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Apertural
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 (abalone) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosobranch g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Operculum (gastropod)
An operculum (; ) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails, including the Helicinidae, Cyclophoridae, Aciculidae, Maizaniidae, Pomatiidae, etc. The operculum is attached to the upper surface of the foot and in its most complete state, it serves as a sort of "trapdoor" to close the aperture (mollusc), aperture of the shell when the soft parts of the animal are retracted. The shape of the operculum varies greatly from one family of gastropods to another. It is fairly often circular, or more or less oval in shape. In species where the operculum fits snugly, its outline corresponds exactly to the shape of the aperture (mollusc), aperture of the shell and it serves to seal the entrance of the shell. Many families have opercula that are reduced in size, and which are not capable of closing the shell aperture. Opercula have sometimes been modifie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norelona Pyrenaica Shell
''Norelona '' is a monospecific genus of air-breathing land snail, a terrestrial animal, terrestrial pulmonate gastropod mollusk in the family Elonidae.MolluscaBase eds. (2021). MolluscaBase. Norelona H. Nordsieck, 1986. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=996224 on 2021-10-03 Species * ''Norelona pyrenaica'' (Draparnaud, 1805) References * Nordsieck, H. (1986). Das System der tertiären Helicoidea Mittel- und Westeuropas (Gastropoda: Stylommatophora). Heldia. 1(4): 109-120. * Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. {{taxonbar, from=Q18591393 Elonidae Monotypic gastropod genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epitonium
''Epitonium'' is a genus of small predatory sea snails, marine (ocean), marine gastropod mollusks. ''Epitonium'' is the type genus of the family (biology), family Epitoniidae, the wentletraps.Bouchet, P.; Gofas, S. (2010). Epitonium Röding, 1798. 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=137943 on 2010-11-22 The common name wentletraps is derived from the Dutch language, Dutch word ''wenteltrap'', denoting a Stairway#Spiral and helical stairs, spiral staircase. This refers to the striking form and sculpture of the shells of the mollusks in this genus, and to a lesser extent, the whole family. The genus ''Epitonium'' has been divided in the past by some authors into several subgenera, but these subgenera were based only on shell characters and did not reflect the true underlying relationships or phylogeny. Shell description ''Epitoni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Personidae
The Personidae are a family of sea snails, marine gastropod molluscs in the order Littorinimorpha Littorinimorpha is a large order of snails, gastropods, consisting primarily of sea snails ( marine species), but also including some freshwater snails ( limnic species) and land snails ( terrestrial species).Bouchet P. & Rocroi J.-P. (Ed.); Frà ....MolluscaBase eds. (2021). MolluscaBase. Personidae Gray, 1854. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=23090 on 2021-12-30 Taxonomy * '' Distorsio'' Röding, 1798 * †'' Kotakaia'' Beu, 1988 * '' Personopsis'' Beu, 1988 ;Synonyms: * ''Calcarella'' Souleyet, 1850: synonym of ''Distorsio'' Röding, 1798 * ''Distorta'' Perry, 1811: synonym of ''Distorsio'' Röding, 1798 * ''Distortrix'' Link, 1807: synonym of ''Distorsio'' Röding, 1798 (objective synonym of Distorsio) * ''Persona'' Montfort, 1810: synonym of ''Distorsio'' Röding, 1798 (objective synonym of Dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dialeuca Conspersula
''Dialeuca'' is a genus of gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...s belonging to the family Cepolidae. The species of this genus are found in Central America. Species: * '' Dialeuca blandiana'' (C. B. Adams, 1850) * '' Dialeuca conspersula'' (L. Pfeiffer, 1846) * '' Dialeuca nemoraloides'' (Adams, 1845) * '' Dialeuca subconica'' (C. B. Adams, 1845) References * Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017. External links Albers, J. C. (1850). Die Heliceen nach natürlicher Verwandtschaft systematisch geordnet. Berlin: Enslin. 262 pp {{Taxonbar, from=Q106797930 Cepolidae (gastropods) Gastropod genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyalosagda Arboreoides
''Hyalosagda arboreoides'' is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Sagdidae. Distribution This species occurs in Jamaica Jamaica is an island country in the Caribbean Sea and the West Indies. At , it is the third-largest island—after Cuba and Hispaniola—of the Greater Antilles and the Caribbean. Jamaica lies about south of Cuba, west of Hispaniola (the is .... Tryon G. W. 1887 ''Manual of conchology; structural and systematic. With illustrations of the species''. Second series: PulmonataVolume 3 Helicidae - Volume I. pag8 References External links * Photos at Sagdidae Gastropods described in 1845 {{Sagdidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Melongenidae
The Melongenidae, the crown conchs and their relatives, are a taxonomic family of large to very large marine gastropods in the superfamily Buccinoidea.MolluscaBase eds. (2021). MolluscaBase. Melongenidae Gill, 1871 (1854). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=160182 on 2021-02-27 Taxonomy For a while prior to 2004, the genera '' Busycon'' and '' Busycotypus'' were placed in the Melongenidae. Then, in 2004, based on their digestive system The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Digestion involves the breakdown of food into smaller and smaller compone ...s and on cladistic analysis by Kosyan & Kantor (2004),Kosyan A. R. & Kantor Yu. I. (2004). "Morphology, taxonomic status and relationships of Melongenidae (Gastropoda: Neogastropoda)". ''Ruthenica'' 14(1): 9-36abstract a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auriculella
''Auriculella'' is a genus of air-breathing tropical land snails, terrestrial pulmonate gastropod mollusks in the family Achatinellidae. They are endemic to Hawaii (United States) and several species are extinct. They are oviparous (egg laying) and hermaphroditic A hermaphrodite () is a sexually reproducing organism that produces both male and female gametes. Animal species in which individuals are either male or female are gonochoric, which is the opposite of hermaphroditic. The individuals of many .... Among achatinellid snails, they are unique in the fact that they are not restricted to living on plants endemic to the Hawaiian islands. They have been known to relatively thrive on non-native plants such as ginger and night jasmine. ''Auriculella'' is the type genus of the subfamily Auriculellinae. Species Species within the genus ''Auriculella'' include: * '' Auriculella auricula'' * '' Auriculella ambusta'' * '' Auriculella brunnea'' * '' Auriculella castanea'' * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helix
A helix (; ) is a shape like a cylindrical coil spring or the thread of a machine screw. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word ''helix'' comes from the Greek word , "twisted, curved". A "filled-in" helix – for example, a "spiral" (helical) ramp – is a surface called a '' helicoid''. Properties and types The pitch of a helix is the height of one complete helix turn, measured parallel to the axis of the helix. A double helix consists of two (typically congruent) helices with the same axis, differing by a translation along the axis. A circular helix (i.e. one with constant radius) has constant band curvature and constant torsion. The slope of a circular helix is commonly defined as the ratio of the circumference of the circular cylinder that it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
