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AVACERATOPS

a centrosaurine ceratopsid (horn faced) dinosaur from the Late Cretaceous of North America.
avaceratops.png
Pronunciation: AY-vuh-SEH-ruh-tops
Meaning: Ava's horned face
Author/s: Dodson (1986)
Synonyms: None known
First Discovery: Montana, USA
Chart Position: 261

Avaceratops lammersi

The first remains of Avaceratops were found strewn around a pre-historic stream bed now known as the Judith River Formation in 1981. Despite an obvious lack of horns due solely to the fact it was missing the part of the skull that horns were or may have been attached to, it was classified as a ceratopsid —the dinosaurs known colloquially as "horn faces"—because of a customery albeit modest neck frill, and as a centrosaurine ceratopsid, which have the horniest faces of all, at least as adults.

Compared to its monstrous ceratopsian relatives, Avaceratops was small, which led some experts to muse that it was a juvenile example of another species, possibly the ultra-obscure Ceratops montanus, which isn't even a centrosaurine. And the same folks won't entertain a juvenile specimen being installed as name-bearer because the scope for change as the critter matures is huge, much to the chagrin of its describer Peter Dodson. The juvenile status of the first Avaceratops was seemingly confirmed with the discovery of a much larger skull in 1991 which increased its estimated total body length from 2.3 to 4.2 meters based on proportionate upscaling, and should have been glorious news. However, eyebrows were raised once again, due not only to its discovery 125km and 2 million years from the holotype quarry but also to the presence of 25cm brow horns that are strikingly similar to those of... Ceratops mantanus.
Etymology
Avaceratops is derived from Ava (for Ava Cole, the wife of Eddie Cole who found the first specimen), and the Greek "ceras" (horned) and "ops" (face). The species epithet, lammersi, honors the Lammers family, owners of the land where the holotype fossils were found.
Discovery
The first fossils of Avaceratops were discovered at Careless Creek Quarry in the Judith River Formation of Montana, U.S.A, by Eddie Cole in September, 1981.
The holotype (ANSP 15800) is a partial skull and skeleton.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 80-73 mya
Stats:
Est. max. length: 2.5 meters
Est. max. hip height: ?
Est. max. weight: 300 Kg
Diet: Herbivore
References
• Dodson P (1986) "Avaceratops lammersi: a new ceratopsid from the Judith River Formation of Montana". Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. 138, No. 2, pp. 305-317.
• Dodson P (1998) "The Horned Dinosaurs: a Natural History".
• Penkalski P and P Dodson (1999) "The morphology and systematics of Avaceratops, a primitive horned dinosaur from the Judith River Formation (Late Campanian) of Montana, with the description of a second skull". Journal of Vertebrate Paleontology, Vol. 19, No. 4, pp. 692-711.
• Paul GS (2010) "The Princeton Field Guide to Dinosaurs". Page 264.
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To cite this page:
Atkinson, L. "AVACERATOPS :: from DinoChecker's dinosaur archive".
›. Web access: 16th Aug 2017.
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