Dinosauromorpha

Dinosauromorphs
Temporal range: Early Triassic – Present, 249–0 Ma (possible Early Triassic record)
From top to bottom and left to right, different type of dinosauromorphs: Asilisaurus, Borealopelta, Triceratops and Giganotosaurus.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Ornithodira
Clade: Dinosauromorpha
Benton, 1985[1]
Subgroups

Dinosauromorpha is a clade of avemetatarsalians (archosaurs 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,[3] with later formulations specifically excluding pterosaurs from the group.[4] Birds are the only dinosauromorphs which survive to the present day.

Classification

Pelvis of Marasuchus (=Lagosuchus?) specimen PVL 3870

The name "Dinosauromorpha" was briefly coined by Michael J. Benton in 1985.[1] 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.[5] 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.[3] The group encompassed by Gauthier's "Ornithosuchia" and Benton's "Dinosauromorpha" is now given the name Avemetatarsalia.[4]

In 1991, Paul Sereno redefined Dinosauromorpha as a node-based clade, defined by a last common ancestor and its descendants. In his definition, Dinosauromorpha included the last common ancestor of Lagerpeton (a lagerpetid), Marasuchus (a possible junior synonym of Lagosuchus), Pseudolagosuchus (now considered a synonym of the silesaurid Lewisuchus), Dinosauria (including Aves), and all its descendants. This definition was intended to correspond to a clade including lagerpetids and crownward bird-line archosaurs, but not pterosaurs or other archosaurs.[3][6]

In 2011, Dinosauromorpha was redefined by Sterling Nesbitt to be a branch-based clade, defined by including reptiles closer to one group than to another. Under this definition, Dinosauromorpha included all reptiles closer to dinosaurs (represented by Passer domesticus, the house sparrow), rather than pterosaurs (represented by Pterodactylus), ornithosuchids (represented by Ornithosuchus), or other pseudosuchians (represented by Crocodylus niloticus, the Nile crocodile). Nesbitt's study supported the hypothesis that Pterosauromorpha (pterosaurs and their potential relatives) was the sister group of Dinosauromorpha. Pterosauromorphs and dinosauromorphs together formed the group Ornithodira, which encompasses almost all avemetatarsalians.[4]

Dinosauriformes was coined in 1992 by F.E. Novas, who used it to encompass dinosaurs, Lagosuchus, "Pseudolagosuchus" (=Lewisuchus), and the herrerasaurids, which he did not consider to be "eudinosaurs" (true dinosaurs like ornithischians and saurischians).[7] Contrary to Novas, most paleontologists since 1992 have considered herrerasaurids to be true dinosaurs, though many other dinosaur-like reptiles still fall within his definition of Dinosauriformes. Novas (1992) defined Dinosauriformes as a node-based clade containing the most recent common ancestor of Lagosuchus and Dinosauria, and all its descendants.[7] Nesbitt (2011) provided a roughly equivalent definition, using Marasuchus and Passer domesticus (the house sparrow, a representative of dinosaurs). In his analysis, Dinosauriformes included dinosaurs, silesaurids, and Marasuchus, but not lagerpetids, which were considered to be an earlier-branching family of dinosauromorphs.[4]

Phylogeny

A phylogenetic analysis by Andrea Cau in 2018 resolved two different topologies for dinosaur origins, depending on whether it was run using parsimony or bayesian inference. Cau coined the term Dracohors for the clade uniting all taxa closer to the theropod Megalosaurus bucklandi than the basal form Marasuchus lilloensis. The name is derived from the Latin words for "dragon" and "cohort", draco and cohors. Under parsimony results, Dracohors included only Silesauridae and Dinosauria, the latter including the groups Herrerasauria, Sauropodomorpha, Theropoda and Ornithischia, along with the basal form Eodromaeus. However, under bayesian results, Herrerasauria placed outside Dinosauria within Dracohors, and Dinosauriformes, Dinosauromorpha, and Pan-Aves were synonyms, with Marasuchus in a clade with lagerpetids. Pisanosaurus was resolved within Silesauridae. Cau identified the synapomorphies of Dracohors as:[8]

The anterior tympanic recess, the axial epipophyses, the centrodiapophyseal laminae in the presacral vertebrae, the relative size enlargement of the postacetabular process of ilium, the elongation of the pubis, the proximal sulcus and the reduction of the ligament tuber in the femoral head, and the further reduction in length of the fourth metatarsal and toe compared to the third.

