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Thylacocephala (Arthropoda) from the Lower Triassic of Chaohu, China
Ankitokazocaris chaohuensis. scale bars equal 5 mm
Thylacocephala, though only been recognized for 25 years, has been considered a peculiar group worthy of detailed anatomical and phylogenetic studies. They are benthic arthropods showing large, laterally flattened ovoid/sub-trapezoidal b... |
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New progress on the study of clam shrimps from Yanji Basin
Clam shrimp Ordosestheria multicostata
Clam shrimps (conchostracans) are freshwater branchiopod crustaceans with a hinged chitinous or complex chitin-mineral carapace. They are known in the fossil record from the Devonian to recent. Since the Pennsylvanian, clam shrimps have been an impo... |
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What caused the biological mass extinctions?
Although a majority of biologists are convinced that a mass extinction is underway on earth today, the human history with direct observatory data is too short to predict its future trend. At least five great mass extinctions occurred during the Phanerozoic and they caused at least 75% marine... |
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