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Lagerpetid
Lagerpetidae (; originally Lagerpetonidae) is a family of basal avemetatarsalians. Though traditionally considered the earliest-diverging dinosauromorphs (reptiles closer to dinosaurs than to pterosaurs), fossils described in 2020 suggest that lagerpetids may instead be pterosauromorphs (closer to pterosaurs). Lagerpetid fossils are known from the Late Triassic of Argentina, Arizona, Brazil, Madagascar, New Mexico, and Texas. They were typically small, although some lagerpetids, like ''Dromomeron gigas'' and a specimen from the Santa Rosa Formation attributed to ''Dromomeron'' sp., were able to get quite large (femoral length ). Lagerpetid fossils are rare; the most common finds are bones of the hindlimbs, which possessed a number of unique features. Description As with most early avemetatarsalians, the most characteristic adaptations of lagerpetids occurred in their hip, leg and ankle bones, likely as a result of these being the bones most commonly preserved. Hip material is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kongonaphon
''Kongonaphon'' is an extinct genus of lagerpetid avemetatarsalians from the Middle to Late Triassic of Madagascar. It contains a single species, ''Kongonaphon kely'', which is known from a fragmentary partial skeleton. This fossil hails from the late Ladinian or early Carnian-age "basal Isalo II beds". As the first lagerpetid found in Africa, ''Kongonaphon'' extends the range of the family significantly. It possessed a combination of features from various other lagerpetids, but developed particularly long and slender leg bones. ''Kongonaphon'' is also the first lagerpetid for which fossils of the snout and teeth are known. It was likely an insectivore based on the shape and texture of its teeth. ''Kongonaphon'' is notable for its minuscule size, even compared to other small early avemetatarsalians. The proportionally elongated femur was only about 4 cm (1.6 inches) long, and the total height of the animal was estimated at around 10 cm (3.9 inches). Alongside other min ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinosauromorpha
Dinosauromorpha is a clade of avemetatarsalian archosaurs (reptiles closer to birds than to crocodilians) that includes the Dinosauria (dinosaurs) and some of their close relatives. It was originally defined to include dinosauriforms and lagerpetids, with later formulations specifically excluding pterosaurs from the group. Birds are the only dinosauromorphs which survive to the present day. Classification The name "Dinosauromorpha" was briefly coined by Michael J. Benton in 1985. It was considered an alternative name for the group "Ornithosuchia", which was named by Jacques Gauthier to correspond to archosaurs closer to dinosaurs than to crocodilians. Although "Ornithosuchia" was later recognized as a misnomer (since ornithosuchids are now considered closer to crocodilians than to dinosaurs), it was still a more popular term than Dinosauromorpha in the 1980s. The group encompassed by Gauthier's "Ornithosuchia" and Benton's "Dinosauromorpha" is now given the name Avemetatars ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pterosauromorphs
Pterosauromorpha (meaning "pterosaur-like forms") is one of the two basic divisions of Ornithodira that includes pterosaurs and all taxa that are closer to them than to dinosaurs and their close relatives (i.e. Dinosauromorpha). In addition to pterosaurs, Pterosauromorpha also includes the basal clade Lagerpetidae and some other Late Triassic ornithodirans ('' Maehary'' and '' Scleromochlus''). Classification The name Pterosauromorpha was originally coined by Emil Kuhn-Schnyder and Hans Rieber (1986) for a reptilian subclass distinct from Archosauria which includes pterosaurs. In 1997, Kevin Padian classified Pterosauromorpha as a clade of archosaurs and proposed phylogenetic definition for this group: "Pterosauria and all ornithodiran archosaurs closer to them than to dinosaurs". Brian Andres and Kevin Padian redefined Pterosauromorpha as: "The clade consisting of ''Pterodactylus'' (originally ''Ornithocephalus'') ''antiquus'' (Sömmerring 1812) (Pterosauria) and all organ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ixalerpeton Skeletal
