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Clausilium
The clausilium is a calcareous anatomical structure which is found in one group of air-breathing land snails: terrestrial pulmonate gastropod mollusks in the family Clausiliidae, the door snails. The clausilium is one part of the clausilial apparatus. The presence of a clausilium is the reason for the common name "door snails", because all the snails in this family have a roughly spoon-shaped "door" or clausilium, which can slide down to close the aperture of the shell. However, this structure is emphatically not the same thing as an operculum, which is virtually non-existent in pulmonate snails, only occurring in the Amphibolidae. The exact shape of the clausilium varies from genus to genus: it can be tongue-shaped, spoon-shaped or spatula-shaped. The wide flat end of the clausilium can close the aperture of the snail shell, and thus protect the soft parts against predation by animals such as carnivorous beetle larvae. The narrow end of the clausilium slides in a groove, which is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alinda Biplicata
''Alinda biplicata'',Kantor Yu I., Vinarski M. V., Schileyko A. A. & Sysoev A. V. (published online on March 2, 2010). "Catalogue of the continental mollusks of Russia and adjacent territories". http://www.ruthenica.com/documents/Continental_Russian_molluscs_ver2-3-1.pdf Version 2.3.1. also known as ''Balea biplicata'', common name the two lipped door snail or Thames door snail, is a species of air-breathing land snail, a terrestrial molluscs, terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails, all of which have a clausilium. Distribution This species is known to occur in a number of European countries and islands including: * List of non-marine molluscs of the Czech Republic, Czech Republic * List of non-marine molluscs of Poland, Poland * List of non-marine molluscs of Slovakia, Slovakia * List of non-marine molluscs of Hungary, Hungary * List of non-marine molluscs of Romania, Romania * List of non-marine molluscs of Bulgaria, Bulgaria * List ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcareous
Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines. In zoology ''Calcareous'' is used as an adjectival term applied to anatomical structures which are made primarily of calcium carbonate, in animals such as gastropods, i.e., snails, specifically about such structures as the operculum, the clausilium, and the love dart. The term also applies to the calcium carbonate tests of often more or less microscopic Foraminifera. Not all tests are calcareous; diatoms and radiolaria have siliceous tests. The molluscs are calcareous, as are calcareous sponges ( Porifera), that have spicules which are made of calcium carbonate. In botany ''Calcareous grassland'' is a form of grassland characteristic of soils containing much calcium carbonate from underlying chalk or limestone rock. In medicine The term is used in pathology, for example i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larva
A larva (; plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle. The larva's appearance is generally very different from the adult form (''e.g.'' caterpillars and butterflies) including different unique structures and organs that do not occur in the adult form. Their diet may also be considerably different. Larvae are frequently adapted to different environments than adults. For example, some larvae such as tadpoles live almost exclusively in aquatic environments, but can live outside water as adult frogs. By living in a distinct environment, larvae may be given shelter from predators and reduce competition for resources with the adult population. Animals in the larval stage will consume food to fuel their transition into the adult form. In some organisms like polychaetes and barnacles, adults are immobil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrogastra Plicatula
''Macrogastra plicatula'' is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails. MolluscaBase eds. (2021). MolluscaBase. Macrogastra plicatula (Draparnaud, 1801). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1050411 on 2021-06-01 ;Subspecies: * ''Macrogastra plicatula amiatensis'' H. Nordsieck, 2006 * ''Macrogastra plicatula apennina'' (Gentiluomo, 1868) * ''Macrogastra plicatula aprutica'' H. Nordsieck, 2006 * ''Macrogastra plicatula licana'' (A. J. Wagner, 1912) * ''Macrogastra plicatula plicatula'' (Draparnaud, 1801) * ''Macrogastra plicatula plicosula'' (M. von Gallenstein, 1852) * ''Macrogastra plicatula superflua'' (Charpentier, 1852) Description Like all the species in this family, ''Macrogastra plicatula'' has a clausilium. The weight of the adult live snail is 66.0±1.6 mg.Boch S., Prati D., Werth S., Rüetschi J. & Fischer M. (2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cochlodina Laminata
''Cochlodina laminata'' is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails, all of which have a clausilium.MolluscaBase eds. (2020). MolluscaBase. Cochlodina A. Férussac, 1821. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=933875 on 2020-08-25 ;Subspecies: * ''Cochlodina laminata albanica'' S. H. F. Jaeckel, 1956 * ''Cochlodina laminata grossa'' (Rossmässler, 1835) * ''Cochlodina laminata insulana'' E. Gittenberger, 1967 * ''Cochlodina laminata laminata'' (Montagu, 1803) * ''Cochlodina laminata nana'' (Möllendorff, 1873) * ''Cochlodina laminata oreinos'' (A. J. Wagner, 1914) * ''Cochlodina laminata partita'' (Westerlund, 1892) Distribution This species occurs in much of Europe, including: * The Czech Republic * Bulgaria * Netherlands * Poland * Slovakia * UkraineBalashov I. & Gural-Sverlova N. 2012. An annotated checklist of the terrestri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columella (mollusc)
