Project 802: S. Apesteguia, R. O. Gomez, G.W. Rougier. 2012. A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: new insights on the phylogeny and biogeography of Gondwanan rhynchocephalians. Zoological Journal of the Linnean Society. 166 (2):342-360.
Abstract
Herein we describe a new rhynchocephalian taxon from the Middle Jurassic of Patagonia, Argentina, representing the first Jurassic record of the group in South America. The new taxon, consisting of a complete dentary, is ascribed to Sphenodontia based on the presence of a deep and wide Meckelian groove, long posterior process, well-developed coronoid process, and acrodont teeth showing dental regionalization including successional, alternate hatchling, and additional series. This allocation is reinforced by a phylogenetic analysis that places the new taxon in a basal position within a clade of sphenodontians that excludes Diphydontosaurus and Planocephalosaurus. Additionally, the new taxon clusters within a Gondwanan clade with the Indian Godavarisaurus from the Jurassic Kota Formation, sharing the presence of recurved and relatively large posterior successional teeth that are ribbed and bear a peculiar anterolingual groove. This sister-group relationship is intriguing from a palaeobiogeographical viewpoint, as it suggests some degree of endemism during the initial stages of the breakup of Pangaea. We also discuss the ontogenetic stage of the new taxon and provide insights on the evolution of successional dentition in rhynchocephalians.Read the article »
Article DOI: 10.1111/j.1096-3642.2012.00837.x
Project DOI: 10.7934/P802, http://dx.doi.org/10.7934/P802
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 1147 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 73 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 173 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:0/73 |
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MorphoBank Project 802
MorphoBank Project 802
- Creation Date:
08 October 2012 - Publication Date:
06 February 2013 - Project views: 44108
- Media downloads: 2
- Matrix downloads: 15
Authors' Institutions
- University of Louisville
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
MorphoBank Curator Project Administrator | 27 | 1 | 1 | 73 | 0 | 0 | 1147 (1147, 0, 0) | 0 | 0 | 0 | ||||
Maureen Admin Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||
Sebastian Apesteguia Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M1829' (26 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Youngina Last Modified in 12/05/13 | 8 | 65 | 65 | 0 | 0 | 0 | 0 | 3 |
[2] † Pristidactylus Last Modified in 12/05/13 | 17 | 56 | 56 | 0 | 0 | 0 | 0 | 3 |
[3] † Gephyrosaurus Last Modified in 12/05/13 | 10 | 63 | 63 | 0 | 0 | 0 | 0 | 3 |
[4] † Diphydontosaurus Last Modified in 12/05/13 | 2 | 71 | 71 | 0 | 0 | 0 | 0 | 3 |
[5] † Planocephalosaurus Last Modified in 12/05/13 | 4 | 71 | 69 | 0 | 0 | 0 | 0 | 3 |
[6] † Rebbanasaurus Last Modified in 12/05/13 | 43 | 31 | 30 | 0 | 0 | 0 | 0 | 3 |
[7] † Godavarisaurus Last Modified in 12/05/13 | 46 | 30 | 27 | 0 | 0 | 0 | 0 | 3 |
[8] † Homoeosaurus Last Modified in 12/05/13 | 18 | 58 | 55 | 0 | 0 | 0 | 0 | 3 |
[9] † Palaeopleurosaurus Last Modified in 12/05/13 | 9 | 64 | 64 | 0 | 0 | 0 | 0 | 3 |
[10] † Brachyrhinodon Last Modified in 12/05/13 | 22 | 51 | 51 | 0 | 0 | 0 | 0 | 3 |
[11] † Clevosaurus hudsoni Last Modified in 12/05/13 | 3 | 70 | 70 | 0 | 0 | 0 | 0 | 3 |
[12] † Kallimodon Last Modified in 12/05/13 | 13 | 60 | 60 | 0 | 0 | 0 | 0 | 3 |
[13] † Sapheosaurus Last Modified in 12/05/13 | 34 | 39 | 39 | 0 | 0 | 0 | 0 | 3 |
[14] † Pamizinsaurus Last Modified in 12/05/13 | 44 | 31 | 29 | 0 | 0 | 0 | 0 | 3 |
[15] † Zapatadon Last Modified in 12/05/13 | 37 | 37 | 36 | 0 | 0 | 0 | 0 | 3 |
[16] † Sphenodon Last Modified in 12/05/13 | 0 | 75 | 73 | 0 | 0 | 0 | 0 | 3 |
[17] † Cynosphenodon Last Modified in 12/05/13 | 48 | 25 | 25 | 0 | 0 | 0 | 0 | 3 |
[18] † Opisthias Last Modified in 12/05/13 | 26 | 47 | 47 | 0 | 0 | 0 | 0 | 3 |
[19] † Toxolophosaurus Last Modified in 12/05/13 | 54 | 19 | 19 | 0 | 0 | 0 | 0 | 3 |
[20] † Eilenodon Last Modified in 12/05/13 | 44 | 29 | 29 | 0 | 0 | 0 | 0 | 3 |
[21] † Kaikaifilusaurus avelasi Last Modified in 12/05/13 | 8 | 65 | 65 | 0 | 0 | 0 | 0 | 3 |
[22] † Ankylosphenodon Last Modified in 12/05/13 | 49 | 24 | 24 | 0 | 0 | 0 | 0 | 3 |
[23] † Sphenocondor Last Modified in 12/05/13 | 54 | 21 | 19 | 0 | 0 | 0 | 0 | 3 |
[24] † Sphenovipera Last Modified in 12/05/13 | 54 | 20 | 19 | 0 | 0 | 0 | 0 | 3 |
[25] † Theretairus Last Modified in 12/05/13 | 58 | 15 | 15 | 0 | 0 | 0 | 0 | 3 |
[26] † Kawasphenodon Last Modified in 12/05/13 | 63 | 10 | 10 | 0 | 0 | 0 | 0 | 3 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 44108 | |
Project overview | 4324 | |
Documents list | 2303 | |
Matrix views | 3243 | Matrix landing page (2783 views); Sphenocondor matrix (460 views); |
Media views | 7408 | Media search (6431 views); M149580 (977 views); |
Specimen list | 3442 | |
Taxon list | 21834 | |
Bibliography | 1554 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 404 | |
Document downloads | 2 | Copyright Permission (2 downloads); |
Matrix downloads | 15 | Sphenocondor matrix (15 downloads); |
Project downloads | 385 | |
Media downloads | 2 | M149580 (2 downloads); |