Skeletal diagram of Ixalerpeton

Following the discovery and description of more cranial and postcranial material of the genera Kongonaphon, Ixalerpeton and Lagerpeton, it was found that lagerpetids shared many features with the basal taxa of Pterosauria. Features of the maxillary bone, teeth, braincase and forelimb meant that the 2020 phylogenetic analysis of Ezcurra and colleagues placed Lagerpetidae next to pterosaurs within Pterosauromorpha, removing the family from Dinosauromorpha. The contents of Dinosauromorpha was thus restricted to only Silesauridae, Dinosauria, and individual genera like Lagosuchus.[9]

Simultaneously, Rodrigo Müller and Maurício Garcia published novel results that reduced the family Silesauridae to a grade of basal dinosaurs in Ornithischia. Pisanosaurus, considered by various authors to be either a silesaurid or basal ornithischian, was found to be intermediate between the grade of silesaurids and true ornithischians, explaining its peculiar combination of silesaurid and ornithischian features that has resulted in its phylogenetic inconsistency. Lewisuchus, a carnivorous form, was found to be the most primitive form of ornithischian, which was almost universally considered to be an only-herbivorous clade before. Dinosauromorpha was reduced to only including Lagerpetidae and Lagosuchus as a result of the reclassification of silesaurids.[10]

Below are the results of:

A variety of individual species and taxa have at times been found to place within Dinosauromorpha and its subgroups, but outside Dinosauria. The taxon Marasuchus has been consistently recovered as a dinosauromorph between lagerpetids and silesaurids, but may also be a junior synonym of the coexisting form Lagosuchus, another dinosauromorph.[11] Pisanosaurus, traditionally considered an ornithischian, was recovered in an unpublished analysis as a dinosauriform outside other clades,[12] but has since been recovered only as a member of Silesauridae or Ornithischia.[10][13][14][15] Saltopus, an enigmatic taxon from the Late Triassic of Scotland, has been placed closer to dinosaurs than Marasuchus, in a polytomy with Silesauridae and Dinosauria,[13] as a sister taxon to Marasuchus,[14][15] or within Dinosauria as a basal saurischian.[10] The British taxon Agnosphitys was originally described as a dinosauriform closer to Dinosauria than Herrerasaurus,[16] but has also been classified as a dinosauriform more derived than silesaurids but basal to Herrerasauridae and Dinosauria,[15] a silesaurid,[13] or a basal saurischian.[10][14] The genus Nyasasaurus from the early Late Triassic of Tanzania is known from multiple incomplete specimens, making it difficult to classify. It has been found as the direct sister taxon of Dinosauria, the basalmost ornithischian, a basal theropod,[17] or a deeply-nested sauropodomorph.[13][14][15]

Origins

Dinosauromorphs appeared putatively around 242 to 244 million years ago by the Anisian stage of the Middle Triassic, splitting from other ornithodires. Early Triassic footprints reported in October 2010 from the Świętokrzyskie (Holy Cross) Mountains of Poland may belong to a dinosauromorph. If so, the origin of dinosauromorphs would be pushed back into the Early Olenekian, around 249 Ma. The oldest Polish footprints are from a small quadrupedal animal named Prorotodactylus, but footprints belonging to the ichnogenus Sphingopus that have been found from Early Anisian strata show that moderately large bipedal dinosauromorphs had appeared by 246 Ma. The tracks show that the dinosaur lineage appeared soon after the Permian-Triassic extinction event. Their age suggests that the rise of dinosaurs was slow and drawn out across much of the Triassic.[18] The oldest known dinosauromorph is Asilisaurus, a silesaurid which may have lived as early as the Anisian age of the middle Triassic period, about 245 million years ago,[19] although it is possible that Nyasasaurus is a dinosaur of the same age, pushing the origins of the groups back further.[13]

