Project 871: Eugene S. Gaffney, Thomas H. V. Rich, Pat Vickers Rich, Andrew Eric Constantine, Raul Vacca, Lesley Kool. 2007. Chubutemys, a new eucryptodiran turtle from the early Cretaceous of Argentina, and the relationships of the Meiolaniidae. American Museum Novitates. 3599.
Abstract
Chubutemys copelloi is the oldest nonmarine cryptodire from South America represented by a skull. The skull and associated postcranial fragments are from the Aptian Cerro CostaŠno Member of the Cerro Barcino Formation of Chubut, Argentina. Chubutemys has a processus trochlearis oticum, showing that it is a cryptodire, and an enclosed canalis caroticus internus extending to the posterior margin of the pterygoid, showing that it is a eucryptodire. The skull of Chubutemys is similar to that of other primitive eucryptodires, particularly Dracochelys, but also to Hangaiemys, Judithemys, Sinemys, and Ordosemys. Chubutemys differs from all these, however, in possessing a solidly roofed skull, formed by long, wide parietals, rather than a posterior emargination. Chubutemys also differs from these taxa in having no cheek emargination. A phylogenetic analysis using PAUP* analyzed 104 parsimony-informative characters resolving into one most parsimonious cladogram of 224 steps, a consistency index of 0.55, and a retention index of 0.74. The phylogenetic analysis weakly joins Chubutemys and meiolaniids on the basis of the prefrontal-postorbital contact. Chubutemys also has a fully roofed skull and slitlike posterior opening of the foramen caroticum laterale (foramen posterius canalis caroticus laterale), features to be expected in a meiolaniid sister taxon. Chubutemys provides further evidence that meiolaniids are related to 'basal' eucryptodires ('sinemydids/macrobaenids'), that is, eucryptodires outside the living Cryptodira, the Polycryptodira. The basicranial morphology of meiolaniids, with an intrapterygoid slit, rather than being a unique feature of the group is instead a modified state of the primitive eucryptodire condition, as seen in such forms as Chubutemys, Dracochelys, Ordosemys, and Sinemys. The intrapterygoid slit of meiolaniids is homologous with the pterygoid flange associated with the foramen caroticum laterale (foramen posterius canalis caroticus laterale of Sukhanov) in non-Polycryptodiran eucryptodires like Ordosemys. Chubutemys shows that nonmarine eucryptodires were present in South America in the Cretaceous, as they were in North America, central Asia, and AustraliaRead the article »
Project DOI: 10.7934/P871, http://dx.doi.org/10.7934/P871
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 2512 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 111 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 242 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:111/0 |
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MorphoBank Project 871
MorphoBank Project 871
- Creation Date:
28 January 2013 - Publication Date:
01 April 2013 - Project views: 41633
- Matrix downloads: 9
Authors' Institutions
- Museo Paleontológico Egidio Feruglio
- Monash University
- American Museum of Natural History
- Origin Energy, Brisbane
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
MorphoBank Curator Project Administrator | 28 | 2 | 1 | 111 | 0 | 0 | 2512 (2512, 0, 0) | 0 | 0 | 0 | ||||
Maureen Admin Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||
Eugene Gaffney Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M1949' (28 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] Synapsida/Diapsida Last Modified in 12/05/13 | 27 | 84 | 84 | 0 | 0 | 0 | 0 | 3 |
[2] † Proganochelys Last Modified in 12/05/13 | 2 | 109 | 109 | 0 | 0 | 0 | 0 | 3 |
[3] † Australochelys Last Modified in 12/05/13 | 66 | 45 | 45 | 0 | 0 | 0 | 0 | 3 |
[4] † Palaeochersis Last Modified in 12/05/13 | 36 | 75 | 75 | 0 | 0 | 0 | 0 | 3 |
[5] † Proterochersis Last Modified in 12/05/13 | 88 | 23 | 23 | 0 | 0 | 0 | 0 | 3 |
[6] Megapleurodira Last Modified in 12/05/13 | 1 | 127 | 110 | 0 | 0 | 0 | 0 | 3 |
[7] † Kayentachelys Last Modified in 12/05/13 | 5 | 106 | 106 | 0 | 0 | 0 | 0 | 3 |
[8] † Kallokibotion Last Modified in 12/05/13 | 11 | 100 | 100 | 0 | 0 | 0 | 0 | 3 |
[9] † Mongolochelys Last Modified in 12/05/13 | 9 | 102 | 102 | 0 | 0 | 0 | 0 | 3 |
[10] † Pleurosternidae Last Modified in 12/05/13 | 3 | 111 | 108 | 0 | 0 | 0 | 0 | 3 |
[11] † Baenidae Last Modified in 12/05/13 | 1 | 113 | 110 | 0 | 0 | 0 | 0 | 3 |
[12] † Xinjiangchelys Last Modified in 12/05/13 | 41 | 72 | 70 | 0 | 0 | 0 | 0 | 3 |
[13] † Solnhofia Last Modified in 12/05/13 | 20 | 91 | 91 | 0 | 0 | 0 | 0 | 3 |
[14] † Plesiochelyidae Last Modified in 12/05/13 | 3 | 110 | 108 | 0 | 0 | 0 | 0 | 3 |
[15] † Meiolania Last Modified in 12/05/13 | 5 | 107 | 106 | 0 | 0 | 0 | 0 | 3 |
[16] † Ninjemys Last Modified in 12/05/13 | 67 | 44 | 44 | 0 | 0 | 0 | 0 | 3 |
[17] † Niolamia Last Modified in 12/05/13 | 58 | 53 | 53 | 0 | 0 | 0 | 0 | 3 |
[18] † Chubutemys Last Modified in 12/05/13 | 55 | 56 | 56 | 0 | 0 | 0 | 0 | 3 |
[19] † Sinemys Last Modified in 12/05/13 | 14 | 97 | 97 | 0 | 0 | 0 | 0 | 3 |
[20] † Otwayemys Last Modified in 12/05/13 | 76 | 35 | 35 | 0 | 0 | 0 | 0 | 3 |
[21] † Hangaiemys Last Modified in 12/05/13 | 21 | 90 | 90 | 0 | 0 | 0 | 0 | 3 |
[22] † Dracochelys Last Modified in 12/05/13 | 33 | 78 | 78 | 0 | 0 | 0 | 0 | 3 |
[23] † Ordosemys Last Modified in 12/05/13 | 16 | 95 | 95 | 0 | 0 | 0 | 0 | 3 |
[24] † Judithemys Last Modified in 12/05/13 | 9 | 102 | 102 | 0 | 0 | 0 | 0 | 3 |
[25] Chelydridae Last Modified in 12/05/13 | 0 | 117 | 111 | 0 | 0 | 0 | 0 | 3 |
[26] Chelonioidea Last Modified in 12/05/13 | 0 | 128 | 111 | 0 | 0 | 0 | 0 | 3 |
[27] Trionychoidea Last Modified in 12/05/13 | 0 | 122 | 111 | 0 | 0 | 0 | 0 | 3 |
[28] Testudinoidea Last Modified in 12/05/13 | 0 | 120 | 111 | 0 | 0 | 0 | 0 | 3 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 41633 | |
Matrix views | 3019 | Matrix landing page (2742 views); Chubutymys Matrix (277 views); |
Project overview | 4038 | |
Taxon list | 19193 | |
Media views | 7882 | Media search (5991 views); M219848 (1891 views); |
Specimen list | 3985 | |
Views for media list | 2059 | |
Bibliography | 1451 | |
Documents list | 6 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 401 | |
Matrix downloads | 9 | Chubutymys Matrix (9 downloads); |
Project downloads | 392 |