Leptoceratopsidae

Leptoceratopsidae
	Historical skeleton reconstruction of Montanoceratops (1942)
Temporal occurrence
	Upper Cretaceous ( Campanium to Maastrichtian )
	83.6 to 66 million years
Locations
	North America;
Systematics
	Pelvic dinosaur (Ornithischia)
	Cerapoda
	Marginocephalia
	Ceratopsia
	Neoceratopsia
	Leptoceratopsidae
Scientific name
	Leptoceratopsidae
	Nopcsa , 1923

The Leptoceratopsidae (also Leptoceratopidae ) are a taxon (a systematic group) of the dinosaurs from the group of Ceratopsia . They include some smaller animals living in the Upper Cretaceous in what is now North America .

The animals in this group were relatively small dinosaurs. As with all Ceratopsia, the snout was formed from the Rostral Bone and the Praedentale . The neck shield typical of the more highly developed Ceratopsia was located on the neck. The teeth were geared towards a plant-based diet, but in contrast to the tooth batteries of the Ceratopsidae , they were simply built.

The systematics within the Ceratopsia is controversial. According to phylogenetic studies, Leptoceratops and Montanoceratops form a well-defined clade and the "core" of the Leptoceratopsidae. These animals were previously classified in the Protoceratopsidae , but are now run as a separate family Leptoceratopsidae. As defined by P. Makovicky, the Leptoceratopsidae include all taxa more closely related to Leptoceratops than to Triceratops .

The following genera may be included:

All of these genera lived in the Upper Cretaceous ( Campanium and Maastrichtian ) in what is now North America. The affiliation of the Asiatic forms Bainoceratops and Udanoceratops is controversial - some characteristics speak for an affiliation to the Protoceratopsidae - as well as that of some poorly preserved taxa ( Asiaceratops and Serendipaceratops ). The genus Cerasinops , discovered in 2007, is possibly the sister taxon of the Leptoceratopsidae.

The external system is also controversial. According to P. Makovicky, the Leptoceratopsidae form the sister taxon of a group of Protoceratopsidae and Ceratopsoidea ( Zuniceratops and Ceratopsidae ). According to You et al. however, the Leptoceratopsidae are more closely related to the Ceratopsoidea than to the Protoceratopsidae. Paleobiogeographically, the second variant would be more plausible, since it would result in a clade that only occurs in North America and is opposed to the Asian Protoceratopsidae.

literature

You Hailu, Peter Dodson : Basal Ceratopsia. In: David B. Weishampel , Peter Dodson, Halszka Osmólska (eds.): The Dinosauria . 2nd edition. University of California Press, Berkeley CA et al. 2004, ISBN 0-520-24209-2 , pp. 478-493, digitized version (PDF; 807.25 kB) .
David E. Fastovsky , David B. Weishampel: The Evolution and Extinction of the Dinosaurs. 2nd edition. Cambridge University Press, Cambridge et al. 2005, ISBN 0-521-81172-4 .

Web links

Commons : Leptoceratopsidae - Collection of Images, Videos and Audio Files

Individual evidence

^ Gregory S. Paul : The Princeton Field Guide To Dinosaurs. Princeton University Press, Princeton NJ et al. 2010, ISBN 978-0-691-13720-9 , pp. 253-254, online .
^ ^A ^b Peter J. Makovicky : A Montanoceratops cerorhynchus (Dinosauria: Ceratopsia) braincase from the Horseshoe Canyon Formation of Alberta. In: Darren H. Tanke, Kenneth Carpenter (Eds.): Mesozoic Vertebrate Life. Indiana University Press et al., Bloomington IN et al. 2001, ISBN 0-253-33907-3 , pp. 243-262.
↑ Victoria M. Arbor and David C. Evans. 2019. A New Leptoceratopsid Dinosaur from Maastrichtian-aged Deposits of the Sustut Basin, northern British Columbia, Canada. PeerJ. 7: e7926. DOI: 10.7717 / peerj.7926
↑ ^a ^b Michael J. Ryan, David C. Evans, Philip J. Currie , Caleb M. Brown, Don Brinkman: New leptoceratopsids from the Upper Cretaceous of Alberta, Canada. In: Cretaceous Research. Vol. 35, 2012, ISSN 0195-6671 , pp. 69-80, doi : 10.1016 / j.cretres.2011.11.018 .

[1] Gregory S. Paul : The Princeton Field Guide To Dinosaurs. Princeton University Press, Princeton NJ et al. 2010, ISBN 978-0-691-13720-9 , pp. 253-254, online .

[Makovicky-2] A ^b Peter J. Makovicky : A Montanoceratops cerorhynchus (Dinosauria: Ceratopsia) braincase from the Horseshoe Canyon Formation of Alberta. In: Darren H. Tanke, Kenneth Carpenter (Eds.): Mesozoic Vertebrate Life. Indiana University Press et al., Bloomington IN et al. 2001, ISBN 0-253-33907-3 , pp. 243-262.

[3] Victoria M. Arbor and David C. Evans. 2019. A New Leptoceratopsid Dinosaur from Maastrichtian-aged Deposits of the Sustut Basin, northern British Columbia, Canada. PeerJ. 7: e7926. DOI: 10.7717 / peerj.7926

[Ryan_et_al.-4] Michael J. Ryan, David C. Evans, Philip J. Currie , Caleb M. Brown, Don Brinkman: New leptoceratopsids from the Upper Cretaceous of Alberta, Canada. In: Cretaceous Research. Vol. 35, 2012, ISSN 0195-6671 , pp. 69-80, doi : 10.1016 / j.cretres.2011.11.018 .