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Chazyoceras
''Chazyoceras'' ("Horn of the Chazyan") is a moderately large endocerid included in the Endoceratidae with a ''Nanno'' type apex and a ventral siphuncle with a holochoanitic (where "holo" is entire, and "choan" refers to its funnel-shaped opening) wall, characteristic of the family. The siphuncle swelling at the apex is subtriangular in longitudinal profile. The endocones are of medium length. ''Chazyoceras'' was named by Rousseau Flower in 1958. The genotype is ''Chazyoceras valcourense'' which came from the Middle Chazyan (Lower Middle Ordovician) of Valcour Island on Lake Champlain. ''Chazyoceras'' resembles ''Perkinsoceras'' which Flower included in the Allotrioceratidae - a family which Flower named and included in the Endocerida based on the strange fossil, ''Allotrioceras ''Allotrioceras'' is a tubular fossil from the Middle Ordovician of the state of New York, collected by Rousseau H. Flower; included by him in the Endocerida and placed in a new family, the Allo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endoceratidae
Endoceratidae is a family of large to very large straight shelled nautiloid cephalopods belonging to the order Endocerida that lived during the Middle and Late Ordovician. They include the largest known Paleozoic invertebrates, represented by '' Endoceras'' and ''Cameroceras''.Teichert C, (1964). Endoceratoidea; Treatise on Invertebrate Paleontology, ''Part K, Mollusca 3''.Flower R. H. (May 1958). "Some Chazyan and Mohawkian Endoceratida", ''Jour Paleo'' 32 (2) pp 433-458 Description Endocerids are characterized by large, generally ventral siphuncles with simple endocones which lack the more complex structures associated with the Proterocameroceratidae and their derivatives. Endocones, nested cone-shaped deposits characteristic of the Endocerida, form in the apical portion of the siphuncle where they balanced the weight of the animal in the body chamber at the opposite end. This helped assure a horizontal orientation while the endoceratid animal was alive. The septal necks are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perkinsoceras
''Perkinsoceras''is an endocerid genus from the Middle Ordovician (Chazyan) of Champlain Valley established by Flower in 1976, which he added to his Allotrioceratidae based on certain similarities to ''Williamsoceras'' and '' Cacheoceras'' which had been added previously. ''Perkinsoceras'' is characterized by a large ventral siphuncle in broad contact with the ventral margin of the phragmocone -the chambered portion of the shell- which is expanded into a '' Nanno'' type apex, and by a broad longitudinal ventral process about which the endocones are draped. ''Perkinsoceras'' has what have been interpreted as tubules that form where the endocones impinge on the process, a feature also interpreted in ''Williamsoceras'', ''Cacheoceras'' and the distinctly unique ''Allotrioceras ''Allotrioceras'' is a tubular fossil from the Middle Ordovician of the state of New York, collected by Rousseau H. Flower; included by him in the Endocerida and placed in a new family, the Allotriocerat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The Ordovician, named after the Celtic Britons, Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same Rock (geology), rock beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed Stratum, strata were different from those of either the Cambrian or the Silurian systems, and placed them in a system of their own. The Ordovician received international approval in 1960 (forty years after Lapworth's death), when it was adopted as an official period of the Paleozoic Era by the International Union of Geological Sciences, Intern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rousseau Flower
Rousseau Hayner Flower (1913–1988) was an extremely prolific 20th century paleontologist, known for his eccentric personality. Career Although trained as an entomologist, and a specialist in dragonflies and orthopterans, Flower began studying paleontology in the middle of the 1930s. He became an expert in North American cephalopods of the Devonian period as well as the stratigraphy of the early Paleozoic era. His main field was the nautiloids, which he studied intensely, often focusing on life habits and theoretical aspects of paleobiology, but he also penned many papers on fossil corals and other invertebrates. Flower described several hundred new fossil species and over 100 new genera. Eccentricities In the paleontology community, Flower's colorful behavior earned him admirers and enemies—whom he would occasionally "thank" in the acknowledgement sections of his papers or, in one case, in the name of a fossil species. His antics included mocking the alleged low-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endocerida
Endocerida is an extinct nautiloid order, a group of cephalopods from the Lower Paleozoic with cone-like deposits in their siphuncle. Endocerida was a diverse group of cephalopods that lived from the Early Ordovician possibly to the Late Silurian. Their shells were variable in form. Some were straight (orthoconic), others curved (cyrtoconic); some were long (longiconic), others short (breviconic). Some long-shelled forms like '' Endoceras'' attained shell lengths close to . The related ''Cameroceras'' is anecdotally reported to have reached lengths approaching , but these claims are problematic. The overwhelming majority of endocerids and nautiloids in general are much smaller, usually less than a meter long when fully grown. Morphology Endocerids had a relatively small body chamber as well as a proportionally large siphuncle, which in some genera reached nearly half the shell diameter. This suggests that much of the visceral mass may have been housed within the siphuncle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanno (cephalopod)
