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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Arctic Archipelago (1)
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Nunavut (1)
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Queen Elizabeth Islands
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Parry Islands (1)
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Western Canada
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Northwest Territories (1)
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Cornwallis Island (1)
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Europe
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Central Europe
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Czech Republic (1)
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North America
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Basin and Range Province
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Great Basin (1)
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United States
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Great Basin (1)
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Idaho
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Bear Lake County Idaho (1)
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Utah
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Millard County Utah (1)
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Virginia
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Rockingham County Virginia (1)
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Shenandoah County Virginia (1)
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Western U.S. (1)
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fossils
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Invertebrata
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Arthropoda
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Trilobitomorpha
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Trilobita
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Ptychopariida
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Proetidae (1)
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geologic age
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Paleozoic
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Ordovician
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Lower Ordovician
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Fillmore Formation (1)
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Ibexian (1)
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Martinsburg Formation (1)
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Upper Ordovician (1)
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Silurian
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Lower Silurian
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Wenlock
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Homerian (1)
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Upper Silurian
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Ludlow (1)
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Primary terms
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Canada
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Arctic Archipelago (1)
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Nunavut (1)
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Queen Elizabeth Islands
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Parry Islands (1)
-
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Western Canada
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Northwest Territories (1)
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-
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Europe
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Central Europe
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Czech Republic (1)
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-
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Invertebrata
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Arthropoda
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Trilobitomorpha
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Trilobita
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Ptychopariida
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Proetidae (1)
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-
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-
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North America
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Basin and Range Province
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Great Basin (1)
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-
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Paleozoic
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Ordovician
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Lower Ordovician
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Fillmore Formation (1)
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Ibexian (1)
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Martinsburg Formation (1)
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Upper Ordovician (1)
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Silurian
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Lower Silurian
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Wenlock
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Homerian (1)
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-
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Upper Silurian
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Ludlow (1)
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-
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United States
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Great Basin (1)
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Idaho
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Bear Lake County Idaho (1)
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Utah
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Millard County Utah (1)
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Virginia
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Rockingham County Virginia (1)
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Shenandoah County Virginia (1)
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Western U.S. (1)
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Rorringtoniidae
A new rorringtoniid trilobite from the Ludlow of Arctic Canada
AULACOPLEURID TRILOBITES FROM THE UPPER ORDOVICIAN OF VIRGINIA
Bearriverops , a new Lower Ordovician trilobite genus from the Great Basin, western USA, and classification of the family Dimeropygidae
Size, shape, and systematics of the Silurian trilobite Aulacopleura koninckii
A synopsis of Ordovician trilobite distribution and diversity
Abstract Ordovician trilobites are reviewed based on a new species-level relational database. The stratigraphical ranges of all 56 families with occurrences in the Ordovician are documented and the content, phylogenetic status, diversity and Ordovician distribution by major palaeocontinent/terrane are discussed. Aspects of higher classification are also dealt with. Global sampling is heavily biased towards a small number of highly sampled areas. Much of the world has a very limited record of formally named trilobite species. Even within heavily sampled units, sampling is patchy by environment and time. Genus endemism was at a peak in Laurentia, Baltic, and Avalonia in the Floian and declined more-or-less steadily through the remainder of the Ordovician.