Here we describe a new specimen of Othnielosaurus consors from the Upper Jurassic Morrison Formation. The specimen was found at the Howe Stephens Quarry (Wyoming, USA) and represents the most complete and largest single skeleton currently known for this taxon. The postcranial skeleton is virtually complete except for the forelimbs, which are only partially preserved. The specimen exhibits the most complete cranial material (including a relatively well-preserved lower jaw and a right maxilla) found in a single individual of the taxon. The preservation quality of the bones varies from relatively well preserved to heavily crushed. Slight differences between this skeleton and other specimens referred to Othnielosaurus consors are noted, but are explained by either individual or ontogenetic variation or the preservation quality of the specimen. Whether the size difference in comparison with other specimens is related to ontogeny or sexual dimorphism cannot be determined currently. A phylogenetic analysis recovers Othnielosaurus consors with the new character scorings as a member of Neornithischia and sister taxon to Cerapoda. This result differs from earlier assessments, which referred to the taxon as a ‘hypsilophodontid’ or basal ornithopod, and is in agreement with relatively recent phylogenetic studies.
|Number of pages||1|
|Publication status||Published - Dec 2015|
|Event||Palaeontological Association Annual Meeting 2015 - Cardiff University, Cardiff, United Kingdom|
Duration: 14 Dec 2015 → 17 Dec 2015
|Conference||Palaeontological Association Annual Meeting 2015|
|Period||14/12/15 → 17/12/15|
- Morrison Formation