''Nanno'' is an extinct genus of Endocerid, named by Clarke in 1894 for the apical end of an endocerid from the Trenton Limestone of New York state that has the basic description of the nanno type (where the siphuncle swells to fill the entire apex of the shell, leaving septa and camerae to begin a few centimeters forward). It is possibly the senior synonym for ''Proterovaginoceras'' . As a valid genus, ''Nanno'' is included in the Endoceratidae Endoceratidae is a family of large to very large straight shelled nautiloid cephalopods belonging to the order Endocerida that lived during the Middle and Late Ordovician. They include the largest known Paleozoic invertebrates, represented by '' ... but the nanno type apex may be found in other families. References * Clarke, J. M. (1897)The Lower Silurian Cephalopoda of Minnesota In: E.O. Ulrich, J. M. Clarke, W. H. Scofield & N. H. Winchell ''The Geology of Minnesota. Vol. III, Part II, of the final report. Paleontology.'' Harriso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siphuncle
The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and ''Spirula''. In the case of the cuttlefish, the siphuncle is indistinct and connects all the small chambers of that animal's highly modified shell; in the other cephalopods it is thread-like and passes through small openings in the septa (walls) dividing the camerae (chambers). Some older studies have used the term siphon for the siphuncle, though this naming convention is uncommon in modern studies to prevent confusion with a mollusc organ of the same name. Function The siphuncle is used primarily in emptying water from new chambers as the shell grows. To perform this task, the cephalopod increases the saltiness of the blood in the siphuncle, and the water moves from the more dilute chamber into the blood through osmosis. At the sam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genotype
The genotype of an organism is its complete set of genetic material. Genotype can also be used to refer to the alleles or variants an individual carries in a particular gene or genetic location. The number of alleles an individual can have in a specific gene depends on the number of copies of each chromosome found in that species, also referred to as ploidy. In diploid species like humans, two full sets of chromosomes are present, meaning each individual has two alleles for any given gene. If both alleles are the same, the genotype is referred to as homozygous. If the alleles are different, the genotype is referred to as heterozygous. Genotype contributes to phenotype, the observable traits and characteristics in an individual or organism. The degree to which genotype affects phenotype depends on the trait. For example, the petal color in a pea plant is exclusively determined by genotype. The petals can be purple or white depending on the alleles present in the pea plant. Howev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Champlain
, native_name_lang = , image = Champlainmap.svg , caption = Lake Champlain-River Richelieu watershed , image_bathymetry = , caption_bathymetry = , location = New York/Vermont in the United States; and Quebec in Canada , coords = , type = , inflow = Otter Creek, Winooski River, Missisquoi River, Poultney River, Lamoille River, Ausable River, Chazy River, Boquet River, Saranac River, La Chute River , outflow = Richelieu River , catchment = , basin_countries = Canada, United States , length = , width = , area = , depth = , max-depth = , volume = , residence_time = 3.3 years , shore = , elevation = , islands = 80 ( Grand Isle, North Hero, Isle La Motte, '' see list'') , cities = Burlington, Vermont; Plattsburgh, New York Lake Champlain ( ; french: Lac Champlain) is a natural freshwater lake in North America. It mostly lies between the US states of New York and Vermont, but also extends north into the Canadian province of Quebec. The New York portion of the Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allotrioceras
''Allotrioceras'' is a tubular fossil from the Middle Ordovician of the state of New York, collected by Rousseau H. Flower; included by him in the Endocerida and placed in a new family, the Allotrioceratidae. ''Allotrioceras'' is characterized by a lateral pair of subequal conical structures, resembling the endocones of endocerids, separated by a straight partition that extends more than half way across from either the dorsal or ventral side, as perceived, and runs along the length. What remains is thought to represent a siphuncle, which ranges from about 8 millimeters (0.3 in) to about 15 millimeters (0.6 in) in diameter. On the basis of diagnosis, inclusion of ''Allotrioceras'' and the Allotrioceratidae, for which it is the type, in the endocerida seems at best tentative. Some endocerids, derived from the Proterocameroceratidae, ''Najaceras'', '' Cacheoceras'', and ''Williamsoceras'', have a longitudinal dorsal or ventral process, or both about which the endocones are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Socorro, New Mexico
Socorro (, '' sə-KOR-oh'') is a city in Socorro County in the U.S. state of New Mexico. It is in the Rio Grande Valley at an elevation of . In 2010 the population was 9,051. It is the county seat of Socorro County. Socorro is located south of Albuquerque and north of Las Cruces. History Founding In June 1598, Juan de Oñate led a group of Spanish settlers through the Jornada del Muerto, an inhospitable patch of desert that ends just south of the present-day city of Socorro. As the Spaniards emerged from the desert, Piro Indians of the pueblo of Teypana gave them food and water. Therefore, the Spaniards renamed this pueblo Socorro, which means "help" or "aid". Later, the name "Socorro" would be applied to the nearby Piro pueblo of Pilabó. Nuestra Señora de Perpetuo Socorro, the first Catholic mission in the area, was probably established c. 1626. Fray Agustín de Vetancurt would later write that around 600 people lived in the area during this period. Mines in the Socorr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
