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Tryblidium Pileolum
''Tryblidium'' is a paleozoic genus of Ordovician and Silurian monoplacophorans. The generic name comes from the Greek (τρυβλίον), which means patella. Species Species in the genus ''Tryblidium'' include: , accessed 22 August 2009. * '''' * '' Tryblidium arctica'' * '' T ... [...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] |
Tryblidium Niobe
''Tryblidium'' is a paleozoic genus of Ordovician and Silurian monoplacophorans. The generic name comes from the Greek (τρυβλίον), which means patella. Species Species in the genus ''Tryblidium'' include: , accessed 22 August 2009. * '''' * '' Tryblidium arctica'' * '' T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ordovician First Appearances
The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic 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 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 beds in North Wales in the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed 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 Geological Congress. Life continued to flourish during the Ordovician as it did in the earlier Cambr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Mollusc Genera
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Monoplacophorans
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Helcionopsis Radiatum
''Helcionopsis radiatum'' is an extinct species of paleozoic monoplacophoran in the family Tryblidiidae. This species was first named as ''Tryblidium radiatum'' and described from Silurian in crystalline limestone of Wialmsudd near Fårösund in Sweden by 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 ... in 1884. Lindsröm found only one specimen. Shell description The shell is oval and much elevatedly conical. The greatest height is lying near the middle of the longitudinal axis. The apex is in anterior end, truncated, curved as to lean forwards over the anterior margin of the aperture. The shell between the apex and the margin is consequently much concave. The apertural border is straight and horizontal. The surface is covered by fine, closely packed, radia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pilina Esthonum
''Pilina'' is an extinct genus of paleozoic monoplacophorans in the family Tryblidiidae. Species Species in the genus ''Pilina'' include: * ''Pilina acuminatum'' Perner (in Koken & Perner), 1925 * '' Pilina cheyennica'' Peel, 1977 - from Ordovician in the Keel Member in Oklahoma * '' Pilina esthonum'' (Koken, 1897)Koken E. 1897. ''Die Gastropoden des baltischen Untersilurs''. Bulletin de l'Académie Impériale des Sciences de St. Pétersburg 7(2):97-214. - synonym: ''Triblidium esthonum'' * '' Pilina ovoideum'' Perner (in Koken & Perner), 1925 * '' Pilina solarium'' (Lindström, 1884)Lindström G. 1884''On the Silurian Gastropoda and Pteropoda of Gotland'' Stockholm, 250 ppPage 59 figure 3-4. - synonym: ''Palaeacmaea solarium'' * '' |
Tryblidium Thorsteinssoni
''Tryblidium'' is a paleozoic genus of Ordovician and Silurian monoplacophorans. The generic name comes from the Greek (τρυβλίον), which means patella. Species Species in the genus ''Tryblidium'' include: , accessed 22 August 2009. * '''' * '' Tryblidium arctica'' * '' T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tryblidium Simplex
''Tryblidium'' is a paleozoic genus of Ordovician and Silurian monoplacophorans. The generic name comes from the Greek (τρυβλίον), which means patella. Species Species in the genus ''Tryblidium'' include: , accessed 22 August 2009. * '''' * '' Tryblidium arctica'' * '' T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tryblidium Rugosum
''Tryblidium'' is a paleozoic genus of Ordovician and Silurian monoplacophorans. The generic name comes from the Greek (τρυβλίον), which means patella. Species Species in the genus ''Tryblidium'' include: , accessed 22 August 2009. * '''' * '' Tryblidium arctica'' * '' T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tryblidium Pileolum
''Tryblidium'' is a paleozoic genus of Ordovician and Silurian monoplacophorans. The generic name comes from the Greek (τρυβλίον), which means patella. Species Species in the genus ''Tryblidium'' include: , accessed 22 August 2009. * '''' * '' Tryblidium arctica'' * '' T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