''Ixalerpeton'' (meaning "leaping reptile") is a genus of lagerpetid avemetatarsalian containing one species, ''I. polesinensis''. It lived in the Late Triassic of Brazil alongside the sauropodomorph dinosaur ''Buriolestes''. Discovery and naming The holotype specimen of ''Ixalerpeton'', numbered ULBRA-PVT059, consists of parts from the skull, vertebral column, and all four limbs. The specimen comes from the Carnian Santa Maria Formation of Brazil, and it was found alongside two individuals of ''Buriolestes'' as well as a set of femora belonging to second individual of ''Ixalerpeton''. The genus name of ''Ixalerpeton'' combines the Greek words ''ixalos'' ("leaping") and ''erpeton'' ("reptile"), and the species name ''polesinensis'' references the town of São João do Polêsine, where the dig site is located. Description ''Ixalerpeton'' was similar to other lagerpetids (namely ''Dromomeron'' and ''Lagerpeton'') in having long hindlimbs with well-developed muscle attachment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ixalerpeton
''Ixalerpeton'' (meaning "leaping reptile") is a genus of lagerpetid avemetatarsalian containing one species, ''I. polesinensis''. It lived in the Late Triassic of Brazil alongside the sauropodomorph dinosaur ''Buriolestes''. Discovery and naming The holotype specimen of ''Ixalerpeton'', numbered ULBRA-PVT059, consists of parts from the skull, vertebral column, and all four limbs. The specimen comes from the Carnian Santa Maria Formation of Brazil, and it was found alongside two individuals of ''Buriolestes'' as well as a set of femora belonging to second individual of ''Ixalerpeton''. The genus name of ''Ixalerpeton'' combines the Greek words ''ixalos'' ("leaping") and ''erpeton'' ("reptile"), and the species name ''polesinensis'' references the town of São João do Polêsine, where the dig site is located. Description ''Ixalerpeton'' was similar to other lagerpetids (namely ''Dromomeron'' and ''Lagerpeton'') in having long hindlimbs with well-developed muscle attachments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lagerpeton
''Lagerpeton'' is a genus of lagerpetid avemetatarsalian, comprising a single species, ''L. chanarensis''. First described from the Chañares Formation of Argentina by A. S. Romer in 1971, ''Lagerpeton'' anatomy is somewhat incompletely known, with fossil specimens accounting for the pelvic girdle, hindlimbs, posterior presacral, sacral and anterior caudal vertebrae. Skull and shoulder material has also been described. The name comes from the Greek (, "hare") plus (, "reptile"). Discovery ''Lagerpeton'' fossils have only been collected from the Chañares Formation in La Rioja Province, Argentina. The first of these fossils were discovered in a 1964-1965 expedition by the Museum of Comparative Zoology (MCZ) and Museo de la Plata (MLP), although some were also discovered in 1966 by paleontologists from the Miguel Lillo Institute (PVL) of the University of Tucuman. Alfred Romer named ''Lagerpeton chanarensis'' in 1971, based on a complete right hindlimb discovered dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avemetatarsalia
Avemetatarsalia (meaning "bird metatarsals") is a clade of diapsid reptiles containing all archosaurs more closely related to birds than to crocodilians. The two most successful groups of avemetatarsalians were the dinosaurs and pterosaurs. Dinosaurs were the largest terrestrial animals for much of the Mesozoic Era, and one group of small feathered dinosaurs (Aves, i.e. birds) has survived up to the present day. Pterosaurs were the first flying vertebrates and persisted through the Mesozoic before dying out at the Cretaceous-Paleogene (K-Pg) extinction event. Both dinosaurs and pterosaurs appeared in the Triassic Period, shortly after avemetatarsalians as a whole. The name Avemetatarsalia was first established by British palaeontologist Michael Benton in 1999. An alternate name is Panaves, or "all birds", in reference to its definition containing all animals, living or extinct, which are more closely related to birds than to crocodilians. Although dinosaurs and pterosaurs were th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dromomeron Gregorii
''Dromomeron'' (meaning "running femur") is a genus of lagerpetid avemetatarsalian which lived around 220 to 211.9 ± 0.7 million years ago. The genus contains species known from Late Triassic-age rocks of the Southwestern United States and northwestern Argentina. It is described as most closely related to the earlier ''Lagerpeton'' of Argentina, but was found among remains of true dinosaurs like ''Chindesaurus'', indicating that the first dinosaurs did not immediately replace related groups. Based on the study of the overlapping material of ''Dromomeron'' and ''Tawa hallae'', Christopher Bennett proposed that the two taxa were conspecific, forming a single growth series of ''Dromomeron''. However, noting prominent differences between their femurs which cannot be attributed to variation with age, Rodrigo Muller rejected this proposal in 2017. He further noted that, while ''D. romeri'' is known from juveniles only, it shares many traits in common with ''D. gigas'', which is known f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dromomeron
