Spire (mollusc)
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Spire (mollusc)
A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods. In textbook illustrations of gastropod shells, the tradition (with a few exceptions) is to show most shells with the spire uppermost on the page. The spire, when it is not damaged or eroded, includes the protoconch (also called the nuclear whorls or the larval shell), and most of the subsequent teleoconch whorls (also called the postnuclear whorls), which gradually increase in area as they are formed. Thus the spire in most gastropods is pointed, the tip being known as the " apex". The word "spire" is used, in an analogy to a church spire or rock spire, a high, thin, pinnacle. The "spire angle" is the angle, as seen from the apex, at which a sp ...
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Tarebia Granifera Shell
''Tarebia'' is a genus of freshwater snails, gastropod mollusks in the subfamily Thiarinae of the family Thiaridae. Species Species within the genus ''Tarebia'' include: * † '' Tarebia acuta'' (J. Sowerby, 1822) * † ''Tarebia bojolaliensis'' (K. Martin, 1905) * † ''Tarebia cardinalis'' (Lapparent, 1938) * † ''Tarebia cerithioides'' (Rolle, 1858) * † ''Tarebia darmavangiensis'' (K. Martin, 1905) * '' Tarebia granifera'' (Lamarck, 1816) * ''Tarebia hainesiana'' * † ''Tarebia issiracensis'' (Fontannes, 1884) * ''Tarebia invieta'' * ''Tarebia lateritia'' * ''Tarebia luzoniensis'' * † ''Tarebia preangerensis'' (K. Martin, 1905) * ''Tarebia semigranosa ''Tarebia'' is a genus of freshwater snails, gastropod mollusks in the subfamily Thiarinae of the family Thiaridae. Species Species within the genus ''Tarebia'' include: * † '' Tarebia acuta'' (J. Sowerby, 1822) * † '' Tarebia bojolal ...'' * † '' Tarebia trimargaritifera'' (Ludwig, 1865) ;Synon ...
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Spire
A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spires are typically made of stonework or brickwork, or else of timber structures with metal cladding, ceramic tiling, roof shingles, or slates on the exterior. Since towers supporting spires are usually square, square-plan spires emerge directly from the tower's walls, but octagonal spires are either built for a pyramidal transition section called a ''broach'' at the spire's base, or else freed spaces around the tower's summit for decorative elements like pinnacles. The former solution is known as a ''broach spire''. Small or short spires are known as ''spikes'', ''spirelets'', or '' flèches''. Etymology This sense of the word spire is attested in English since the 1590s, ''spir'' having been used in Middle Low German since the 14th centu ...
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Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for '' Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a ''gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosob ...
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Decollate Snail
The decollate snail, scientific name ''Rumina decollata'', is a medium-sized predatory land snail, a species of terrestrial pulmonate gastropod mollusk in the family Achatinidae. It is a European species that has been introduced in a number of areas worldwide. Taxa inquirenda * ''Rumina decollata var. dentata'' Pallary, 1922 * ''Rumina decollata var. fusca'' Pallary, 1899 * ''Rumina decollata var. striatula'' Pallary, 1920 Distribution This species is native to the Mediterranean excluding south-east Mediterranean. It is introduced in Israel and in Egypt since Roman times.Mienis H. K. (2003). "A new colony of ''Rumina saharica'' discovered in Israel". ''Tentacle'11 11-12. It has been introduced into North America, including Phoenix and Glendale, Arizona, and other areas Fresno, California as a biological control agent, in hopes of controlling populations of the brown garden snail. It is found in Great Britain Great Britain is an island in the North Atlantic Ocean off ...
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Caecum (genus)
''Caecum'' is a genus of minute sea snails, marine gastropod micromolluscs or micromollusks in the family Caecidae or blind shells. Distribution This genus occurs worldwide in warm and temperate seas. Many species live in sponges, in sandy spots on reefs, or in grassy beds in shallow waters in bays and lagoons. Some species are very common and can be extremely numerous where they do occur, such as the "beautiful caecum"(''Caecum pulchellum''), but even they can be easily overlooked as they are so tiny. Many species are considered to be uncommon, but this assessment may be a result of lack of proper sampling. Shell description The shells in this genus, like the others in the family, are very small with a length between 2 mm and 6 mm. Their colour is white to yellowish white and some are almost translucent. They are unusual in that the teleoconch of the adult shell is a curving tube for most of its length. In the first stage of the shell it is spiral-shaped but soon beco ...
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Triton (gastropod)
''Charonia'' is a genus of very large sea snail, commonly known as Triton's trumpet or Triton snail. They are marine gastropod mollusks in the monotypic family Charoniidae. Etymology The common name "Triton's trumpet" is derived from the Greek god Triton, who was the son of Poseidon, god of the sea. The god Triton is often portrayed blowing a large seashell horn similar to this species. Fossil records This genus is known in the fossil records as far back as the Cretaceous period. Fossils are found in the marine strata throughout the world. Description Species within the genus ''Charonia'' have large fusiform shells, usually whiteish with brown or yellow markings. The shell of the giant triton '' Charonia tritonis'' (Linnaeus, 1758), which lives in the Indo-Pacific, can grow to over half a metre (20 inches) in length. One slightly smaller (shell size but still very large species, '' Charonia variegata'' (Lamarck, 1816), lives in the western Atlantic, from North Carolina to ...
