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The Artiopoda is a grouping of extinct arthropods that includes trilobites and their close relatives. It was erected by Hou and Bergström in 1997 [4] to encompass a wide diversity of arthropods that would traditionally have been assigned to the Trilobitomorpha. Trilobites, in part due to abundance of findings owing to their mineralized ...
Arthropod eyes Head of a wasp with three ocelli (center), and compound eyes at the left and right. Most arthropods have sophisticated visual systems that include one or more usually both of compound eyes and pigment-cup ocelli ("little eyes"). In most cases, ocelli are only capable of detecting the direction from which light is coming, using ...
From after the Second World War to the 1980s a commonly accepted model of arthropod evolution was that the extant euarthropods were polyphyletic, i.e. the main lineages had evolved independently from soft-bodied, annelid-like ancestors, following the work of Tiegs and especially Sidnie Manton. In this view, most of the head structures would ...
The evolutionary ancestry of arthropods dates back to the Cambrian period. The group is generally regarded as monophyletic, and many analyses support the placement of arthropods with cycloneuralians (or their constituent clades) in a superphylum Ecdysozoa. Overall, however, the basal relationships of animals are not yet well resolved. Likewise ...
However, the Hox1-5 genes were already present in ancestral arthropods and vertebrates that did not have complex head structures. The Hox genes therefore most likely assisted in cephalization of these two bilaterian groups independently by convergent evolution, resulting in similar gene networks. [18]
Arthropods portal; Euthycarcinoidea, a group of enigmatic arthropods that may be ancestral to myriapods; Colonization of land, major evolutionary stages leading to terrestrial organisms; Metamerism, the condition of multiple linearly repeated body segments
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