URI oai:uved.fr:3196.eurypterid-phylogeny-and-the-origin-of-arachnida Eurypterid phylogeny and the origin of Arachnida fre <p>The monophyletic Palaeozoic chelicerate order Eurypterida, contains around 65 genera and is the subject of the first large-scale phylogenetic analysis of the group (201 morphological characters for the entire Chelicerata). Many eurypterids are known from fragmentary remains, and the 40 best-known genera are included in this analysis. The analysis suggests that the two previous models that divide Eurypterida into two suborders—Pterygotina vs. Eurypterina (large vs. small chelicerae) and Eurypterina vs. Stylonurina (sixth appendage developed into swimming legs vs. walking legs)—renders one suborder paraphyletic. The suborder concept is therefore abandoned, but a number of superfamilies and families are recognised. The position of Eurypterida within Chelicerata (excluding Pantopoda) was also analysed and the result suggests Xiphosura is the most basal taxon in Chelicerata. Chasmataspidida are sister-group to Eurypterida + Arachnida. The monophyletic Arachnida has Scorpiones as its most basal taxon, followed by Haplocnemata (Solifugae + Pseudoscorpiones). The remaining higher taxa form a clade where Opiliones is basal, followed by the extinct Phalangiotarbida, Acaromorpha (Acari + Ricinulei), Palpigradi, Anthracomartida, Araneae, the extinct Haptopoda, Amblypygi, Thelyphonida and Schizomida.</p> analyse biodiversité biogéographie climatologie fossile paléobiologie paléoenvironnement paléontologie réchauffement climatique Paléontologie. Paléobotanique. Paléozoologie Climatologie LOMv1.0 collection LOMv1.0 1 LOMFRv1.0 image en mouvement LOMFRv1.0 son LOMFRv1.0 texte v1 LOMv1.0 final LOMv1.0 author BEGIN:VCARD VERSION:3.0 N:;;;; FN:O. Erik Tetlie ORG: EMAIL;TYPE=INTERNET: END:VCARD 2008-01-01 URI oai:uved.fr:3196.eurypterid-phylogeny-and-the-origin-of-arachnida LOMv1.0 creator BEGIN:VCARD VERSION:3.0 N:;;;; FN: ORG:UVED URL:http://www.uved.fr EMAIL;TYPE=INTERNET: END:VCARD 2008-01-01 LOMv1.0 LOMFRv1.0 SupLOMFRv1.0 fre text/html https://webtv.univ-lille.fr/video/2562/eurypterid-phylogeny-and-the-origin-of-arachnida 0 LOMv1.0 lecture LOMv1.0 teacher LOMv1.0 learner LOMFRv1.0 licence 0 fre LOMv1.0 no LOMv1.0 yes Licence Creative Commons : Attribution, Pas d'utilisation commerciale, Partage dans les mêmes conditions LOMv1.0 discipline CDD 22e éd.