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Helminthochiton
''Helminthochiton'' is an extinct of polyplacophoran mollusc. Helminthochiton became extinct during the Permian period. ''Helminthochiton grayiae'' was recognised as the type species for ''Septemchiton''. This was named for Elizabeth Gray who collected fossils at Girvan Girvan ( gd, Inbhir Gharbhain, "mouth of the River Girvan") is a burgh and harbour town in Carrick, South Ayrshire, Scotland. Girvan is situated on the east coast of the Firth of Clyde, with a population of about 6,450. It lies south of Ayr, .... ''Helminthochiton thraivensis'' has been reassigned to the genus '' Phthipodochiton'' in 2012. References Prehistoric chiton genera Ordovician first appearances Permian genus extinctions {{chiton-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiton
Chitons () are marine molluscs of varying size in the class Polyplacophora (), formerly known as Amphineura. About 940 extant and 430 fossil species are recognized. They are also sometimes known as gumboots or sea cradles or coat-of-mail shells or suck-rocks, or more formally as loricates, polyplacophorans, and occasionally as polyplacophores. Chitons have a shell composed of eight separate shell plates or valves. These plates overlap slightly at the front and back edges, and yet articulate well with one another. Because of this, the shell provides protection at the same time as permitting the chiton to flex upward when needed for locomotion over uneven surfaces, and even allows the animal to curl up into a ball when dislodged from rocks. The shell plates are encircled by a skirt known as a girdle. Habitat Chitons live worldwide, from cold waters through to the tropics. They live on hard surfaces, such as on or under rocks, or in rock crevices. Some species live quite hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phthipodochiton
''Phthipodochiton'' is an extinct genus of molluscs, known from several fossils from the upper Ordovician fauna of the Lady Burn Starfish beds of Girvan, Scotland. It shows a mixture of aplacophoran body plan and polyplacophoran-like valves, and it is an informative fossil in the evolution of aculiferan mollusks. It was previously classified under the genus ''Helminthochiton'', but it has been reassigned to its own genus in 2012. Morphology ''Phthipodochiton'' body is worm-like, with eight polyplacophoran-like valves but no true foot. Head and tail valves are slightly smaller than the intermediate ones. The only ornaments on the valves appear to be growth lines. The body is also covered by a sheet of spicules ; no radula has been preserved. Life habits ''Phthipodochiton'' was carnivorous, feeding on crinoids, as shown by a fossil preserved with gut contents. In contrast with modern chitons, ''Phthipodochiton'' probably did not creep on its foot but had a locomotion style sim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusc
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species. The proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gastropods ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Permian
The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleozoic Era; the following Triassic Period belongs to the Mesozoic Era. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the region of Perm in Russia. The Permian witnessed the diversification of the two groups of amniotes, the synapsids and the sauropsids ( reptiles). The world at the time was dominated by the supercontinent Pangaea, which had formed due to the collision of Euramerica and Gondwana during the Carboniferous. Pangaea was surrounded by the superocean Panthalassa. The Carboniferous rainforest collapse left behind vast regions of desert within the continental interior. Amniotes, which could better cope with these drier conditions, rose to dominance in place of their am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elizabeth Gray (fossil Collector)
Elizabeth Gray (born Elizabeth Anderson; 21 February 1831 – 11 February 1924) was a Scottish early fossil collector. Gray created scientifically organised collections of fossils for several museums. Life Elizabeth Anderson was born in Alloway in 1831. She and her family moved to Enoch near Girvan in Ayrshire where they farmed and Elizabeth attended a small private school. Her father was described as an enthusiastic collector of fossils who had a type of trilobite named after him. Anderson was sent to a boarding school in Glasgow when she was fifteen. She stayed for a year and then returned to help in the home.R. J. Cleevely, 'Gray , Elizabeth (1831–1924)', ''Oxford Dictionary of National Biography'', Oxford University Press, 200accessed 18 Nov 2015/ref> Marriage (and holidays in Girvan) She married Robert Gray on 8 April 1856 and they both shared an interest in collecting fossils each holiday back in Girvan. She was assisted by their children when they were able. They live ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Girvan
Girvan ( gd, Inbhir Gharbhain, "mouth of the River Girvan") is a burgh and harbour town in Carrick, South Ayrshire, Scotland. Girvan is situated on the east coast of the Firth of Clyde, with a population of about 6,450. It lies south of Ayr, and north of Stranraer, the main ferry port from Scotland to Northern Ireland. Deriving its name from the river which runs through the landscape the etymology of Girvan has possible Brythonic origins, related to the Welsh: ''Gearafon'' or ''Gwyrddafon'', "river flowing through the green flourishing place, from afon or avon, a river, and Gwyrdd, green, flourishing"). Prehistory and archaeology The earliest evidence of human habitation in the Girvan area dates to the Mesolithic. Between 1996 and 1998, archaeological investigations were undertaken by GUARD archaeology (then part of the University of Glasgow) as part of an expansion of the William Grant & Sons distillery. This work discovered several burnt mounds that dated to the lat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Chiton 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] |
