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Paradoxididae
The Paradoxididae are a family of trilobites, a group of extinct marine arthropods. They occurred during the late Lower Cambrian (Toyonian) and disappeared at the end of the Middle Cambrian. Representatives of this family have been found in the paleocontinents of Avalonia, Baltica, and Gondwana, now Canada (Nova-Scotia, New Brunswick, Newfoundland), USA (Massachusetts, South Carolina), England, Wales, Morocco, Spain, Czech Republic, Poland, Russia (Novaya Zemlya, Northern Siberia, North-East Yakutia), Mongolia, and Turkey. Species in this family can typically grow large to very large (over 30 cm), are relatively flat, have an inverted egg-shaped outline, opisthoparian sutures, a glabella that in early genera has parallel sides and expands forward in later representatives, and approaches or reaches the frontal border. All species have an almost semicircular headshield (or cephalon) with long backward-directed genal spines. The articulate middle part of the body (or thorax) con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paradoxidoidea
The Paradoxidoidea Hawle & Corda 1847,HAWLE, J. & CORDA, A. J. C. 1847. ''Prodrom einer Monographieder bohmischen Trilobiten''. 176 pp. J. G. Calve, Prague are a superfamily of trilobites, a group of extinct marine arthropods. They occurred during the late Lower Cambrian (Toyonian) and disappeared at the end of the Middle Cambrian. Description Species in this superfamily can be average (under 10 cm) to very large (over 30 cm), are relatively flat, have an inverted egg-shaped outline, a glabella that in early genera has parallel sides and expands forward in later representatives, and approaches or reaches the frontal border. All species have an almost semicircular headshield (or cephalon) with long backward directed genal spines. The facial suture in front of the eye diverges forward and outward in the Paradoxididae, while in the Centropleuridae it runs outward and even a bit backward (or retrodivergent). The articulate middle part of the body (or thorax) consists of 14 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acadoparadoxides
''Acadoparadoxides'' is an extinct genus of redlichiid trilobite belonging to the family Paradoxididae The Paradoxididae are a family of trilobites, a group of extinct marine arthropods. They occurred during the late Lower Cambrian ( Toyonian) and disappeared at the end of the Middle Cambrian. Representatives of this family have been found in th .... These fast-moving low-level epifaunal carnivores lived in the Middle Cambrian (abt 500 Ma). Selected species The following species have been described: References Redlichiida genera Paradoxidoidea Cambrian trilobites Prehistoric life of Europe Fossil taxa described in 1957 {{Redlichiida-stub Cambrian genus extinctions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anabaraspis
''Anabaraspis'' is a genus of redlichiid trilobite. ''A. splendens'' occurs in the uppermost Lower Cambrian and lowest Middle Cambrian of Russia (Toyonian and lower Amgan, ''A. splendens'' and ''Oryctocara'' Zones, northwestern and southeastern Yakutia). In ''Anabaraspis'' there is a long area in front of the glabella which is not differentiated in a border and a preglabellar field. This is a unique character in the family Paradoxididae. The frontal lobe of the central raised area (or glabella) of the headshield (or cephalon) is slightly pointed, rather than rounded or truncate, a character shared with ''Plutonides'', though, in ''Plutonides'' it hangs over the short anterior border. Description The exoskeleton of ''Anabaraspis'' is relatively flat, oval to inverted egg-shaped. The glabella subpentagonal with a blunt frontal tip, and widest near the back of the frontal lobe. The glabella is divided into three rings by furrows that cross the midline, although the most frontal of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plutonides
''Plutonides'' is a genus of Middle Cambrian trilobite in the family Paradoxididae with species ''Plutonides sedgwickii'' and possibly ''Plutonides? illingi''. Several other species and subspecies were at times placed in ''Plutonides'' but have subsequently been moved to other genera. In terms of the Scandinavian Middle Cambrian sequence the genus ranges from the ''Baltoparadoxides oelandicus'' Biosuperzone (''B. pinus'' Biosubzone) at the type locality for ''P. sedwickii'' on Trwyncynddeiriog headland located south-southwest of St David’s Cathedral and east of Porth Clais Harbour - Pen-y-Cyfrwy Member, Newgale Formation, and possibly to middle part of the ''Mawddachites hicksii'' Biozone on the Penpleidiau (eastern) Headland of Caerfai Bay south of St David’s in southwest Wales, where ''P? illingi'' occurs ocs. TC-1 & CF-1 of Rees ''et al.''ref name="Rees2014"/> Type ''Plutonia sedgwickii'' is the type species for the genus and was first described in 1871 as ''"Plutonia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schoriina
''Schoriina'' is a genus of trilobite, an extinct group of marine arthropod Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a Segmentation (biology), segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and Arth ...s. The only known species is ''S. elegans''. References Cambrian trilobites Paradoxidoidea Fossils of Russia Fossil taxa described in 1971 {{redlichiida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bajanaspis
