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| - Avaceratops was a small ceratopsian herbivore it is categorized as a bleeder damage type with limited night vision and a social and easily startled temperament and noted to have a overall stamina of a low metabolic rate.
- The first remains of Avaceratops were found by fossil dealer Eddie Cole in the Judith River Formation of Montana, in 1981, on land of the Careless Creek Ranch, owned by rancher Arthur J. Lammers.[1] They were preserved scattered throughout the remains of a prehistoric stream bed.[1] This Avaceratops specimen was likely buried in the sandbar after its body was swept downstream by the current.[1] The finds, displayed in Cole's fossil shop, were in October 1981 inspected by Peter Dodson who in July 1982 during a visit with Cole to the site discovered additional bones, which from 1984 were excavated by Anthony Fiorillo.[2]
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| - The first remains of Avaceratops were found by fossil dealer Eddie Cole in the Judith River Formation of Montana, in 1981, on land of the Careless Creek Ranch, owned by rancher Arthur J. Lammers.[1] They were preserved scattered throughout the remains of a prehistoric stream bed.[1] This Avaceratops specimen was likely buried in the sandbar after its body was swept downstream by the current.[1] The finds, displayed in Cole's fossil shop, were in October 1981 inspected by Peter Dodson who in July 1982 during a visit with Cole to the site discovered additional bones, which from 1984 were excavated by Anthony Fiorillo.[2] The fossil was formally named and described by Dodson in 1986, as the type species Avaceratops lammersi.[3] It was the first ceratopsid named since Pachyrhinosaurus in 1950.[2] The genus was named after Ava Cole, Eddie's wife.[1] The specific epithet honors the Lammers family.[1] In 1990 George Olshevsky emended the name to A. lammersorum, with the specific name in the genitive plural because it referred to several persons.[4] However, Dodson objected against this change, arguing the genitive singular might also refer to a single family name.[2] The holotype, ANSP 15800, consists of a partial skeleton containing the lower skull, a left lower jaw, vertebrae, a complete shoulder girdle and most elements of forelimbs and hindlimbs. The type specimen might represent a juvenile or a subadult individual, Dodson in 1986 being inclined to consider it almost fully grown.[3] Kenneth Carpenter made a reconstruction of the skull, a cast of which was by Leroy Glenn combined with restored parts of the postcranial skeleton to create a mount that in 1986 was displayed in the Academy of Natural Sciences in Philadelphia; a copy of this skeletal mount was donated to the Upper Musselshell Valley Historical Museum in Harlowton.[2] In 1993 Paul Penkalski referred two earlier found squamosals to Avaceratops, USNM 4802 and USNM 2415, of larger individuals.[5] In 1999 Penkalski and Dodson described a second skull, MOR 692, again of a larger individual. This specimen includes the upper skull, with the nose and brow horns.[6] In 1990 Thomas Lehman renamed A. lammersi into Monoclonius lammersi;[7] in 2010 the species was by Gregory S. Paul renamed into Centrosaurus lammersi.[8] Both alternative names have found no acceptance.
- Avaceratops was a small ceratopsian herbivore it is categorized as a bleeder damage type with limited night vision and a social and easily startled temperament and noted to have a overall stamina of a low metabolic rate.
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