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Turritella
''Turritella'' is a genus of medium-sized sea snails with an operculum, marine gastropod mollusks in the family Turritellidae.Vos, C.; Gofas, S. (2013). Turritella Lamarck, 1799. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138615 on 2013-06-02 They have tightly coiled shells, whose overall shape is basically that of an elongated cone. The name ''Turritella'' comes from the Latin word ''turritus'' meaning "turreted" or "towered" and the diminutive suffix ''-ella''. Species Valid Valid species within the genus ''Turritella'' are listed below. Fossil species are marked with a dagger "†". * ''Turritella acropora'' (Dall, 1889) * '' Turritella albolapis'' Finlay, 1924 * '' Turritella algida'' Melvill & Standen, 1912 * '' Turritella anactor'' Berry, 1957 * ''Turritella annulata'' Kiener, 1843 * † ''Turritella apicalis'' - Pleistocene of Florida * ''Turritella attenuata'' Reeve, 1849 * '' Turritella aurocincta'' Ma ...
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Euomphalus
''Euomphalus'' is a genus of fossil marine gastropods known to have lived from the Silurian to the Middle Permian.J.B.Knight,et al 1960. Treatise on Invertebrate Paleontology, Part I, Mollusca 1, ch on systematic descriptions. Geol Soc of America and Univ Kansas Press.(in Czech) Pek I., Vašíček Z., Roček Z., Hajn. V. & Mikuláš R.: ''Základy zoopaleontologie''. - Olomouc, 1996. 264 pp., . Description ''Euomphalus'' is characterized by a closely coiled shell with a depressed to slightly elevated spire and a channel-bearing angulation (a selenizone) on the upper surface of the whorls. The lower surface of the whorls is rounded to angular. '' Amphiscapha'', '' Philoxene'', and '' Straparollus'' are among similar related genera. '' Serpulospira'', also related, differs in having a broadly open spiral in the adult form. Taxonomy ''Euomphalus'' is the type genus In biological taxonomy, the type genus is the genus which defines a biological family and the root of the famil ...
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Vermetus
''Vermetus'' is a genus of sea snails, marine gastropod mollusks in the family Vermetidae, the worm snails or worm shells. The genus ''Vermetus'' is very ancient: it occurs in the fossil record from the Jurassic to the Quaternary (age range: from 164.7 to 0.0 million years ago). Species Species within the genus ''Vermetus'' include: * '' Vermetus adansonii'' Daudin, 1800 * '' Vermetus afer'' ( Gmelin, 1791) * '' Vermetus annulus'' Rousseau in Chenu, 1843 * '' Vermetus balanitintinnabuli'' Mörch, 1862 * '' Vermetus bieleri'' Scuderi, Swinnen & Templado, 2017 * '' Vermetus biperforatus'' Bieler, Collins, Golding & Rawlings, 2019 * '' Vermetus brasiliensis'' Rousseau in Chenu, 1844 * '' Vermetus carinatus'' Quoy & Gaimard, 1834 * '' Vermetus dentiferus'' Rousseau in Chenu, 1844 * '' Vermetus enderli'' Schiaparelli & Metivier, 2000 * '' Vermetus eruca'' (Lamarck, 1818) (taxon inquirendum) * '' Vermetus granulatus'' ( Gravenhorst, 1831) * '' Vermetus intestinalis'' ( Gmelin, 1791) ...
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Magilus
''Magilus'' is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails. This genus was brought by Michel (1988) into the separate family Magilidae together with '' Latiaxis'' Species Species within the genus ''Magilus'' include: * '' Magilus antiquus'' Montfort, 1810 * '' Magilus lankae'' Deraniyagala, 1968 * '' Magilus latens'' Bozzetti, 2011 * '' Magilus sowerbyi'' Massin, 1982 ;Species brought into synonymy : * ''Magilus antiquatus'' Linnaeus: synonym of ''Magilus antiquus'' Montfort, 1810 * ''Magilus costatus'' G. B. Sowerby II, 1872: synonym of ''Magilus sowerbyi'' Massin, 1982 (invalid: junior homonym of ''Magilus costatus'' Chenu, 1843; ''M. sowerbyi'' is a replacement name) * ''Magilus cumingii'' (H. Adams & A. Adams, 1864): synonym of '' Coralliophila cumingii'' (H. Adams & A. Adams, 1864) * ''Magilus djedah'' Chenu, 1843: synonym of '' Leptoconchus djedah'' (Chenu, 1843) (original combination) * ''Magilus ellipticus'' ...
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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, prominen ...
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Limpet
Limpets are a group of aquatic snails that exhibit a conical gastropod shell, shell shape (patelliform) and a strong, muscular foot. Limpets are members of the class Gastropoda, but are polyphyletic, meaning the various groups called "limpets" descended independently from different ancestral gastropods. This general category of conical shell is known as "patelliform" (dish-shaped). All members of the large and ancient marine clade Patellogastropoda are limpets. Within that clade, the members of the Patellidae family in particular are often referred to as "true limpets". Other groups, not in the same family, are also called limpets of one type or another, due to the similarity of their shells' shape. Examples include the Fissurellidae ("keyhole limpet") family, which is part of the Vetigastropoda clade (many other members of the Vetigastropoda do not have the Morphology (biology), morphology of limpets) and the Siphonariidae ("false limpets"), which use a siphon to pump water o ...
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