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Pilina Unguis
''Pilina unguis'' is an extinct species of Paleozoic Silurian monoplacophoran. It was first named as ''Tryblidium unguis'' and described by Gustaf Lindström in Latin from the Silurian deposits of Gotland in Sweden, in 1880. Shell description The length of the shell is 59–67 mm, width 47–51 mm and the height of the shell is 15–16 mm. With is shell size up to 67 mm was at least twice larger than any recent known living monoplacophoran species.Moore J. & Raith Overhill R. 2006. ''An introduction to the invertebrates'', Second Edition. Cambridge, Cambridge University. Press, 319 pp. Page 126 The shell has an obovate outline, anteriorly acuminate, posteriorly expanded, with the greatest width somewhat behind the median, transverse axis of the shell. It is regularly and moderately convex, being the most elevated near the median transverse axis. The apex is close to the anterior margin and only very little prominent. The surface of the shell is covere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustaf Lindström
Gustaf Lindström (27 August 1829 – 16 May 1901) was a Sweden, Swedish paleontologist. He was born in Visby on Gotland. In 1848 he entered Uppsala University, and in 1854 he took his doctor's degree. Having attended a course of lectures in Stockholm by Sven Lovén, he became interested in the zoology of the Baltic Sea, Baltic, and published several papers on the invertebrate fauna (animals), fauna, and subsequently on the fishes. In 1856 he became a school teacher, and in 1858 a master in the grammar school at Visby. His leisure was devoted to researches on the fossils of the Silurian rocks of Gotland, including the corals, brachiopods, gastropods including pteropods, cephalopods and Crustacea. He described also remains of the fish ''Cyathaspis'' from Wenlock Beds in Gotland, with Tamerlan Thorell, a scorpion ''Palaeaphonus'' from Ludlow Beds at Wisby. He determined the true nature of the operculated coral. He was awarded the Murchison Medal by the Geological Society of Lon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apex (mollusc)
In anatomy, an apex (adjectival form: apical) is part of the shell of a mollusk. The apex is the pointed tip (the oldest part) of the shell of a gastropod, scaphopod, or cephalopod. The apex is used in end-blown conches. Gastropods The word "apex" is most often used to mean the tip of the spire of the shell of a gastropod. The apex is the first-formed, and therefore the oldest, part of the shell. To be more precise, the apex would usually be where the tip of the embryonic shell or protoconch is situated, if that is still present in the adult shell (often it is lost or eroded away). Coiled gastropod shells The phrase apical whorls, or protoconch, means the whorls that constitute the embryonic shell at the apex of the shell, especially when this is clearly distinguishable from the later whorls of the shell, otherwise known as the teleoconch. Comparison of the apical part and the whole shell of ''Otukaia kiheiziebisu'': File:Calliostoma kiheiziebisu apex.png File:Calliostoma k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Borkholm
Porkuni (german: Borckholm) is a village in Tapa Parish, Lääne-Viru County, in northern Estonia. The settlement is located around the Lake Porkuni, which is the source of the Valgejõgi River. In 1944, the Battle of Porkuni was fought in the area. Porkuni castle In 1479, a castle was built on an island in the lake by the bishop of Tallinn Simon von der Borch. Porkuni castle (german: Schloss Borkholm) was a four-sided structure surrounding a central courtyard, where a small church stood. In each corner of the castle stood a cannon-tower, and there was also a gate tower which is still preserved, albeit with a few later alterations. Judging from the remains, the castle was built in different stages and the walls were gradually made higher. The castle was destroyed during the Livonian War. In 1870–74, a new manor house was built at the site by the landowner at the time, Otto Ludwig von Rennenkampff. Perhaps not surprisingly, it is built in a neo-Gothic style, with turret ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estonia
Estonia, formally the Republic of Estonia, is a country by the Baltic Sea in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the sea across from Sweden, to the south by Latvia, and to the east by Lake Peipus and Russia. The territory of Estonia consists of the mainland, the larger islands of Saaremaa and Hiiumaa, and over 2,200 other islands and islets on the eastern coast of the Baltic Sea, covering a total area of . The capital city Tallinn and Tartu are the two largest urban areas of the country. The Estonian language is the autochthonous and the official language of Estonia; it is the first language of the majority of its population, as well as the world's second most spoken Finnic language. The land of what is now modern Estonia has been inhabited by '' Homo sapiens'' since at least 9,000 BC. The medieval indigenous population of Estonia was one of the last " pagan" civilisations in Europe to adopt Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, . ''Magnesian limestone'' is an obsolete and poorly-defined term used variously for dolomite, for limes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Follingbo
