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Pyramidella Canaliculata
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusk 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'' Gray, 1847">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 ... [...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] |
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, 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 of the shell. These folds can be wide or narrow, prominent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyramidella Canaliculata
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusk 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'' Gray, 1847">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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyramidella Camara
''Pyramidella camara'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.Rosenberg, G. (2010). ''Pyramidella camara'' Bartsch, 1927. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533354 on 2012-01-12 Description The shell grows to a length of 2.8 mm. Distribution This species occurs in the Atlantic Ocean off Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ..., USA References External links To Encyclopedia of LifeTo USNM Invertebrate Zoology Mollusca CollectionTo ITISTo World Register of Marine Species Pyramidellidae Gastropods described in 1927 {{Pyra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyramidella Bicolor
''Pyramidella bicolor'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.WoRMS (2011). ''Pyramidella bicolor'' Menke, 1854. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575937 on 2012-01-12Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064 Description The shining shell has an elongate-conic shape. The early whorls are white, the succeeding ones gradually acquiring a pinkish tinge, which deepens and finally tints the last whorl rose-purple. The length of the shell varies between 8 mm and 10 mm. (The whorls of the protoconch are decollated). The eight whorls of the teleoconch are overhanging, flattened, slightly shouldered and minutely crenulated, and deeply sulcate at the periphery. The sutures are strongly impressed. The base of the shell is short, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyramidella Bairdi
''Pyramidella bairdi'' is a species of very small sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.Bouchet, P. (2012). Pyramidella bairdi Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575940 on 2012-02-09 This species was named for William Baird (1803-1872), a British zoologist. Description The broadly conic shell has a milk-white color, with a narrow pale yellow band at the periphery. The shell grows to a length of 5.1 mm. It is deeply, broadly umbilicated. There are least 2½ whorls in the protoconch. They form a depressed helicoid spire, whose axis is at right angles to that of the succeeding turns, in the first of which it is about one-half immersed. The six whorls of the teleoconch are well rounded, faintly roundly shouldered at the summit. The sutures are well impressed. The periphery and the base of the body whorl are somewhat inflate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyramidella Ava
''Pyramidella ava'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.WoRMS (2011). ''Pyramidella ava'' Bartsch, 1926. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575936 on 2012-01-12Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064 Distribution This species occurs in the Pacific Ocean off Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuador, which literally translates as "Republic of the Equator"; Quechua: ''Ikwadur Ripuwlika''; Shuar: ''Eku .... References External links To USNM Invertebrate Zoology Mollusca CollectionTo World Register of Marine Species Pyramidellidae Gastropods described in 1926 {{Pyramidellidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 umb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyramidella Africana
''Pyramidella'' is a genus of minute to medium-sized sea snails, marine gastropod mollusk 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'' Gray, 1847">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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyramidella Adamsi
''Pyramidella adamsi'', common name the Adams' pyram, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.Rosenberg, G. (2011). ''Pyramidella adamsi'' Carpenter, 1864. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575934 on 2012-01-12Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064 This species was named for Charles Baker Adams (1814-1853), an American naturalist. Description The slender shell has an elongate-conic shape. The early whorls are white, later ones diversely variegated, frequently dark brown, yellowish-brown or purplish-brown on the later turns. It is this striking variegated color pattern which at once distinguishes this species from the other West American forms. The length of the shell varies between 11 mm and 19 mm. The spaces betwe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epidermis
The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. The epidermis 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 multiple layers of flattened cells that overlie a base layer (stratum basale) composed of columnar cells arranged perpendicularly. The layers of cells develop from stem cells in the basal layer. The human epidermis is a familiar example of epithelium, particularly a stratified squamous epithelium. The word epidermis is derived through Latin , itself and . Something related to or part of the epidermis is termed epidermal. Structure Cellular components The epidermis primarily consists of keratinocytes ( proliferating basal and differentiated suprabasal), which comprise 90% of its cells, but also contains melanocytes, Langerhans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
