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- Protoavis abstract "Protoavis (meaning \"first bird\") is a problematic taxon of archosaurian known from fragmentary remains from Late Triassic Norian stage deposits near Post, Texas. Much controversy remains over the animal, and there are many different interpretations of what Protoavis actually is. When it was first described, the fossils were described as being from a primitive bird which, if the identification is valid, would push back avian origins some 60-75 million years. The original describer of Protoavis texensis, Sankar Chatterjee of Texas Tech University, interpreted the type specimen to have come from a single animal, specifically a 35 cm tall bird that lived in what is now Texas, USA, around 210 million years ago. Though it existed far earlier than Archaeopteryx, its skeletal structure is allegedly more bird-like. Protoavis has been reconstructed as a carnivorous bird that had teeth on the tip of its jaws and eyes located at the front of the skull, suggesting a nocturnal or crepuscular lifestyle. Reconstructions usually depict it with feathers, as Chatterjee originally interpreted structures on the arm to be quill knobs, the attachment point for flight feathers found in some modern birds and non-avian dinosaurs. However, re-evaluation of the fossil material by subsequent authors such as Lawrence Witmer have been inconclusive regarding whether or not these structures are actual quill knobs.However, this description of Protoavis assumes that Protoavis has been correctly interpreted as a bird. Almost all palaeontologists doubt that Protoavis is a bird, or that all remains assigned to it even come from a single species, because of the circumstances of its discovery and unconvincing avian synapomorphies in its fragmentary material. When they were found at the Tecovas and Bull Canyon Formations in the Texas panhandle in 1984, in a sedimentary strata of a Triassic river delta, the fossils were a jumbled cache of disarticulated bones that may reflect an incident of mass mortality following a flash flood.".
- Protoavis wikiPageExternalLink index.php?title=Protoavis.
- Protoavis wikiPageID "672740".
- Protoavis wikiPageLength "48205".
- Protoavis wikiPageOutDegree "262".
- Protoavis wikiPageRevisionID "675016949".
- Protoavis wikiPageWikiLink 1991_in_paleontology.
- Protoavis wikiPageWikiLink Aetosaur.
- Protoavis wikiPageWikiLink Alan_Feduccia.
- Protoavis wikiPageWikiLink Americas.
- Protoavis wikiPageWikiLink Antitrochanter.
- Protoavis wikiPageWikiLink Antorbital_fenestra.
- Protoavis wikiPageWikiLink Archaeopteryx.
- Protoavis wikiPageWikiLink Archosaur.
- Protoavis wikiPageWikiLink Astragalus.
- Protoavis wikiPageWikiLink Avicephala.
- Protoavis wikiPageWikiLink Basal_(phylogenetics).
- Protoavis wikiPageWikiLink Biogeography.
- Protoavis wikiPageWikiLink Bipedalism.
- Protoavis wikiPageWikiLink Bird.
- Protoavis wikiPageWikiLink Calcaneus.
- Protoavis wikiPageWikiLink Carinate.
- Protoavis wikiPageWikiLink Carnian.
- Protoavis wikiPageWikiLink Carnivore.
- Protoavis wikiPageWikiLink Carpal_bones.
- Protoavis wikiPageWikiLink Category:Basal_Ornithurae.
- Protoavis wikiPageWikiLink Category:Fossil_taxa_described_in_1991.
- Protoavis wikiPageWikiLink Category:Late_Triassic_reptiles_of_North_America.
- Protoavis wikiPageWikiLink Category:Nomina_dubia.
- Protoavis wikiPageWikiLink Category:Paleontological_chimeras.
- Protoavis wikiPageWikiLink Category:Triassic_archosaurs.
- Protoavis wikiPageWikiLink Category:Triassic_dinosaurs.
- Protoavis wikiPageWikiLink Ceratosauria.
- Protoavis wikiPageWikiLink Cervical_vertebrae.
- Protoavis wikiPageWikiLink Chilesaurus.
- Protoavis wikiPageWikiLink Chimera_(paleontology).
- Protoavis wikiPageWikiLink Clade.
