New leptoceratopsids from the Upper Cretaceous of Alberta, Canada

被引：33
|
作者：
Ryan, Michael J. [1 ]
Evans, David C. [2 ,3 ]
Currie, Philip J. [4 ]
Brown, Caleb M. [3 ]
Brinkman, Don [5 ]
机构：
[1] Cleveland Museum Nat Hist, Dept Vertebrate Paleontol, Cleveland, OH 44106 USA
[2] Royal Ontario Museum, Dept Nat Hist, Toronto, ON M5S 2C6, Canada
[3] Univ Toronto, Dept Ecol & Evolutionary Biol, Toronto, ON M5S 3B2, Canada
[4] Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada
[5] Royal Tyrrell Museum Palaeontol, Drumheller, AB T0J OY0, Canada
来源：
CRETACEOUS RESEARCH | 2012年 / 35卷
关键词：
Ceratopsia; Leptoceratopsidae; Campanian; Santonian; Systematics; Evolution; 2 MEDICINE FORMATION; NEOCERATOPSIA; DINOSAURIA; CERATOPSIA;
D O I：
10.1016/j.cretres.2011.11.018
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Two new leptoceratopsid neoceratopsians are described based on partial dentaries collected from the Dinosaur Park (Campanian) and Milk River (Santonian) formations of Alberta. The new Campanian taxon has a unique dentary tooth shape not shared by other leptoceratopsid taxa, which has implications for the evolution of the Leptoceratopsidae. The Santonian specimen represents the oldest known leptoceratopsid (similar to 83 Ma), and probably represents the smallest adult-sized ceratopsian known from North America. (C) 2011 Elsevier Ltd. All rights reserved.
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页码：69 / 80
页数：12
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