Thescelosaurus assiniboiensis Brown & Boyd & Russell 2011, SP. NOV.

• Main Authors: Brown, Caleb Marshall, Boyd, Clint A., Russell, Anthony P.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Chordata; Reptilia; Ornithischia; Hypsilophodontidae; Thescelosaurus; Thescelosaurus assiniboiensis; First Nations
• Online Access: https://doi.org/10.5281/zenodo.10545886; http://treatment.plazi.org/id/C80587E1FFA40256FF1E0848B5DC1C9A

THESCELOSAURUS ASSINIBOIENSIS SP. NOV. 1989 Thescelosaurus neglectus Galton: pl. 4, figs 1–8; Galton 1995: fig. 4; Galton 1997: figs 3, 4, 10, pl. 1–2. Diagnosis: Dorsal and posterior margins of the squamosal convex; supraoccipital bearing a distinct median foramen running from the roof of the myelencephalon through to the dorsal surface of the element. Differentiated from T. garbanii by the calcaneum not being reduced and thus participating in the mesotarsal joint. Specific etymology: Named for the District of Assiniboia, a regional administrative unit of the North- West Territories, Canada, from 1882 to 1905 (located between 49° and 51.97°N, and ~101.5 and ~ 111.5°W). The majority of this district became the southern portion of the modern province of Saskatchewan, with the westernmost area becoming the easternmost portion of the province of Alberta. It encloses the exposures of the Frenchman Formation. This district was named after the Assiniboine First Nations People. Holotype: RSM P 1225.1, a small, relatively complete skeleton, preserving a partial skull (including a nearly complete braincase), dorsal, sacral, and caudal vertebral series, dorsal ribs, pelvic girdles, and hindlimbs. Based on the 1968 quarry map, the skeleton was found in articulated condition, with the anterior part of the animal extending into the hill, but with the tail exposed. Locality: Specimen RSM P 1225.1 was discovered on 19 June 1968 and collected by Albert E. Swanston of the Royal Saskatchewan Museum (then the Saskatchewan Museum of Natural History) on 17 July 1968. The original location, stated as ‘northwest of Clarks Ranch, from NW 1/4 Sec 35, T 4, R 19, west of the 3 rd Meridian, Frenchman River Valley, Saskatchewan’, is incorrect. Tim Tokaryk (RSM) relocated the original site in the late 1980s (with the relocation being confirmed by the matching of a rib fragment collected at the site with a rib of the specimen, and residual plaster persisting at the site; T. T. Tokaryk, pers. comm., 2007). Located in LSD 11, Sec 2, T 5, R 19, ...