| 词条 | Oradectes |
| 释义 |
| name = Oradectes | taxon = Oradectes | fossil_range = Early Permian | authority = Kissel, 2010 | subdivision_ranks = Species | subdivision =
}} Oradectes (meaning "margin biter", from Latin ora (margin) and dectes (biter)) is an extinct genus of diadectid reptiliomorph. It is known from a single partial skeleton collected from the Early Permian Cutler Formation of Colorado in the United States. The type species, O. sanmiguelensis, was originally named as a species of Diadectes in 1965. It was given its own genus in 2010. DescriptionThe only material belonging to Oradectes is a partial skeleton known as MCZ 2989. This skeleton includes a complete skull, neck vertebrae, a partial pectoral girdle, the right forelimb, and some ribs. The skull is robust with spade-shaped teeth lining the jaws. The front teeth of the lower jaw protrude outward. A ventral border of the Meckelian fenestra of the lower jaw formed entirely from the splenial bone is a distinguishing feature of Oradectes found in no other diadectid.[1] ClassificationOradectes sanmiguelensis was described by Lewis and Vaughn (1965) as a species of Diadectes, D. sanmiguelensis. In a 2005 phylogenetic study of diadectids, D. sanmiguelensis was found to be one of the most basal diadectids and was placed far from a clade containing most of the other species of Diadectes.[2] A 2010 analysis came up with the same results and assigned D. sanmiguelensis to the new genus Oradectes. Below is a cladogram from the 2010 study showing the phylogenetic position of Oradectes:[1]{{clade| style=font-size:100%;line-height:85%|label1=Diadectomorpha |1={{clade |1=Limnoscelidae |2={{clade |1=Tseajaiidae |label2= Diadectidae |2={{clade |1=Ambedus pusillus |2={{clade |1=Oradectes sanmiguelensis |2={{clade |1=Orobates pabsti |2={{clade |1=Desmatodon hesperis |2={{clade |1=Silvadectes absitus |2={{clade |1=Diadectes tenuitectes |2=Diadectes sideropelicus |3=Diasparactus zenos }} }} }} }} }} }} }} }} }} References1. ^1 {{cite book |last=Kissel |first=R. |year=2010 |title=Morphology, Phylogeny, and Evolution of Diadectidae (Cotylosauria: Diadectomorpha) |hdl=1807/24357 |publisher=University of Toronto Press |location=Toronto |pages=185}} {{Portal|Paleontology}}{{Taxonbar|from=Q7099320}}{{Early tetrapods}}{{paleo-amphibian-stub}}2. ^{{cite journal |last=Kissel |first=R. |author2=Reisz, R. |author3= Berman, D. |year=2005 |title=Revisiting the taxonomy of Diadectidae (Cotylosauria: Diadectomorpha): a phylogenetic approach |journal=Journal of Vertebrate Paleontology |volume=25 |issue=Supplement 3 |pages=78A|doi=10.1080/02724634.2005.10009942}} 2 : Diadectids|Permian vertebrates of North America |
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