''Dromomeron'' (meaning "running femur") is a genus of lagerpetid avemetatarsalian which lived around 220 to 211.9 ± 0.7 million years ago. The genus contains species known from Late Triassic-age rocks of the Southwestern United States and northwestern Argentina. It is described as most closely related to the earlier '' Lagerpeton'' of Argentina, but was found among remains of true dinosaurs like '' Chindesaurus'', indicating that the first dinosaurs did not immediately replace related groups. Based on the study of the overlapping material of ''Dromomeron'' and '' Tawa hallae'', Christopher Bennett proposed that the two taxa were conspecific, forming a single growth series of ''Dromomeron''. However, noting prominent differences between their femurs which cannot be attributed to variation with age, Rodrigo Muller rejected this proposal in 2017. He further noted that, while ''D. romeri'' is known from juveniles only, it shares many traits in common with ''D. gigas'', which is kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scleromochlus
''Scleromochlus'' (from el, σκληρός , 'hard' and el, μοχλός , 'lever') is an extinct genus of small pterosauromorph archosaurs from the Late Triassic period. The genus contains the type and only species ''Scleromochlus taylori'', named by Arthur Smith Woodward in 1907. Discovery Its fossils have been found in the Carnian Lossiemouth Sandstone of Scotland. The holotype was discovered around 1900 and is listed as specimen BMNH R3556, a partial skeleton preserved as an impression in sandstone, with portions of the skull and tail missing. Description ''Scleromochlus taylori'' was about long, with long hind legs; it may have been capable of four-legged and two-legged locomotion. Studies about its gait suggest that it engaged in kangaroo- or springhare-like plantigrade hopping; however, a 2020 reassessment of ''Scleromochlus'' by Bennett suggested that it was a "sprawling quadrupedal hopper analogous to frogs." If ''Scleromochlus'' is indeed related to pterosaurs, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dromomeron Gigas
''Dromomeron'' (meaning "running femur") is a genus of lagerpetid avemetatarsalian which lived around 220 to 211.9 ± 0.7 million years ago. The genus contains species known from Late Triassic-age rocks of the Southwestern United States and northwestern Argentina. It is described as most closely related to the earlier ''Lagerpeton'' of Argentina, but was found among remains of true dinosaurs like ''Chindesaurus'', indicating that the first dinosaurs did not immediately replace related groups. Based on the study of the overlapping material of ''Dromomeron'' and ''Tawa hallae'', Christopher Bennett proposed that the two taxa were conspecific, forming a single growth series of ''Dromomeron''. However, noting prominent differences between their femurs which cannot be attributed to variation with age, Rodrigo Muller rejected this proposal in 2017. He further noted that, while ''D. romeri'' is known from juveniles only, it shares many traits in common with ''D. gigas'', which is known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santa Rosa Formation, New Mexico
The Santa Rosa Formation is a geologic formation exposed in New Mexico that was deposited in the Carnian Age of the late Triassic Period. Description The formation consists mostly of white to brown sandstone and mudstone with some interbedded conglomerate. The formation lies on the Anton Chico Formation and is overlain by the Garita Creek Formation. The total thickness of the formation is . The formation is divided into (in ascending stratigraphic order) the ''Tecolotito Member'', which is primarily sandstone; the ''Los Esteros Member'', which is primarily mudstone; and the ''Tres Lagunas Member'', which is primarily sandstone. The sandstone members are interpreted as alluvial sheets deposited by braided streams. The Los Esteros Member is interpreted as a lacustrine deposit in lakes that formed due to local subsidence from dissolution of underlying Permian salt beds. Paleocurrents were primarily to the south in the Tecolotito Member and northeast in the Tres Lagunas Member bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