Follingbo is a populated area, a socken (not to be confused with parish), on the Swedish island of Gotland. It comprises the same area as the administrative Follingbo District, established on 1January 2016. The most distinguishing feature in Follingbo is the high Follingbo transmitter. It became operational on 24December 1959, and has since then been used for broadcasting television and radio to all of Gotland. Geography Follingbo is the name of the socken as well as the district. It is also the name of the small village surrounding the medieval Follingbo Church, sometimes referred to as ''Follingbo kyrkby''. It is situated in the west part of Gotland, just east of Visby. , Follingbo Church belongs to Follingbo parish in Romaklosters pastorat. By the Svaide vät lake in Follingbo is ''Svaidestugan'', a recreation area with tracks for running in summer and cross-country skiing in winter. In 2015, plans were made to restore the partially overgrown lake to its former open s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lummelunda
Lummelunda (sometimes referred to as Lummelunda and Etebols) is a populated area, a socken (not to be confused with parish), on the Swedish island of Gotland. It comprises the same area as the administrative Lummelunda District, established on 1January 2016. Lummelunda is most noted for the Lummelunda Cave, one of the longest caves in Sweden, and the mill with the largest water wheel in northern Europe. Geography Lummelunda is on the northwest coast of Gotland with the Lummelunda stream to the south, approximately north of Visby. The land is mainly plains with high and steep, forested cliffs to the north. Lummeluda is a farming district. On the Lummelunda coast next to the local hostel is Nyhamn harbor and fishing village, dating back to the 17th centurtry. One of Sweden's longest caves, the Lummelunda Cave, is situated at Lummelunda. The cave is part of a nature reserve with the same name as the cave, ''Lummelundagrottan''. The reserve, established in 1989, is and includes th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Väskinde
Väskinde () is a locality on the Swedish island of Gotland. Väskinde is also the name of the larger populated area, ''socken'' (not to be confused with parish). It comprises the same area as the administrative Väskinde District, established on 1January 2016. Geography Väskinde is the name of the locality surrounding the medieval Väskinde Church, sometimes referred to as ''Väskinde kyrkby''. It is also the name of the ''socken'' as well as the district. Väskinde is located in the northwest part of Gotland. , Väskinde Church belongs to Väskinde parish in Norra Gotlands pastorat, along with the churches in Bro, Fole, Lokrume, Hejnum and Bäl. At Själsö in the south part of the Väskinde ''socken'' coast, is Brucebo nature reserve and art museum. Formerly the home of artists William Blair Bruce and his wife Carolina Benedicks-Bruce, it is now managed by the Brucebo Foundation. Further north along the coast is Brissund fishing village and beach. Services In Väskinde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norsholm
Norsholm () is a locality situated in Norrköping Municipality, Östergötland County, Sweden with 615 inhabitants in 2010. It lies around 15 kilometres southwest of Norrköping. Norsholm lies on the E4 and Göta kanal. There are not many work places in the town, and most commute to Norrköping or Linköping Linköping () is a city in southern Sweden, with around 105,000 inhabitants as of 2021. It is the seat of Linköping Municipality and the capital of Östergötland County. Linköping is also the episcopal see of the Diocese of Linköping (Church .... References External linksNorsholm Populated places in Östergötland County Populated places in Norrköping Municipality {{Östergötland-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tryblidium Reticulatum
''Tryblidium reticulatum'' is an extinct species of a paleozoic Silurian monoplacophoran. This species have been discovered and originally described by Gustaf Lindström from Silurian of Gotland in Sweden in 1880. It lived in shallow water. Shell description The length of the shell is 43 mm, width 31 mm and the height of the shell is 10 mm. There are visible muscular attachment scars on the ventral view. References This article incorporates public domain text from reference. External links {{Taxonbar, from=Q7848448 Prehistoric monoplacophorans Molluscs described in 1880 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muscle
Skeletal muscles (commonly referred to as muscles) are organs of the vertebrate muscular system and typically are attached by tendons to bones of a skeleton. The muscle cells of skeletal muscles are much longer than in the other types of muscle tissue, and are often known as muscle fibers. The muscle tissue of a skeletal muscle is striated – having a striped appearance due to the arrangement of the sarcomeres. Skeletal muscles are voluntary muscles under the control of the somatic nervous system. The other types of muscle are cardiac muscle which is also striated and smooth muscle which is non-striated; both of these types of muscle tissue are classified as involuntary, or, under the control of the autonomic nervous system. A skeletal muscle contains multiple fascicles – bundles of muscle fibers. Each individual fiber, and each muscle is surrounded by a type of connective tissue layer of fascia. Muscle fibers are formed from the fusion of developmental myoblasts in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 prosobranch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
