens and regulates the amount of water released from the body into the atmosphere through transepidermal water loss. The epidermis is composed of stratified squamous epithelium, multiple layers of flattened cells that overlie a base layer (stratum basale) composed of Epithelium#Cell types, columnar cells arranged perpendicularly. The layers of cells develop from stem cells in the basal layer. The thickness of the epidermis varies from 31.2μm for the penis to 596.6μm for the Sole (foot), sole of the foot with most being roughly 90μm. Thickness does not vary between the sexes but becomes thinner with age. The human epidermis is an example of epithelium, particularly a stratified squamous epithelium. The word epidermis is derived through Latin , itself and . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
