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Emiliasaura
''Emiliasaura'' (meaning "Emilia's lizard") is an extinct genus of iguanodontian ornithopod dinosaurs from the Early Cretaceous (Valanginian) Mulichinco Formation of Neuquén Province, Argentina. The genus contains a single species, ''Emiliasaura alessandrii'', known from three individual specimens. ''Emiliasaura'' was initially described as a rhabdodontomorph. If this identification is correct, it would represent the oldest member of this clade and the first named from South America. However, a later analysis of rhabdodontomorphs failed to recover ''Emiliasaura'' within this clade, instead placing it as a styracosternan. Discovery and naming During the summer of 2009, Carlos Alessandri discovered productive outcrops of the Mulichinco Formation (Paraje Pilmatué locality) northeast of the city of Las Lajas in Neuquén Province, Argentina. The partial skeleton of a medium-sized ornithopod was collected in March of that year, comprising part of the left and , the left , an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mulichinco Formation
The Mulichinco Formation is a geological formation in Argentina. It is Valanginian in age and is predominantly terrestrial, being deposited at a time of marine regression in the Neuquén Basin, and predominantly consists of siliciclastic Siliciclastic (or ''siliclastic'') rocks are clastic noncarbonate sedimentary rocks that are composed primarily of silicate minerals, such as quartz or clay minerals. Siliciclastic rock types include mudrock, sandstone Sandstone is a Clastic ... rocks.Schwarz et al., 2005 Fossil content Dinosaurs Ornithopods Sauropods Theropods Echinoderms Plants References Bibliography * * * * {{issn, 0305-8719 Geologic formations of Argentina Lower Cretaceous Series of South America Cretaceous Argentina Valanginian Stage Mudstone formations of Argentina Siltstone formations of Argentina Sandstone formations Deltaic deposits Fluvial deposits Formations Fossiliferous stratigraphic units of South America Pal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2025 In Archosaur Paleontology
This article records new taxa of fossil Archosaur, archosaurs of every kind that are scheduled Binomial nomenclature, described during the year 2025, as well as other significant discoveries and events related to paleontology of archosaurs that are scheduled to occur in the year 2025. Pseudosuchians New pseudosuchian taxa General pseudosuchian research * Fitch, Kammerer & Sterling Nesbitt, Nesbitt (2025) describe Femur, femora of Poposauroidea, poposauroids similar to ''Poposaurus, Poposaurus gracilis'' from the Cumnock Formation, Cumnock and Pekin Formation, Pekin formations (Chatham Group; North Carolina, United States), expanding known geographical range of Late Triassic poposauroids. * McDavid (2025) discusses the validity and authorship of the name ''Prestosuchus'', considering the name ''Huenesuchus'' a junior synonym. Aetosaur research * A study on the histology of osteoderms of ''Stagonolepis, Stagonolepis olenkae'' is published by Błaszczeć & Antczak (2025). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhabdodontomorph
Rhabdodontomorpha is a clade of basal iguanodont dinosaurs. This group was named in 2016 in the context of the description, based on Spanish findings of an early member of the Rhabdodontidae. A cladistic analysis was conducted in which it was found that ''Muttaburrasaurus'' was the sister species of the Rhabdodontidae ''sensu'' Weishampel. Therefore, Paul-Emile Dieudonné, Thierry Tortosa, Fidel Torcida Fernández-Baldor, José Ignacio Canudo and Ignacio Díaz-Martínez defined Rhabdodontomorpha as a nodal clade: the group consisting of the last common ancestor of ''Rhabdodon priscus'' Matheron, 1869 and ''Muttaburrasaurus langdoni'' Bartholomai and Molnar, 1981; and all its descendants. Within the clade ''Zalmoxes'' and '' Mochlodon'' are also included. In 2021, Daniel Madzia redefined Rhabdodontomorpha in the ''PhyloCode'' as "the largest clade containing ''Rhabdodon priscus'', but not ''Iguanodon bernissartensis'' and ''Hypsilophodon foxii''". The clade is characterized by the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dryomorpha
Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (). They represent one of the most successful groups of herbivorous dinosaurs during the Cretaceous. The most primitive members of the group were bipedal and relatively small-sized, while advanced members of the subgroup Iguanodontia became quadrupedal and developed large body size. Their major evolutionary advantage was the progressive development of a chewing apparatus that became the most sophisticated ever developed by a non-avian dinosaur, rivaling that of modern mammals such as the domestic cow. They reached their apex of diversity and ecological dominance in the hadrosaurids (colloquially known as 'duck-bills'), before they were wiped out by the Cretaceous–Paleogene extinction event along with all other non- avian dinosaurs. Members are known worldwide. History of research In 1870, Thomas Henry Huxley listed Iguanodontidae (coined by Edward Drinker Cope a year earlier) as one of his three families ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhabdodontomorpha
Rhabdodontomorpha is a clade of basal iguanodont dinosaurs. This group was named in 2016 in the context of the description, based on Spanish findings of an early member of the Rhabdodontidae. A cladistic analysis was conducted in which it was found that ''Muttaburrasaurus'' was the sister species of the Rhabdodontidae ''sensu'' Weishampel. Therefore, Paul-Emile Dieudonné, Thierry Tortosa, Fidel Torcida Fernández-Baldor, José Ignacio Canudo and Ignacio Díaz-Martínez defined Rhabdodontomorpha as a nodal clade: the group consisting of the last common ancestor of '' Rhabdodon priscus'' Matheron, 1869 and ''Muttaburrasaurus langdoni'' Bartholomai and Molnar, 1981; and all its descendants. Within the clade '' Zalmoxes'' and '' Mochlodon'' are also included. In 2021, Daniel Madzia redefined Rhabdodontomorpha in the ''PhyloCode'' as "the largest clade containing '' Rhabdodon priscus'', but not ''Iguanodon bernissartensis'' and ''Hypsilophodon foxii''". The clade is characterized by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Styracosterna
Ankylopollexia is an extinct clade of ornithischian dinosaurs that lived from the Late Jurassic to the Late Cretaceous. It is a derived clade of iguanodontian ornithopods and contains the subgroup Styracosterna. The name stems from the Greek word, “ankylos”, mistakenly taken to mean stiff, fused (in fact the adjective means bent or curved; used of fingers, it can mean hooked), and the Latin word, “pollex”, meaning thumb. Originally described in 1986 by Sereno, a most likely synapomorphic feature of a conical thumb spine defines the clade.Sereno, P.C. (1986). "Phylogeny of the bird-hipped dinosaurs (order Ornithischia)". National Geographic Research 2 (2): 234–56 First appearing around 156 million years ago, in the Jurassic, Ankylopollexia became an extremely successful and widespread clade during the Cretaceous, and were found around the world. The group died out at the end of the Maastrichtian. They grew to be quite large, comparable to some carnivorous dinosaurs and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladogram
A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not show how ancestors are related to descendants, nor does it show how much they have changed, so many differing evolutionary trees can be consistent with the same cladogram. A cladogram uses lines that branch off in different directions ending at a clade, a group of organisms with a last common ancestor. There are many shapes of cladograms but they all have lines that branch off from other lines. The lines can be traced back to where they branch off. These branching off points represent a hypothetical ancestor (not an actual entity) which can be inferred to exhibit the traits shared among the terminal taxa above it. This hypothetical ancestor might then provide clues about the order of evolution of various features, adaptation, and other e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylogenetic
In biology, phylogenetics () is the study of the evolutionary history of life using observable characteristics of organisms (or genes), which is known as phylogenetic inference. It infers the relationship among organisms based on empirical data and observed heritable traits of DNA sequences, protein amino acid sequences, and morphology. The results are a phylogenetic tree—a diagram depicting the hypothetical relationships among the organisms, reflecting their inferred evolutionary history. The tips of a phylogenetic tree represent the observed entities, which can be living taxa or fossils. A phylogenetic diagram can be rooted or unrooted. A rooted tree diagram indicates the hypothetical common ancestor of the taxa represented on the tree. An unrooted tree diagram (a network) makes no assumption about directionality of character state transformation, and does not show the origin or "root" of the taxa in question. In addition to their use for inferring phylogenetic pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palaeontologia Electronica
''Palaeontologia Electronica'' is a triannual peer-reviewed open-access scientific journal published by Coquina Press covering paleontology. It was established in 1998 and is the oldest fully open-access electronic journal of paleontology. The journal is sponsored by the Society of Vertebrate Paleontology, the Paleontological Society, the Palaeontological Association, and thWestern Interior Paleontological Society The editors-in-chief are Julien Louys (Griffith University) and Andrew Bush (University of Connecticut). In 2000, the first taxonomic names published electronically under new rules in the International Code of Zoological Nomenclature were published in the journal by Scott et al. for three new species of fossil foraminifera: '' Eggerella matsunoi'', '' Haplophragmoides hatai'', and '' Haplophragmoides nishikizawensis''. Abstracting and indexing The journal is abstracted and indexed in: *Biological Abstracts *BIOSIS Previews *Current Contents/Physical, Chemical & Earth Scie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Cretaceous
The Early Cretaceous (geochronology, geochronological name) or the Lower Cretaceous (chronostratigraphy, chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 143.1 Megaannum#SI prefix multipliers, Ma to 100.5 Ma. Geology Proposals for the exact age of the Barremian–Aptian boundary ranged from 126 to 117 Ma until recently (as of 2019), but based on drillholes in Svalbard the defining Anoxic event#Cretaceous, early Aptian Oceanic Anoxic Event 1a (OAE1a) was dated to 123.1±0.3 Ma, limiting the possible range for the boundary to c. 122–121 Ma. There is a possible link between this anoxic event and a series of Early Cretaceous large igneous provinces (LIP). The Ontong Java Plateau, Ontong Java-Manihiki Plateau, Manihiki-Hikurangi Plateau, Hikurangi large igneous province, emplaced in the South Pacific at c. 120 Ma, is by far the largest LIP in Earth's history. The Onto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
