Albertadromeus (lat.) , Also known as albertadromeus , or albertadromeus is a genus of herbivorous poultry- tailed ornithopod dinosaurs from the Upper Cretaceous of North America. The type and only species Albertadromeus syntarsus was named and described by Brown and others in 2013. The generic name means “runner from Alberta”, referring to the location of the remains - Alberta , Canada , and the alleged running dinosaur lifestyle. The species name is derived from the two Greek words “συν” - “together” and “ταρσός” - “tarsus” and describes the autapomorphic state of the distal part of the fibula, which has reduced and merged with the distal part of the tibia [1] .
| † Albertadromeus |
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| No rank : | Bilateral symmetrical |
| Infraclass : | Archosauromorphs |
| No rank : | Archosauriformes |
| Infrastructure : | † Ornithopods |
| Family: | † Thescelosauridae |
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| International scientific name |
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Albertadromeus Brown et al. , 2013 |
| Single view |
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- † Albertadromeus syntarsus
Brown et al. , 2013
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Content
Holotype TMP 2009.037.0044 was discovered in the Oldman formation layer dated to the Middle Campanian , about 77-76 Ma, Alberta, Canada. It includes a partial postcranial skeleton consisting of separate cervical ribs, two articulated dorsal vertebrae and a separate caudal, ossified tendon, left tibia and fibula, a fragment of the right fibula, and fragments of the metatarsal and claw bones [1] .
Albertadromey was a small bipedal herbivorous dinosaur about 1.5 m long. The animal is diagnosed by the following signs: the distal fibula is reduced to a thin bone plate, which merges with the front surface of the tibia by 1/3 of its length (common with heterodontosaurids ), the lateral condyle of the proximal tibial strongly bifurcated (shared with Changchunsaurus , Eocursor , Hypsilophodon , Jeholosaurus , Lesothosaurus , Orodromeus , Oryctodromeus , Stormbergia ), cnemial ridge protrudes dorsally, whereby the rear end tilted olshebertsovoy bone dorsally (holds convergence at gasparinizavry and Micropachycephalosaurus ) [1] .
According to the results of the cladistic analysis of Brown et al., In 2013, using 137 characters for 30 taxa, the albertadromes fall into the subfamily Orodromin , the family of Tescelosaurus , together with the Orodrome, Marshmallow and Orictodrome. At the same time, it acts as a sister taxon of the orodrome clades + zephyrosaurus, which leads to an unsolvable polytomy of these three taxa [1] .
Cladogram based on analysis of Brown et al. In 2013:
| Genasauria |
| Heterodontosaurus |
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| Scutellosaurus |
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| Lesothosaurus |
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| Agilisaurus |
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| Hexinlusaurus |
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| Thnielosaurus |
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| | Thescelosauridae | | Oredrominae |
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| TMP 2008.045.0002 |
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| Ryctodromeus |
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| Albertadromeus |
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| Oredromeus |
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| Zephyrosaurus |
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| | Thescelosaurinae |
| Parksosaurus |
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| Changchunsaurus |
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| Haya |
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| Jeholosaurus |
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| Thescelosaurus assiniboiensis |
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| Thescelosaurus neglectus |
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| Hypsilophodon |
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| Gasparinisaura |
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| Tenontosaurus |
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| To Euornithopoda |
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- ↑ 1 2 3 4 Brown, CM; Evans, DC; Ryan, MJ; Russell, AP (2013). "New data on the diversity and abundance of small-bodied ornithopods (Dinosauria, Ornithischia) from the Belly River Group (Campanian) of Alberta." Journal of Vertebrate Paleontology 33 (3): 495