- Protoavis wikiPageWikiLink Cladistics.
- Protoavis wikiPageWikiLink Coelophysis.
- Protoavis wikiPageWikiLink Coelurosauria.
- Protoavis wikiPageWikiLink Cooper_Canyon_Formation.
- Protoavis wikiPageWikiLink Coracoid.
- Protoavis wikiPageWikiLink Cranial_kinesis.
- Protoavis wikiPageWikiLink Cretaceous.
- Protoavis wikiPageWikiLink Crista_tibiofibularis_groove.
- Protoavis wikiPageWikiLink D._Stefan_Peters.
- Protoavis wikiPageWikiLink Deltopectoral_crest.
- Protoavis wikiPageWikiLink Diapsid.
- Protoavis wikiPageWikiLink Dinosaur.
- Protoavis wikiPageWikiLink Dockum_Group.
- Protoavis wikiPageWikiLink Drepanosaur.
- Protoavis wikiPageWikiLink Early_Triassic.
- Protoavis wikiPageWikiLink Edward_Drinker_Cope.
- Protoavis wikiPageWikiLink Endocast.
- Protoavis wikiPageWikiLink Epiotic.
- Protoavis wikiPageWikiLink Eurasia.
- Protoavis wikiPageWikiLink Evgeny_Kurochkin.
- Protoavis wikiPageWikiLink Feather.
- Protoavis wikiPageWikiLink Feathered_dinosaur.
- Protoavis wikiPageWikiLink Femur.
- Protoavis wikiPageWikiLink Fibula.
- Protoavis wikiPageWikiLink Flash_flood.
- Protoavis wikiPageWikiLink Flight_feather.
- Protoavis wikiPageWikiLink Furcula.
- Protoavis wikiPageWikiLink George_Olshevsky.
- Protoavis wikiPageWikiLink Glenoid_cavity.
- Protoavis wikiPageWikiLink Gregory_S._Paul.
- Protoavis wikiPageWikiLink Herrerasauridae.
- Protoavis wikiPageWikiLink Herrerasaurus.
- Protoavis wikiPageWikiLink Heterocoelus.
- Protoavis wikiPageWikiLink Holotype.
- Protoavis wikiPageWikiLink Homology_(biology).
- Protoavis wikiPageWikiLink Humerus.
- Protoavis wikiPageWikiLink Hypapophyses.
- Protoavis wikiPageWikiLink Hypocleidium.
- Protoavis wikiPageWikiLink Ilium_(bone).
- Protoavis wikiPageWikiLink Invertebrate.
- Protoavis wikiPageWikiLink Ischium.
- Protoavis wikiPageWikiLink Jacques_Gauthier.
- Protoavis wikiPageWikiLink Jugal_bone.
- Protoavis wikiPageWikiLink Jurassic.
- Protoavis wikiPageWikiLink Kirkpatrick_Quarry.
- Protoavis wikiPageWikiLink Late_Triassic.
- Protoavis wikiPageWikiLink Law_of_included_fragments.
- Protoavis wikiPageWikiLink Lawrence_Witmer.
- Protoavis wikiPageWikiLink Luis_M._Chiappe.
- Protoavis wikiPageWikiLink Maniraptora.
- Protoavis wikiPageWikiLink Manus_(anatomy).
- Protoavis wikiPageWikiLink Megalancosaurus.
- Protoavis wikiPageWikiLink Mesozoic.
- Protoavis wikiPageWikiLink Mortality_plate.
- Protoavis wikiPageWikiLink Muscle_protractor_pterygoidei_et_quadrati.
- Protoavis wikiPageWikiLink Nomen_dubium.
- Protoavis wikiPageWikiLink Norian.
- Protoavis wikiPageWikiLink Occams_razor.
- Protoavis wikiPageWikiLink Ontogeny.
- Protoavis wikiPageWikiLink Opisthostylic.
- Protoavis wikiPageWikiLink Origin_of_avian_flight.
- Protoavis wikiPageWikiLink Origin_of_birds.
- Protoavis wikiPageWikiLink Ornithischia.