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Bellybutton Nautilus
''Nautilus macromphalus'', the bellybutton nautilus, is a species of nautilus native to the waters off New Caledonia, the Loyalty Islands, and northeastern Australia. The shell of this species lacks a callus, leaving the umbilicus exposed, in which the inner coils of the shell are visible. This opening constitutes about 15% of the shell diameter at its widest point. Like all ''Nautilus'' species, ''N. macromphalus'' usually lives at depths of several hundred metres. During the night, however, they rise to much shallower waters (2 to 20 m depth) to feed. The tentacles of this species are long and thin, having raised ridges which help provide grip when catching prey. ''N. macromphalus'' is the smallest species of nautilus. The shell is usually up to around 16 cm in diameter, although the largest specimen ever recorded measured 180 mm. More than 35 shells of ''N. macromphalus'' dating to around 6400–7100 years BP were found in a cenote on Lifou, the Loyalty I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Brettingham Sowerby II
George Brettingham Sowerby II (1812 – 26 July 1884) was a British naturalist, illustrator, and conchologist. Together with his father, George Brettingham Sowerby I, he published the ''Thesaurus Conchyliorum'' and other illustrated works on molluscs. He was an elected a Fellow of the Linnean Society on 7 May 1844. He was the father of George Brettingham Sowerby III, also a malacologist. He died on 26 July 1884 and is buried on the west side of Highgate Cemetery with his father George Brettingham Sowerby I and sister Charlotte Caroline Sowerby. See also *Sowerby family The Sowerby family () was a British family of several generations of naturalists, illustrators, botanists, and zoologists active from the late 18th century to the mid twentieth century. *James Sowerby (1757–1822) **James De Carle Sowerby (178 ... References * H. Crosse & P. Fischer, 1885. ''Nécrologie''. Journal de Conchyliologie 33(1): 80. * K. v. W. Palmer, 1965. ''Who were the Sowerbys?'' Ame ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cenote
A cenote ( or ; ) is a natural pit, or sinkhole, resulting from the collapse of limestone bedrock that exposes groundwater. The regional term is specifically associated with the Yucatán Peninsula of Mexico, where cenotes were commonly used for water supplies by the ancient Maya, and occasionally for sacrificial offerings. The term derives from a word used by the lowland Yucatec Maya——to refer to any location with accessible groundwater. Similar rock-sided sinkholes like cenotes are common geological forms in low-altitude regions, particularly on islands, coastlines, and platforms with young post-Paleozoic limestone with little soil development. The term ''cenote'' has also been used to describe similar karst features in other countries such as Cuba and Australia. Definition and description Cenotes are surface connections to subterranean water bodies. While the best-known cenotes are large open-water pools measuring tens of meters in diameter, such as those at Chichen It ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mark Norman (marine Biologist)
Mark Douglas Norman is a marine biologist living in southern Australia, where he works through the University of Melbourne and Museum Victoria. For over a decade, Norman has been working exclusively with cephalopods and he is one of the leading scientists in the field, having discovered over 150 new species of octopuses. The best known of these is probably the mimic octopus The mimic octopus (''Thaumoctopus mimicus'') is a species of octopus from the Indo-Pacific region. Like other octopuses, it uses its chromatophores to disguise itself with its background. However, it is noteworthy for being able to impersonate a .... Mark Norman is the author of ''Cephalopods: A World Guide'', a book published in 2000 containing over 800 colour photographs of cephalopods in their natural habitat. References Australian marine biologists Teuthologists Living people Year of birth missing (living people) {{Biologist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gazelle Peninsula
The Gazelle Peninsula is a large peninsula in northeastern East New Britain, Papua New Guinea located on the island of New Britain within the Bismarck Archipelago, situated in the southwestern Pacific Ocean. The Rabaul caldera is located on the northern tip of the peninsula. Upon the Gazelle Peninsula are the Baining Mountains, of which the highest point is Mount Sinewit at . The Gazelle Peninsula houses Vulcan Crater and Mount Tavurvur, both of which conducted volcanic activity in the 20th and 21st centuries and have provided extremely fertile soils. The body of the Gazelle Peninsula is about . The southern isthmus upon which the Gazelle Peninsula is connected to the main body of East New Britain is reduced to about . The Editors of Encyclopædia Britannica, (2015). Gazelle peninsula. Retrieved April 23, 2019 from https://www.britannica.com/place/Gazelle-Peninsula History The peninsula was named by Georg Gustav Freiherr von Schleinitz after his ship, . 1884-1909 1884: Ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karst
Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. Subterranean drainage may limit surface water, with few to no rivers or lakes. However, in regions where the dissolved bedrock is covered (perhaps by debris) or confined by one or more superimposed non-soluble rock strata, distinctive karst features may occur only at subsurface levels and can be totally missing above ground. The study of ''paleokarst'' (buried karst in the stratigraphic column) is important in petroleum geology because as much as 50% of the world's hydrocarbon reserves are hosted in carbonate rock, and much of this is found in porous karst systems. Etymology The English word ''karst'' was borrowed from German in the late 19th century, which entered German much earlier ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiocarbon Date
Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby. It is based on the fact that radiocarbon () is constantly being created in the Earth's atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of it contains begins to decrease as the undergoes radioactive decay. Measuring the amount of in a sample from a dead plant or animal, such as a piece of wood or a fragment of bone, provides information that can be used to calcu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lifou
Lifou is a communes of France, commune of France in the Loyalty Islands Province of New Caledonia in the Pacific Ocean. Geography Lifou is made up of Lifou Island, the largest and most heavily populated of the Loyalty Islands, its smaller neighbour Tiga Island, and several uninhabited islets in between these two. All these islands lie among the Loyalty Islands, northeast of New Caledonia, New Caledonia's mainland. At , Lifou Island is the largest atoll in the world. The town of Wé, on Lifou Island, is the administrative centre of the commune of Lifou as well as the provincial seat of the Loyalty Islands Province. Climate Lifou has a tropical monsoon climate (Köppen climate classification ''Am''). The average annual temperature in Lifou is . The average annual rainfall is with March as the wettest month. The temperatures are highest on average in February, at around , and lowest in August, at around . The highest temperature ever recorded in Lifou was on 7 February 2016; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Before Present
Before Present (BP) years, or "years before present", is a time scale used mainly in archaeology, geology and other scientific disciplines to specify when events occurred relative to the origin of practical radiocarbon dating in the 1950s. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date (epoch) of the age scale. The abbreviation "BP" has been interpreted retrospectively as "Before Physics", which refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, which scientists must now account for. In a convention that is not always observed, many sources restrict the use of BP dates to those produced with radiocarbon dating; the alternative notation RCYBP stands for the explicit "radio carbon years before present". Usage The BP scale is sometimes used for dates established by means other than radiocarbon dating, such as stratigraphy. This usage differs from t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nautilus
The nautilus (, ) is a pelagic marine mollusc of the cephalopod family Nautilidae. The nautilus is the sole extant family of the superfamily Nautilaceae and of its smaller but near equal suborder, Nautilina. It comprises six living species in two genera, the type of which is the genus ''Nautilus''. Though it more specifically refers to species ''Nautilus pompilius'', the name chambered nautilus is also used for any of the Nautilidae. All are protected under CITES Appendix II. Depending on species, adult shell diameter is between 4 and 10 inches. Nautilidae, both extant and extinct, are characterized by involute or more or less convolute shells that are generally smooth, with compressed or depressed whorl sections, straight to sinuous sutures, and a tubular, generally central siphuncle.Kümmel, B. 1964. Nautiloidae-Nautilida, in the Treatise on Invertebrate Paleontology, Geological Society of America and Univ of Kansas Press, Teichert and Moore eds. Having survived relatively u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Registry Of World Record Size Shells
The ''Registry of World Record Size Shells'' is a Conchology, conchological work listing the largest (and in some cases smallest) verified mollusc shell, shell specimens of various marine molluscan taxon, taxa. A successor to the earlier ''World Size Records'' of Robert Jacob Lewis Wagner, Robert J. L. Wagner and R. Tucker Abbott, it has been published on a semi-regular basis since 1997, changing ownership and publisher a number of times. Originally planned for release every two years, new editions are now published annually. Since 2008 the entire registry has been available online in the form of a searchable Online database, database. The registry is continuously expanded and now contains more than 24,000 listings and 85,000 supporting images.Registry of World Record Size Shells wrs-shells.com. Quiquandon, P. (16 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tentacle
In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anatomically, the tentacles of animals work mainly like muscular hydrostats. Most forms of tentacles are used for grasping and feeding. Many are sensory organs, variously receptive to touch, vision, or to the smell or taste of particular foods or threats. Examples of such tentacles are the eyestalks of various kinds of snails. Some kinds of tentacles have both sensory and manipulatory functions. A tentacle is similar to a cirrus, but a cirrus is an organ that usually lacks the tentacle's strength, size, flexibility, or sensitivity. A nautilus has cirri, but a squid has tentacles. Invertebrates Molluscs Many molluscs have tentacles of one form or another. The most familiar are those of the pulmonate land snails, which usually have two sets of tentacles on the head: when extended ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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