Putative basal dinosauromorphs include Saltopus,[20][21] Marasuchus, the perhaps identical Lagosuchus, the lagerpetid Lagerpeton from the Ladinian of Argentina and Dromomeron from the Norian of Arizona, New Mexico, and Texas (all in the United States), Ixalerpeton polesinensis and an unnamed form from the Carnian (Santa Maria Formation) of Brazil,[22][23] and the silesaurids, which include Silesaurus from the Carnian of Poland, Eucoelophysis from the Carnian-Norian of New Mexico, Lewisuchus and the perhaps identical Pseudolagosuchus from the Ladinian of Argentina,[24][25] Sacisaurus from the Norian of Brazil,[26] Technosaurus from the Carnian of Texas,[27] Asilisaurus from the Anisian of Tanzania,[28] and Diodorus from the Carnian(?) to Norian of Morocco.[29]

References

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  2. ^ Matthew G. Baron; Megan E. Williams (2018). "A re-evaluation of the enigmatic dinosauriform Caseosaurus crosbyensis from the Late Triassic of Texas, USA and its implications for early dinosaur evolution". Acta Palaeontologica Polonica. 63. doi:10.4202/app.00372.2017.
  3. ^ a b c Sereno, Paul C. (1991-12-31). "Basal Archosaurs: Phylogenetic Relationships and Functional Implications". Journal of Vertebrate Paleontology. 11 (sup004): 1–53. Bibcode:1991JVPal..11S...1S. doi:10.1080/02724634.1991.10011426. ISSN 0272-4634.
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Flag with three bands (bends or pales), not necessarily in three colours A triband is a vexillological style which consists of three stripes arranged to form a flag. These stripes may be two or three colours, and may be charged with an emblem in the middle stripe.[1] All tricolour flags are tribands, but not all tribands are tricolour flags, which requires three unique colours. Design Outside of the name, which requires three bands of colour, there are no other requirements for what a...

 

 

For You (Crystal Kay album)

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: For You Crystal Kay album – news · newspapers · books · scholar · JSTOR (August 2024) (Learn how and when to remove this message) 2018 studio album by Crystal KayFor YouStudio album by Crystal KayReleasedJune 13, 2018 (2018-06-13)Re...

 

 

Hastings Ismay

Hastings Ismay Ismay en 1945 1.er Secretario general de la OTAN 1952-1957Sucesor Paul-Henri Spaak Secretario de Estado para las Relaciones con la Mancomunidad 28 de octubre de 1951-12 de marzo de 1952Primer ministro Winston ChurchillPredecesor Patrick Gordon WalkerSucesor Robert Gascoyne-Cecil Información personalNombre de nacimiento Hastings Lionel Ismay Nombre en inglés Hastings Ismay, 1. Baron Ismay Apodo Pug Nacimiento 21 de junio de 1887Nainital, Provincias del Noroeste, IndiaFallecimi...

Indian philosophy

Indian philosophical traditionsYajnavalkya (c. 8th century BCE), an important Vedic sage associated with the thought of the early Upanishads.[1]Jain philosophy was propagated by Tirthankaras, notably Parshvanatha (c. 872 – c. 772 BCE) and Mahavira (c. 549–477 BCE).Buddhist philosophy was founded by Gautama Buddha (c. 563–483 BCE).Sikh philosophy was developed by Guru Gobind Singh (c. 1666–1708 CE). Part of a series onEastern philosophy ChinaHundred Schools of Thought Confucia...

 

 

Pembroke College, Cambridge

Constituent college of the University of Cambridge Pembroke CollegeUniversity of CambridgeOld Court, Pembroke CollegeArms of Pembroke College, Cambridge: Arms of Valence (Barry (of ten) argent and azure, an orle of French martlets gules) dimidiating St Pol (Châtillon): (Gules, three pales vair a chief or with a label of three points azure for difference)Scarf colours: dark blue, with two equally-spaced narrow Cambridge blue stripes LocationTrumpington Street (map)Coordinates52°12′07″N 0...