WebOne of the most successful yet least-often depicted group of Mesozoic reptiles are the choristoderes. Despite lasting from the Middle Jurassic all the way to the Late Oligocene, and being found across most of Eurasia and North America, these animals are nowhere near as famous as many of their contemporaries. WebBecause crocodilians and dinosaurs share a common ancestor with choristoderes and also care for their young, it may be that this behavior is the ancestral condition in all reptiles. In “Mystery of the Lost Reptiles,” paleontologist Daniel T. Ksepka writes about this diverse and long-overlooked group of aquatic reptiles, and explores why ...
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WebChoristoderes are a group of extinct freshwater reptiles that were distributed throughout Laurasia from the Middle Jurassic to the Miocene. They are inferred to have had a lifestyle similar to that of extant gavialid crocodiles, but they differed from crocodiles in retaining an extensive palatal dentition. Choristoderes are exclusively found in freshwater deposits, often associated with turtles, fish, frogs, salamanders and crocodyliformes. They appear to have been almost exclusively found in warm temperate climates, with the range of neochoristoderes extending to the high Canadian Arctic during … See more Choristodera (from the Greek χωριστός chōristos + δέρη dérē, 'separated neck' ) is an extinct order of semiaquatic diapsid reptiles that ranged from the Middle Jurassic, or possibly Triassic, to the late Miocene (168 … See more Choristoderes vary substantially in size, the smallest genera like Cteniogenys and Lazarussuchus had a length of only around 30 cm (12 in), and the largest known choristoderan, Kosmodraco dakotensis is estimated to have had a total length of around 5 m (16 ft). See more Choristoderes are universally agreed to be members of Neodiapsida, but their exact placement in the clade is uncertain, due to their mix of primitive and derived features, and a long See more • de Braga M, Rieppel O (1997). "Reptile phylogeny and the interrelationships of turtles". Zoological Journal of the Linnean Society. 120 (3): 281–354. doi:10.1111/j.1096-3642.1997.tb01280.x. • Erickson BR (1972). The Lepidosaurian Reptile … See more Choristodera was erected in 1876, originally as a suborder of Rhynchocephalia by Edward Drinker Cope to contain Champsosaurus, which was described from See more Choristoderes must have diverged from all other known reptile groups prior to the end of the Permian period, over 250 million years ago, based on their primitive phylogenetic … See more
WebSep 30, 2024 · These choristoderes were semi-aquatic, sharing their environments with dinosaurs for around 110 million years. There are seven valid species within this group. The literal meaning of Champsosaurus is crocodile-lizard. The Choristoderes group has evolved throughout history. In which geological period did the Champsosaurus roam the earth? WebArchosauromorpha ( Greek for "ruling lizard forms") is a clade of diapsid reptiles containing all reptiles more closely related to archosaurs (such as crocodilians and dinosaurs, including birds) rather than lepidosaurs (such as tuataras, lizards, and snakes ). [1] Archosauromorphs first appeared during the late Middle Permian or Late Permian ...
WebSep 1, 2024 · Choristoderes were most taxonomically and morphologically diverse during the Early Cretaceous: seven of the eleven unquestionably valid choristoderan genera (Hyphalosaurus Gao, Tang et Wang, 1999, Shokawa Evans, Manabe, 1999, Khurendukhosaurus Sigogneau-Russell, Efimov, 1984, Monjurosuchus Endo, 1940, … WebChoristoderes, sometimes informally called champsosaurs, are a clade of semiaquatic diapsids with an extremely long stratigraphic range. The first choristoderes were described in the late 1800s, but until the early 1990s they were only known from the Upper Cretaceous and Paleocene of North America and Europe, a span of about 15 million years.
WebMay 15, 2008 · Choristoderes share no convincing synapomorphies with either Lepidosauromorpha or Archosauromorpha, but occupy a more basal position within Diapsida, possibly as a sister-taxon with Neodiapsida (Younginiformes + Sauria). Reptilia, Diapsida, Choristodera, Cretaceous and Palaeocene, Canada, taxonomy and phylogeny.
WebChoristodera is an unusual linage of diapsid sauropsids. Having evolved in the late Triassic, at the very end of the reptilian radiation that preceeded the reign of the dinosaurs, these animals diversified as aquatic animals. stray act 1985WebCoeruleodraco is an extinct genus of choristoderan known from the Late Jurassic ( Oxfordian) Tiaojishan Formation in China. Coeruleodraco is significant as the most complete Jurassic choristodere taxon, as the only other named Jurassic choristodere Cteniogenys is based on fragmentary remains. roush apparelWebAug 25, 2024 · A selection of neodiapsid reptiles known as choristoderes, to scale. Modern crocodylians dominate the predator niche in freshwater/estuarine environments. They did not always have it to themselves with other groups regularly filling a similar role (see also Copy-crocs 1 - Phytosaurs ). straya countryWebChampsosaurus was derived from a sister to the Doswellia and was a sister to other choristoderes, such as Cteniogenys and Lazarussuchus. This group must have originated in the Late Permian or Early Triassic, but fossils are chiefly from late survivors, hence the wide variety in their morphology. stray action deernessWebJan 1, 2010 · Choristoderes are a group of extinct aquatic-to-semiaquatic diapsid reptiles, with a fossil record from the Middle Jurassic (Evans 1990) to Early Miocene (Evans and Klembara 2005). They were... stray adjectiveWebChoristodera is an order of extinct semi-aquatic diapsid reptiles which ranged from the Middle Jurassic, or possibly Late Triassic, to at least the Early Miocene. Choristoderes have been found in North America, Asia, and Europe. The most common fossils are typically found from the Late... stray achievement scratchWebChoristoderes are a small clade of freshwater aquatic reptiles known from deposits of Jurassic–Miocene age. They show their greatest diversity in the Early Cretaceous of Asia, with seven recorded genera including longirostrine and brevirostine taxa, long- and short-necked taxa, and representatives of both neochoristoderes and non-neochoristoderes. roushan raj