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Strophomena
''Strophomena'' is a genus of brachiopods belonging to the order Strophomenida family Strophomenidae, named by Rafinesque in 1824. They were stationary epifaunal suspension feeders. These brachiopods (often known as lamp shells) lived from the Ordovician period to the Devonian period. Distribution Devonian of Italy, Silurian to Devonian of Algeria, Morocco; Silurian of Australia, Morocco, Russia, Sweden, United States; Ordovician of Australia, Canada, China, France, Ireland, Kazakhstan, Norway, Portugal, Russia, Spain, Sweden, the United Kingdom, United States; Llandeilo of China; Whiterockian of United States; Dawan of China; Arenig of China. Species *''Strophomena amoena'' *''Strophomena billingsi'' *''Strophomena concordensis'' *''Strophomena costellata'' *''Strophomena dignata'' *''Strophomena extensa'' *''Strophomena euglypha'' *''Strophomena filitexta'' *''Strophomena fluctuosa'' *''Strophomena hecuba'' *''Strophomena hirundo'' *''Strophomena incurvata'' *''Strophomena ...
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Strophomenida
Strophomenida is an extinct order of articulate brachiopods which lived from the lower Ordovician period to the mid Carboniferous period. Strophomenida is part of the extinct class Strophomenata, and was the largest known order of brachiopods, encompassing over 400 genera. Some of the largest and heaviest known brachiopod species belong to this class. Strophomenids were among the most diverse and abundant brachiopods during the Ordovician, but their diversity was strongly impacted at the Late Ordovician mass extinction. Survivors rediversified into new morphologies in the Silurian, only to be impacted once again at the Late Devonian mass extinction. However, they still survived till the end of the Permian. Adult strophomenids lack an opening for the pedicle (stalk), so in life, they either lay free or cemented the ventral valve (lower shell) onto a firm substrate at the umbo (hinge). In juveniles, a tiny hole for the pedicle was present on the ventral valve near the umbo, bu ...
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Brachiopod
Brachiopods (), phylum (biology), phylum Brachiopoda, are a phylum of animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Two major categories are traditionally recognized, articulate and inarticulate brachiopods. The word "articulate" is used to describe the tooth-and-groove structures of the valve-hinge which is present in the articulate group, and absent from the inarticulate group. This is the leading diagnostic skeletal feature, by which the two main groups can be readily distinguished as fossils. Articulate brachiopods have toothed hinges and simple, vertically oriented opening and closing muscles. Conversely, inarticulate brachiopods have weak, untoothed hinges and a more complex system of vertical and oblique (diagonal) muscles used to keep the two valves aligned. In many brachio ...
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Lamp Shells
Brachiopods (), phylum Brachiopoda, are a phylum of animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Two major categories are traditionally recognized, articulate and inarticulate brachiopods. The word "articulate" is used to describe the tooth-and-groove structures of the valve-hinge which is present in the articulate group, and absent from the inarticulate group. This is the leading diagnostic skeletal feature, by which the two main groups can be readily distinguished as fossils. Articulate brachiopods have toothed hinges and simple, vertically oriented opening and closing muscles. Conversely, inarticulate brachiopods have weak, untoothed hinges and a more complex system of vertical and oblique (diagonal) muscles used to keep the two valves aligned. In many brachiopods, a stalk-like ...
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List Of Brachiopod Genera
This is a list of brachiopod genera which includes both Extinction, extinct (fossil) forms and Extant taxon, extant (living) genera (bolded). Names are according to the conventions of the International Code of Zoological Nomenclature. A *''Aalenirhynchia'' *''Aberia (brachiopod), Aberia'' *''Aboriginella'' *''Abrekia'' *''Absenticosta'' *''Abyssorhynchia'' *''Abyssothyris'' *''Acambona'' *''Acanthalosia'' *''Acanthambonia'' *''Acanthatia'' *''Acanthobasiliola'' *''Acanthocosta'' *''Acanthocrania'' *''Acanthoglypha'' *''Acanthoplecta'' *''Acanthoproductus'' *''Acanthorhynchia'' *''Acanthorthis'' *''Acanthospirifer'' *''Acanthospirina'' *''Acanthothyris'' *''Acanthothyropsis'' *''Acanthotoechia'' *''Acareorthis'' *''Acculina'' *''Achunoproductus'' *''Acidotocarena'' *''Acolosia'' *''Acosarina'' *''Acritosia'' *''Acrobelesia'' (fossil per IRMNG) *''Acrobrochus'' *''Acrospirifer'' *''Acrothele'' *''Acrothyra'' *''Acrothyris'' *''Acrotreta'' *''Acrotretella'' *''Actinoconchus'' *''Ac ...
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Silurian
The Silurian ( ) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the third and shortest period of the Paleozoic Era, and the third of twelve periods of the Phanerozoic Eon. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by a few million years. The base of the Silurian is set at a series of major Ordovician–Silurian extinction events when up to 60% of marine genera were wiped out. One important event in this period was the initial establishment of terrestrial life in what is known as the Silurian-Devonian Terrestrial Revolution: vascular plants emerged from more primitive land plants, dikaryan fungi started expanding and diversifying along with glomeromycotan fungi, and three groups of arthropods ( myriapods, arachnids and hexapods) ...
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Paleozoic Life Of The Northwest Territories
The Paleozoic ( , , ; or Palaeozoic) Era is the first of three geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of the Mesozoic Era. The Paleozoic is subdivided into six geologic periods (from oldest to youngest), Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. Some geological timescales divide the Paleozoic informally into early and late sub-eras: the Early Paleozoic consisting of the Cambrian, Ordovician and Silurian; the Late Paleozoic consisting of the Devonian, Carboniferous and Permian. The name ''Paleozoic'' was first used by Adam Sedgwick (1785–1873) in 1838 to describe the Cambrian and Ordovician periods. It was redefined by John Phillips (1800–1874) in 1840 to cover the Cambrian to Permian periods. It is derived from the Greek ''palaiós'' (παλαιός, "old") and ''zōḗ'' (ζωή, "life") meaning "ancient lif ...
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