''Bajanaspis'' is a genus of trilobites that has been found in the Edreisk Formation, Kazakhstan, belonging to the Lower Cambrian The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million .... References Cambrian trilobites of Asia Paradoxidoidea Fossils of Kazakhstan Fossil taxa described in 1978 {{Redlichiida-stub Cambrian genus extinctions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrocephalus (trilobite)
''Hydrocephalus'' ("water head") is an extinct genus of redlichiid trilobite that was very common during the Middle Cambrian of Eurasia and North America, which lasted from 508 to 497 million years ago. This trilobite is up to 20 cm long and more widely built than others of the time. In comparison to other members of its family, its glabella appears swollen. Gallery File:Hydrocephalus-minor-01.jpg, ''Hydrocephalus minor'' from Jince (Czech Republic The Czech Republic, or simply Czechia, is a landlocked country in Central Europe. Historically known as Bohemia, it is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. The ...) File:Hydrocephalus librigena Skrye.jpg, Free cheek of ''H. carens'', 33mm between the tips File:Estonian Museum of Natural History - trilobite - Hydrocephalus.png, 3D model References Redlichiida genera Cambrian trilobites Paradoxidoidea Fossils of the Czech Republic F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Primoriella
''Primoriella'' is a genus of trilobite, an extinct group of marine arthropods. The only known species, ''P. bella'' occurs in the uppermost Lower Cambrian of Russia (''Redlichina culmenica'' beds, far eastern Siberia). It is related to ''Paradoxides'', but can be distinguished from it by only slightly forward expansion of the (glabella) a character shared with '' Anabaraceps'' and '' Schagonaria''. In ''Primoriella'' however, the front of the glabella touches the roll-like border, causing it to slightly bulge forward, while in ''Anabaraceps'' there is a roll-like preglabellar field as wide as the flat border in front of it. The glabella of ''Primordiella'' is less than twice as long as wide, and differs from ''Schagonaria'' in which it is more than twice as long as wide. The thorax The thorax or chest is a part of the anatomy of humans, mammals, and other tetrapod animals located between the neck and the abdomen. In insects, crustaceans, and the extinct trilobites, the tho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schagonaria
''Schagonaria'' is a genus of trilobite, an extinct group of marine arthropods. The only known species, ''S. tannuola'' occurs in the earliest Middle Cambrian of Russia (Amgaian, Ulukhema River, Tuva Region). It is related to ''Paradoxides'', but can be distinguished from it by only slightly forward expansion of the glabella, a character shared with '' Anabaraceps'' and ''Primoriella''. In ''Primoriella'' the front of the glabella touches the roll-like border, causing it to slightly bulge forward, in ''Anabaraceps'' there is a roll-like preglabellar field as wide as the flat border in front of it, but in ''Schagonaria'' the glabella may or may not touch the frontal border, but neither the border, nor if present the preglabellar field is particularly convex. The glabella of ''Schagonaria'' is more than twice as long as wide, and differs from ''Primordiella'' in which it is less than twice as long as wide. The articulate middle part of the body (or thorax The thorax or chest i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltica
Baltica is a paleocontinent that formed in the Paleoproterozoic and now constitutes northwestern Eurasia, or Europe north of the Trans-European Suture Zone and west of the Ural Mountains. The thick core of Baltica, the East European Craton, is more than three billion years old and formed part of the Rodinia supercontinent at 1 . Tectonic history Baltica formed at 2.0–1.7 Ga by the collision of three Archaean-Proterozoic continental blocks: Fennoscandia (including the exposed Baltic Shield), Sarmatia (Ukrainian Shield and Voronezh Massif), and Volgo-Uralia (covered by younger deposits). Sarmatia and Volgo-Uralia formed a proto-craton (sometimes called "Proto-Baltica") at c. 2.0 Ga which collided with Fennoscandia c. 1.8–1.7 Ga. The sutures between these three blocks were reactivated during the Mesoproterozoic and Neoproterozoic. 750–600 million years ago, Baltica and Laurentia rotated clockwise together and drifted away from the Equator towa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gondwana
Gondwana () was a large landmass, often referred to as a supercontinent, that formed during the late Neoproterozoic (about 550 million years ago) and began to break up during the Jurassic period (about 180 million years ago). The final stages of break-up, involving the separation of Antarctica from South America (forming the Drake Passage) and Australia, occurred during the Paleogene. Gondwana was not considered a supercontinent by the earliest definition, since the landmasses of Baltica, Laurentia, and Siberia were separated from it. To differentiate it from the Indian region of the same name (see ), it is also commonly called Gondwanaland. Gondwana was formed by the accretion of several cratons. Eventually, Gondwana became the largest piece of continental crust of the Palaeozoic Era, covering an area of about , about one-fifth of the Earth's surface. During the Carboniferous Period, it merged with Laurasia to form a larger supercontinent called Pangaea. Gondwana (and Pan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobite
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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