Topic. These two groups did not survive the end of the Triassic period, but the most famous group of archosauromorphs not only survived, but have continued to diversify and dominate beyond the Triassic-Jurassic extinction. [2], The lower temporal fenestra is not fully enclosed in early archosauromorphs (and choristoderes) due to alterations to the structure of the quadratojugal bone at the rear lower corner of the skull. Some geneticists have proposed a name to refer to reptiles within the group formed by relatives of turtles and archosaurs. [2] The transverse processes (rib facets) of these vertebrae extend outwards to a greater extent than in other early reptiles. [8] Likewise, Pamelaria is now considered an allokotosaur, Macrocnemus is a tanystropheid, and Protorosaurus may be too basal ("primitive") to form a clade with any of its supposed close relatives. Protorosauria/Prolacertiformes has had a complicated history, and many taxa have entered and left the group as paleontologists discover and re-evaluate reptiles of the Triassic. The presence of a calcaneal tuber (sometimes known as a lateral tuber of the calcaneum) is a synapomorphy of the group Crocopoda, and is also responsible for its name. Schwestergruppe der Lepidosauromorpha sind die Archosauromorpha. .mw-parser-output table.clade{border-spacing:0;margin:0;font-size:100%;line-height:100%;border-collapse:separate;width:auto}.mw-parser-output table.clade table.clade{width:100%;line-height:inherit}.mw-parser-output table.clade td.clade-label{width:0.7em;padding:0 0.15em;vertical-align:bottom;text-align:center;border-left:1px solid;border-bottom:1px solid;white-space:nowrap}.mw-parser-output table.clade td.clade-fixed-width{overflow:hidden;text-overflow:ellipsis}.mw-parser-output table.clade td.clade-fixed-width:hover{overflow:visible}.mw-parser-output table.clade td.clade-label.first{border-left:none;border-right:none}.mw-parser-output table.clade td.clade-label.reverse{border-left:none;border-right:1px solid}.mw-parser-output table.clade td.clade-slabel{padding:0 0.15em;vertical-align:top;text-align:center;border-left:1px solid;white-space:nowrap}.mw-parser-output table.clade td.clade-slabel:hover{overflow:visible}.mw-parser-output table.clade td.clade-slabel.last{border-left:none;border-right:none}.mw-parser-output table.clade td.clade-slabel.reverse{border-left:none;border-right:1px solid}.mw-parser-output table.clade td.clade-bar{vertical-align:middle;text-align:left;padding:0 0.5em;position:relative}.mw-parser-output table.clade td.clade-bar.reverse{text-align:right;position:relative}.mw-parser-output table.clade td.clade-leaf{border:0;padding:0;text-align:left}.mw-parser-output table.clade td.clade-leafR{border:0;padding:0;text-align:right}.mw-parser-output table.clade td.clade-leaf.reverse{text-align:right}.mw-parser-output table.clade:hover span.linkA{background-color:yellow}.mw-parser-output table.clade:hover span.linkB{background-color:green}, The following cladogram is based on a large analysis of archosauriforms published by M.D. However, in other allokotosaurs, the basal rhynchosaur Mesosuchus, and more crownward archosauromorphs, the sagittal crest is weakly differentiated, although the inner edge of each supratemporal fenestra still possessed a depressed basin of bone known as a supratemporal fossa. Die entsprechende Schwestergruppe der Archosauromorpha sind die Lepidosauromorpha. [16] In all adult archosauromorphs with the exception of Aenigmastropheus, the vertebrae lack notochordal canals, holes which perforate the centra. Many rhynchosaurs had highly modified skulls, with beak-like premaxillary bones and wide heads. A few advanced archosauriforms reacquired the plesiomorphic ("primitive") state present in other reptiles, that being a short or absent posterodorsal process of the premaxilla, with the rear edge of the nares formed primarily by the maxilla bones instead. Ezcurra (2016) argued that presence of supratemporal fossae and an absence or poor development of the sagittal crest could be used to characterize Crocopoda. However, there was little consensus on ancient reptile relationships prior to the late 20th century, so the term Archosauromorpha was seldom used until many years after its creation. In conjunction with this shift, the olecranon process of the ulna is poorly developed in archosauromorphs apart from Aenigmastropheus and Protorosaurus. Another group of archosauromorphs has traditionally been represented by Trilophosaurus, an unusual iguana-like herbivorous reptile quite different from the rhynchosaurs. Schwestergruppe der Lepidosauromorpha sind die Archosauromorpha. Although choristodere fossils are only known from the Jurassic through the Miocene, it is theorized that they first appeared during the Permian alongside the earliest archosauromorphs. Although Archosauromorpha was first named in 1946, its membership did not become well-established until the 1980s. However, they are also known to occur in the bizarre semiaquatic reptile Helveticosaurus,[3] as well as the biarmosuchian synapsid Hipposaurus. The centrum (main body) of each vertebra is parallelogram-shaped, with a front surface typically positioned higher than the rear surface. The Archosauromorpha, including Archosauriformes. Trias ist ein Tier, das wir bereits mehrmals im Blog erwähnt haben, bekannt als … Lepidosauromorphs are distinguishable from Archosauromorphs (archosaurs) by their primitive sprawling gait, which allows for the same sinusoidal trunk and tail movement seen in fish, the sliding "joint" between the coracoids and the sternum (for a longer stride), and their pleurodont dentition. [11][12] If this evidence is accurate, then turtles are part of basal Archosauromorpha. Since the seminal studies of the 1980s, Archosauromorpha has consistently been found to contain four specific reptile groups, although the definitions and validity of the groups themselves have been questioned. Other notable genera include Boreopricea, Pamelaria, and Macrocnemus, as well as strange gliding reptiles such as Sharovipteryx and Mecistotrachelos. Unter der Annahme, dass die Schildkröten (Testudines) keine unabhängige Linie der Reptilienevolution darstellen und entweder den Lepidosauromorpha oder den Archosauromorpha zuzurechnen sind, bilden diese beiden Großgruppen die Reptilien-Kronengruppe. Archosauromorpha Lepidosauromorpha Subgroups; Squamata Lepidosauromorpha Lizards, snakes, Sphenodon, and their extinct relatives . [citation needed]. In many long-necked archosauromorphs, the rib facets are slanted, connecting to cervical ribs that are often long, thin, and dichocephalous (two-headed). Laminae are practically unique to archosauromorphs, being present even in the earliest Permian genera such as Aenigmastropheus and Eorasaurus. Cladistic analyses created during the 1980s by Gauthier, Michael J. Benton, and Susan E. Evans implemented Gauthier's classification scheme within large studies of reptile relations. Avemetatarsalia). Currently Archosauromorpha encompasses four main groups of reptiles: the stocky, herbivorous allokotosaurs and rhynchosaurs, the hugely diverse Archosauriformes, and a polyphyletic grouping of various long-necked reptiles including Protorosaurus, tanystropheids, and Prolacerta. [2] Archosauromorphs first appeared during the middle Permian, though they became much more common and diverse during the Triassic period.[3]. [9] This study found that Azendohsauridae, Triassic reptiles previously mistaken for "prosauropod" dinosaurs, were in fact close relatives of Trilophosaurus and the rest of Trilophosauridae. Other groups including pantestudines (turtles and their extinct relatives) and the semiaquatic choristoderes have also been placed in Archosauromorpha by some authors.