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Atrina Tasmanica
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is ''Atrina fragilis, A. fragilis'', found in British waters. ''Atrina rigida, A. rigida'' (John Lightfoot FRS, Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' (Lewis Weston Dillwyn, Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera ''Pinna (bivalve), Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus ''Pinna (genus), Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic
The Triassic ( ) is a geologic period and system (stratigraphy), system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Year#Abbreviations yr and ya, Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic, Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vert ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Affinis
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Japonica
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Jacksoniana
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Inflata
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Hystrix
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Healey Dall
William Healey Dall (August 21, 1845 – March 27, 1927) was an American naturalist, a prominent malacologist, and one of the earliest scientific explorers of interior Alaska. He described many mollusks of the Pacific Northwest of America, and was for many years America's preeminent authority on living and fossil mollusks. Dall also made substantial contributions to ornithology, zoology, physical and cultural anthropology, oceanography and paleontology. In addition he carried out meteorological observations in Alaska for the Smithsonian Institution. Biography Early life Dall was born in Boston, Massachusetts. His father Charles Henry Appleton Dall, (1816–86), a Unitarian minister, moved in 1855 to India as a missionary. His family however stayed in Massachusetts, where Dall's mother Caroline Wells Healey was a teacher, transcendentalist, reformer, and pioneer feminist. In 1862, Dall's father, on one of his few brief visits home, brought his son in contact with some natu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Harrisii
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Pennant
Thomas Pennant (14 June OS 172616 December 1798) was a Welsh naturalist, traveller, writer and antiquarian. He was born and lived his whole life at his family estate, Downing Hall near Whitford, Flintshire, in Wales. As a naturalist he had a great curiosity, observing the geography, geology, plants, animals, birds, reptiles, amphibians and fish around him and recording what he saw and heard about. He wrote acclaimed books including ''British Zoology'', the ''History of Quadrupeds'', ''Arctic Zoology'' and ''Indian Zoology'' although he never travelled further afield than continental Europe. He knew and maintained correspondence with many of the scientific figures of his day. His books influenced the writings of Samuel Johnson. As an antiquarian, he amassed a considerable collection of art and other works, largely selected for their scientific interest. Many of these works are now housed at the National Library of Wales. As a traveller he visited Scotland and many other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Exusta
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Cumingii
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrina Chinensis
''Atrina'' is a cosmopolitan genus of bivalve molluscs belonging to the family Pinnidae. A typical species is '' A. fragilis'', found in British waters. '' A. rigida'' ( Lightfoot, 1786) is found on the southeast coast of North America and in the West Indies. The type species is ''A. nigra'' ( Dillwyn, 1817, originally ''P. nigra''). ''Atrina'' is considered to represent the more primitive form within the Pinnidae; however, both genera '' Pinna'' and ''Atrina'' are very ancient. The genus ''Atrina'' is represented within the fossil record from the Triassic period to the Quaternary period (age range: 242.0 to 0.0 million years ago). These fossils have been found all over the world. Description Molluscs within this genus are characterized by elongated, wedge-shaped shells, distinguished from the genus '' Pinna'' by the lack of any grooves in the nacreous lining of the shell, and by the central positioning of the adductor scar. As with other pen shells ( Pinnidae) they commo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
