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Bradoriids
Bradoriida, also called bradoriids, are an extinct order of small marine arthropods with a bivalved carapace, which globally distributed, forming a significant portion of the Cambrian and Early Ordovician soft-bodied communities. Affinity Whilst the Bradoriida were traditionally considered as relatives of the modern bivalved arthropod group Ostracoda, the anatomy of their appendages does not support such a relationship; neither are they related to the Cambrian bivalved arthropod group Phosphatocopina. They have been alternatively recovered as stem-group crustaceans, as stem-group mandibulates, or stem-group arthropods, depending on the analysis. Description Most bradoriids are only known from their bivalved carapaces, which are small in size, typically up to around in length. Preserved soft tissues known from some members, such as '' Kunmingella, Kunyangella'' and ''Indiana'' suggest that the group was morphologically diverse. ''Indiana'' had a pair of antennae followed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kunmingella
''Kunmingella'' is genus of Cambrian bradoriid from the Chengjiang biota, containing the single species ''K. douvillei''. ''Kunmingella'' had 12 appendages, including a pair of antennae as well pairs of biramous limbs, including four anterior pairs of appendages bearing double rows of endites on their endopods, and a posterior 5 with only a single row of endites, as well as two terminal pairs of uniramous limbs. Eggs have been found preserved attached to the posteriormost three pairs of biramous limbs, suggesting it engaged in brood care. Around 50–80 eggs, each around 150–180 μm across were attached in total. See also * Arthropod * Cambrian explosion * Chengjiang biota ** List of Chengjiang Biota species by phylum This is a list of fossils found at Maotianshan Shales, whose most famous assemblage of organisms are referred to as the Chengjiang biota. The Maotianshan Shales are a series of Cambrian, Early Cambrian Shale, sedimentary deposits in the Chiungch ... Referenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mongolitubulus
''Mongolitubulus'' is a form genus encapsulating a range of ornamented conical small shelly fossils of the Cambrian, Cambrian period. It is potentially synonymous with ''Rushtonites'', ''Tubuterium'' and certain species of ''Rhombocorniculum'', and owing to the similarity of the genera, they are all dealt with herein. Organisms that bore ''Mongolitubulus''-like projections include trilobites, bradoriid arthropods and hallucigeniid lobopodians. Morphology The fossils consist of round, slender, pointed, spines with a slight curvature, and are covered with short rhomboid processes that spiral around the spine surface, forming a regular mosaic with a 60° angle of intersection. Spines vary from sub-millimetric up to two centimetres in length, but do not show any growth lines, suggesting that they were moulted and replaced. Species are defined on the basis of the ornamentation, which may of course be convergent evolution, convergent. Spines of ''Rhombocorniculum cancellatum'' have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maotianshan Shales
The Maotianshan Shales () are a series of Early Cambrian sedimentary deposits in the Chiungchussu Formation or Heilinpu Formation, famous for their '' Konservat Lagerstätten'', deposits known for the exceptional preservation of fossilized organisms or traces. The Maotianshan Shales form one of some forty Cambrian fossil locations worldwide exhibiting exquisite preservation of rarely preserved, non-mineralized soft tissue, comparable to the fossils of the Burgess Shale of British Columbia, Canada. They take their name from Maotianshan Hill () in Chengjiang County, Yunnan Province, China. The most famous assemblage of organisms are referred to as the Chengjiang biota for the multiple scattered fossil sites in Chengjiang. The age of the Chengjiang Lagerstätte is locally termed Qiongzhusian, a stage correlated to the late Atdabanian Stage in Siberian sequences of the middle of the Early Cambrian. The shales date to ≤. Along with the Burgess Shale, the Maotianshan Shales ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indiana (genus)
Indiana ( ) is a state in the Midwestern region of the United States. It borders Lake Michigan to the northwest, Michigan to the north and northeast, Ohio to the east, the Ohio River and Kentucky to the south and southeast, and the Wabash River and Illinois to the west. Nicknamed "the Hoosier State", Indiana is the 38th-largest by area and the 17th-most populous of the 50 states. Its capital and largest city is Indianapolis. Indiana was admitted to the Union as the 19th state on December 11, 1816. Indigenous resistance to American settlement was broken with defeat of the Tecumseh's confederacy in 1813. The new settlers were primarily Americans of British ancestry from the eastern seaboard and the Upland South, and Germans. After the Civil War, in which the state fought for the Union, natural gas attracted heavy industry and new European immigrants to its northern counties. In the first half of the 20th century, northern and central sections experienced a boom in goods m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comptaluta
''Comptaluta'' is an extinct genus of Cambrian bradoriid arthropod. The genus was erected by Armin Öpik, who described ''C. calcarata'' and ''C. profunda'' from the Ordian of Australia. Two further species have been described from the Chengjiang biota: ''C. kailiensis'' and ''C. inflata''. See also * Cambrian explosion * List of Chengjiang Biota species by phylum This is a list of fossils found at Maotianshan Shales, whose most famous assemblage of organisms are referred to as the Chengjiang biota. The Maotianshan Shales are a series of Cambrian, Early Cambrian Shale, sedimentary deposits in the Chiungch ... References Cambrian animals Maotianshan shales fossils Prehistoric arthropod genera Cambrian genus extinctions {{paleo-arthropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