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] |
Clausilia Dubia
''Clausilia dubia'' is a species of small, very elongate, left-handed air-breathing land snail, a sinistral terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails, all of which have a clausilium.MolluscaBase eds. (2020). MolluscaBase. Clausilia dubia Draparnaud, 1805. Accessed through: World Register of Marine Species at: http://marinespecies.org/aphia.php?p=taxdetails&id=1050049 on 2020-08-17 Subspecies * ''Clausilia dubia alpicola'' Clessin, 1878 * ''Clausilia dubia bucculenta'' Klemm, 1960 * ''Clausilia dubia carpathica'' Brancsik, 1888 * ''Clausilia dubia dubia'' Draparnaud, 1805 * ''Clausilia dubia dydima'' F. J. Schmidt, 1847 * ''Clausilia dubia floningiana'' Westerlund, 1890 * ''Clausilia dubia geretica'' Bourguignat, 1877 * ''Clausilia dubia gracilior'' Clessin, 1887 * ''Clausilia dubia gratiosa'' Sajó, 1968 * ''Clausilia dubia grimmeri'' L. Pfeiffer, 1848 * ''Clausilia dubia huettneri'' Klemm, 1960 * ''Clausilia dubia ingenua'' Hudec & Bra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamella (zoology)
Lamellae on a gecko's foot. In surface anatomy, a lamella is a thin plate-like structure, often one amongst many lamellae very close to one another, with open space between. Aside from respiratory organs, they appear in other biological roles including filter feeding and the traction surfaces of geckos. In fish, gill lamellae are used to increase the surface area in contact with the environment to maximize gas exchange (both to attain oxygen and to expel carbon dioxide) between the water and the blood. In fish gills there are two types of lamellae, primary and secondary. The primary gill lamellae (also called gill filament) extends from the gill arch, and the secondary gill lamellae extends from the primary gill lamellae. Gas exchange primarily occurs at the secondary gill lamellae, where the tissue is notably only one cell layer thick. Furthermore, countercurrent gas exchange at the secondary gill lamellae further maximizes oxygen uptake and carbon dioxide release. See also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garage Door Opener
A garage door opener is a motorized device that opens and closes a garage door controlled by switches on the garage wall. Most also include a handheld radio remote control carried by the owner, which can be used to open and close the door from a short distance. The electric opener The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage. As in an elevator, the electric motor does not provide most of the power to move a heavy garage door. Instead, most of door's weight is offset by the counterbalance springs attached to the door. (Even manually operated garage doors have counterbalances; otherwise, they would be too heavy for a person to open or close them.) In a typical design, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphibolidae
Amphibolidae is a family of air-breathing snails with opercula, terrestrial pulmonate gastropod molluscs. This family of pulmonate gastropods, for breathe air, but also have opercula and at least some species go through a free-swimming veliger stage. Taxonomy 2005 taxonomy According to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), it was an only family within a superfamily Amphiboloidea in the informal group Basommatophora, within the Pulmonata. 2010 taxonomy Jörger et al. (2010)Jörger K. M., Stöger I., Kano Y., Fukuda H., Knebelsberger T. & Schrödl M. (2010). "On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia". ''BMC Evolutionary Biology'' 10: 323. . have moved Amphiboloidea to Panpulmonata. Genera Genera and species within the family Amphibolidae include: * '' Amphibola'' Schumacher, 1817 * '' Lactiforis'' Golding, Ponder & Byrne, 2007Golding R. E., Ponder W. F. & Byrne M. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Land Snail
A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial gastropod mollusks that have shells (those without shells are known as slugs). However, it is not always easy to say which species are terrestrial, because some are more or less amphibious between land and fresh water, and others are relatively amphibious between land and salt water. Land snails are a polyphyletic group comprising at least ten independent evolutionary transitions to terrestrial life (the last common ancestor of all gastropods was marine). The majority of land snails are pulmonates that have a lung and breathe air. Most of the non-pulmonate land snails belong to lineages in the Caenogastropoda, and tend to have a gill and an operculum. The largest clade of land snails is the Cyclophoroidea, with more than 7,000 species. Many of these operculate land snails live in habitats or microhabitats ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operculum (gastropod)
The 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; the structure is found in some marine and freshwater gastropods, and in a minority of terrestrial gastropods, including the families 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 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 of the shell and it serves to seal the entrance of the shell. Many families have opercula that are reduced in size, and which a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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