Project 984: N. R. Longrich, K. Barnes, S. Clark, L. Millar. 2013. Caenagnathidae from the Upper Campanian Aguja Formation of West Texas, and a Revision of the Caenagnathinae. Bulletin of the Peabody Museum of Natural History. 54 (1):23-49.
Abstract
Caenagnathid theropods are a relatively common part of the theropod fauna in the Late Cretaceous of Asia and North America, but have not previously been described from the southernmost United States. Here, we describe caenagnathid fossils from the late Campanian Aguja Formation of West Texas, and revise the systematics of caenagnathids from the Campanian of North America. Caenagnathids from the late Campanian of Canada represent three species in three genera: Caenagnathus collinsi, Chirostenotes pergracilis and Leptorhynchos elegans gen. nov. Leptorhynchos is diagnosed by its small size, its short, deep mandible, and the upturned tip of the beak. A single caenagnathid is known from the late Campanian of Utah, Hagryphus giganteus. Two caenagnathid species occur in the Aguja Formation, ?Chirostenotes sp. and Leptorhynchos gaddisi sp. nov. L. gaddisi differs from L. elegans in that the tip of the beak is narrower and less upturned. Phylogenetic analysis recovers Caenagnathidae and Oviraptoridae as monophyletic sister taxa. Within Caenagnathidae, the North American species seem to form a monophyletic assemblage, the Caenagnathinae, within which Chirostenotes and Caenagnathus form a clade to the exclusion of Leptorhynchos. The discovery of Chirostenotes gaddisi provides more evidence for the existence of a distinct dinosaurian fauna in southern North America during the Campanian. Furthermore, the Aguja fossils show that caenagnathids were widespread and highly diverse in the Late Cretaceous of North America. This diversity was maintained in two ways. First, variation in body size and beak shape suggests that diversity within formations is maintained by niche partitioning, in a way analogous to Darwin's finches. Second, diversity is maintained by high degree of endemism, with different species of caenagnathids occurring in different habitats.Read the article »
Article DOI: 10.3374/014.054.0102
Project DOI: 10.7934/P984, http://dx.doi.org/10.7934/P984
This project contains | Matrices |
---|---|
Download Project SDD File | Total scored cells: 2558 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 205 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 644 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:205/0 |
Currently Viewing:
MorphoBank Project 984
MorphoBank Project 984
- Creation Date:
03 July 2013 - Publication Date:
20 May 2016 - Project views: 34485
- Matrix downloads: 1
Authors' Institutions
- Yale University
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
MorphoBank Curator Project Administrator | 28 | 1 | 5 | 205 | 0 | 0 | 2558 (2553, 0, 5) | 0 | 0 | 0 | ||||
Maureen Admin Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||
Seth Kaufman | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||
Nicholas Longrich Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M2208' (28 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Herrerasaurus Last Modified in 05/20/16 | 14 | 191 | 191 | 0 | 0 | 0 | 0 | 4 |
[2] † Velociraptor Last Modified in 05/20/16 | 4 | 200 | 200 | 0 | 1 | 0 | 0 | 4 |
[3] † Archaeopteryx lithographica Last Modified in 05/20/16 | 33 | 171 | 171 | 0 | 1 | 0 | 0 | 4 |
[4] † Incisivosaurus gauthieri Last Modified in 05/20/16 | 98 | 107 | 107 | 0 | 0 | 0 | 0 | 4 |
[5] † Caudipteryx zoui Last Modified in 05/20/16 | 85 | 120 | 120 | 0 | 0 | 0 | 0 | 4 |
[6] † Avimimus portentosus Last Modified in 05/20/16 | 97 | 108 | 108 | 0 | 0 | 0 | 0 | 4 |
[7] † Microvenator celer Last Modified in 05/20/16 | 148 | 56 | 55 | 0 | 2 | 0 | 0 | 4 |
[8] † Oviraptor Last Modified in 05/20/16 | 149 | 56 | 56 | 0 | 0 | 0 | 0 | 4 |
[9] † Rinchenia mongoliensis Last Modified in 05/20/16 | 49 | 156 | 156 | 0 | 0 | 0 | 0 | 4 |
[10] † Citipati osmolskae Last Modified in 05/20/16 | 87 | 118 | 118 | 0 | 0 | 0 | 0 | 4 |
[11] † Zamin khondt Last Modified in 05/20/16 | 10 | 195 | 195 | 0 | 0 | 0 | 0 | 4 |
[12] † Khaan mckennai Last Modified in 05/20/16 | 62 | 143 | 143 | 0 | 0 | 0 | 0 | 4 |
[13] † Conchoraptor Last Modified in 05/20/16 | 40 | 165 | 165 | 0 | 0 | 0 | 0 | 4 |
[14] † Machairasaurus Last Modified in 05/20/16 | 192 | 13 | 13 | 0 | 0 | 0 | 0 | 4 |
[15] † Nemegtomaia Last Modified in 05/20/16 | 56 | 150 | 149 | 0 | 0 | 0 | 0 | 4 |
[16] † Heyuannia Last Modified in 05/20/16 | 139 | 65 | 65 | 0 | 1 | 0 | 0 | 4 |
[17] † Ingenia Last Modified in 05/20/16 | 47 | 158 | 158 | 0 | 0 | 0 | 0 | 4 |
[18] † Gigantoraptor erlianensis Last Modified in 05/20/16 | 128 | 77 | 77 | 0 | 0 | 0 | 0 | 4 |
[19] † Caenagnathasia martinsoni Last Modified in 05/20/16 | 185 | 20 | 20 | 0 | 0 | 0 | 0 | 4 |
[20] † Leptorhynchos elegans Last Modified in 05/20/16 | 175 | 31 | 30 | 0 | 0 | 0 | 0 | 4 |
[21] † Leptorhynchos gaddisi Last Modified in 05/20/16 | 186 | 21 | 19 | 0 | 0 | 0 | 0 | 4 |
[22] † C. pergracilis Last Modified in 05/20/16 | 122 | 84 | 83 | 0 | 0 | 0 | 0 | 4 |
[23] † Caenagnathus collinsi Last Modified in 05/20/16 | 165 | 40 | 40 | 0 | 0 | 0 | 0 | 4 |
[24] † C. sp. hell creek Last Modified in 05/20/16 | 191 | 14 | 14 | 0 | 0 | 0 | 0 | 4 |
[25] † Hagryphus giganteus Last Modified in 05/20/16 | 194 | 11 | 11 | 0 | 0 | 0 | 0 | 4 |
[26] † Elmisaurus rarus Last Modified in 05/20/16 | 188 | 17 | 17 | 0 | 0 | 0 | 0 | 4 |
[27] † Nomingia Last Modified in 05/20/16 | 165 | 40 | 40 | 0 | 0 | 0 | 0 | 4 |
[28] † Epichirostenotes currei Last Modified in 05/20/16 | 179 | 26 | 26 | 0 | 0 | 0 | 0 | 4 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 34485 | |
Project overview | 2841 | |
Matrix views | 2071 | Matrix landing page (1778 views); Leptorhynchos Matrix (293 views); |
Media views | 8626 | Media search (4473 views); M305410 (744 views); M305413 (740 views); M305414 (791 views); M305415 (775 views); M305416 (1103 views); |
Taxon list | 14107 | |
Specimen list | 2356 | |
Views for media list | 3445 | |
Bibliography | 1033 | |
Documents list | 6 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 226 | |
Project downloads | 225 | |
Matrix downloads | 1 | Leptorhynchos Matrix (1 download); |