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Trinucleidae
Trinucleidae is a family of small to average size asaphid trilobites that first occurred at the start of the Ordovician and became extinct at the end of that period. It contains approximately 227 species divided over 51 genera in 5 subfamilies. The most conspicuous character is the wide perforated fringe of the head. Description Trinucleids have a relatively large headshield, that is characterized by a highly vaulted pear-shaped glabella, separated by deep furrows from the cheeks that are often vaulted too, but less so. To the front and sides of this tri-nucleate centre is a wide seam (or fringe), that often inclinates towards the outer margin, and is perforated by funnel shaped pits. These pits are only in one row at the front in the first occurring genera, irregularly distributed in early species, but in later species these are largely arranged in several rows parallel to the margin, and in arches more or less perpendicular to the margin. The thorax consists of six short but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deanaspis
''Deanaspis'' is a genus of asaphida, asaphid trilobites in the family Trinucleidae in the Ordovician periods. It is reported only from Northern Europe and Iran. It was named as a new genus in 1975. In 2025, a member of the Galeaspida was given the same genus name ("Deanaspis" longpingi, "''Deanaspis''" ''longpingi''), with a replacement name yet to be chosen. References Trinucleidae Asaphida genera Ordovician trilobites of Europe Ordovician trilobites of Asia Fossil taxa described in 1975 {{Asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bettonolithus
Bettonolithus is a genus of trilobites of the Order Asaphida. It is in the family Trinucleidae. Fossil specimens have been found in the Lower Ordovician rocks of Gilwern Hill in Powys, Wales. This trilobite was blind but anatomical evidence suggests it sifted organic matter on the seabed The seabed (also known as the seafloor, sea floor, ocean floor, and ocean bottom) is the bottom of the ocean. All floors of the ocean are known as seabeds. The structure of the seabed of the global ocean is governed by plate tectonics. Most of .... References Trinucleidae Asaphida genera Fossils of Great Britain Ordovician trilobites {{Asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptolithus
''Cryptolithus'' is a genus of extinct epifaunal, suspension-feeding, trinucleid trilobites that lived during the Ordovician period. They were mostly blind. They are found in the United States, Canada, Venezuela, the United Kingdom, France, the Czech Republic, Morocco and Turkey. Species Valid species of ''Cryptolithus'' include: * '' Cryptolithus bellulus'' (Ulrich, 1879) * '' Cryptolithus carimatus'' * '' Cryptolithus fittsi'' (Ulrich & Whittington) * '' Cryptolithus goldfussi'' ( Barrande) * ''Cryptolithus inopinatus'' (Whittard) * '' Cryptolithus intertetus'' (Whittard) * '' Cryptolithus lorerainensis'' (Ruedemann) * '' Cryptolithus lorettensis'' ( Foerste, 1924) * '' Cryptolithus ornatus'' (Sternberg) * '' Cryptolithus portlockii'' ** '' Cryptolithus portlockii girvanensis'' * '' Cryptolithus quadrillatus'' * '' Cryptolithus recurvus'' (Ulrich, 1919) * '' Cryptolithus tessellatus'' (Green Green is the color between cyan and yellow on the visible spectrum. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Costonia
''Costonia'' is a genus of trilobites in the family Trinucleidae. The species ''C. elegans'' is from the Ordovician of South Shropshire Shropshire (; abbreviated SalopAlso used officially as the name of the county from 1974–1980. The demonym for inhabitants of the county "Salopian" derives from this name.) is a Ceremonial counties of England, ceremonial county in the West M ..., England. See also * List of trilobite genera References External links * * ''Costonia''at insectoid.info Trinucleidae Asaphida genera {{Asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broeggerolithus
''Broeggerolithus'' is a genus of the family Trinucleidae in the Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ... periods. It is reported only from Northern Europe. References Trinucleidae Fossil taxa described in 1935 Ordovician trilobites of Europe {{Asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Furcalithus
''Furcalithus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period, a faunal stage In chronostratigraphy, a stage is a succession of rock strata laid down in a single age on the geologic timescale, which usually represents millions of years of deposition. A given stage of rock and the corresponding age of time will by conven ... which lasted from approximately 478 to 471 million years ago. References Trinucleidae Asaphida genera Ordovician trilobites Fossils of Great Britain {{Asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Famatinolithus
''Famatinolithus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period, a faunal stage In chronostratigraphy, a stage is a succession of rock strata laid down in a single age on the geologic timescale, which usually represents millions of years of deposition. A given stage of rock and the corresponding age of time will by conven ... which lasted from approximately 478 to 471 million years ago. References Trinucleidae Asaphida genera Ordovician trilobites of South America Fossils of Argentina {{Asaphida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anebolithus
''Anebolithus'' is a genus of trilobites found in Gilwern Hill, Powys, Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic .... ''Anebolithus'', like other trinucleids, was blind. References Trinucleidae Asaphida genera Fossils of Great Britain Fossils of Wales Powys {{Wales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asaphida
Asaphida is a large, morphologically diverse order of trilobites found in marine strata dated from the Middle Cambrian until their extinction during the Silurian. Asaphida contains six superfamilies (Anomocaroidea, Asaphoidea, Cyclopygoidea, Dikelocephaloidea, Remopleuridoidea and Trinucleioidea), but no suborders. Asaphids comprise some 20% of described fossil trilobites. In 2020, the superfamily Trinucleioidea was proposed to be raised to an order ( Trinucleida) and removed from Asaphida. Morphology The Asaphids generally have cephalon (head) and pygidium (tail) parts similar in size, and most species have a prominent median ventral suture. Heads are often flat, and carapace furrows in the head area are often faint or not visible. Thoracic segments typically number 5 - 12, though some species have as few as two and some as many as 30. They also generally have a wide doublure, or rim, that surrounds the cephalon. This causes some specimens to be described as having a chara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avalonia
Avalonia was a microcontinent in the Paleozoic era. Crustal fragments of this former microcontinent are terranes in parts of the eastern coast of North America: Atlantic Canada, and parts of the East Coast of the United States, East Coast of the United States. In addition, terranes derived from Avalonia also make up portions of Northwestern Europe, being found in England, Wales and parts of Ireland. Avalonia developed as a volcanic arc on the northern margin of Gondwana. It eventually rifted off, becoming a drifting microcontinent. The Rheic Ocean formed behind it, and the Iapetus Ocean shrank in front. It collided with the continents Baltica, then Laurentia. The Armorican terrane, Armorican Terrane assemblage collided with the merged Baltica/Avalonia during the formation of Pangea. When Pangea broke up, Avalonia's remains were divided by the rift which became the Atlantic Ocean. Avalonia is named for the Avalon Peninsula in Newfoundland (island), Newfoundland. When the term "A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
