Wege der Reptiliensystematik

摘要: After a brief review of reptilian systematics from the time ofLinneus to present, those features Sauropterygian and Placodont representatives are examined, which considered systematically important today. A comparison between Sauropterygians Placodonts shows that skull possessed only one temporal opening earliest times, while can be traced form with two openings. Thus, not close relatives. Comparison Synapsids (Pelycosaurs Therapsids) indicates their paths diverged early. Since ofSimosaurus cannot derived any presently known Cotylosaurian skull, it must assumed thatSimosaurus, thus Sauropterygians, developed as an independent line ancestral amphibian forms. In agreement withD. M. S. Watson, Cotylosaurs viewed genetic unit in all lines rooted. contrast toWatson, however, is that, independently Sauropsids Theropsids (which led respectively birds mammals) remaining reptile groups took origins Labyrinthodonts. The “Class” Reptilia natural entity (relationship group) but developmental stage amniotes. It “clade” “grade”. Apres avoir brievement passe en revue l'histoire de la classification des Reptiles deLinne l'epoque actuelle, les caracteres systematiques consideres aujourd'hui comme importants sont verifies sur l'exemple Sauropterygiens et Placodontes. Leur comparaison montre que le crâne Placodontes ne comportait debut qu'une seule fosse temporale, tandis celui peut etre ramene un deux fenetres temporales. pas proches parents. Une Synapsides (Pelycosauriens Therapsides) prouve leurs chemins se deja separes tres tot. Comme on faire deriver deSimosaurus d'aucun Cotylosaurien connu, il faut admettre queSimosaurus par consequence constituent une lignee issue independamment formes amphibiennes. AvecD. nous considerons Cotylosauriens unite genetique, dans laquelle toutes lignees reptiliennes s'enracinent. Contrairement aD. admettons qu'en plus Sauropsides Theropsides, qui menent aux Oiseaux, respectivement Mammiferes, d'autres ont tire leur origine parmi Labyrinthodontes. La classe n'est groupe naturel, mais stade evolutif Amniotes. Elle «clade» «grade».