Project 713: J. L. Carballido, J. S. Marpmann, D. Schwarz-Wings, B. Pabst. 2012. New information on a juvenile sauropod specimen from the Morrison Formation and the reassessment of its systematic position. Palaeontology. Early View (March 12).
Abstract
Morphological changes in the ontogeny of sauropods are poorly known, making difficult to establish the systematic affinities of very young individuals. New information on an almost complete juvenile sauropod (SMA 0009) with an estimated total length of about 2 m is here presented. The specimen was described as a diplodocid owing to the presence of some putative synapomorphies of this group. However, recent further preparation revealed the absence of diplodocid characters and the presence of macronarian derived characters. To test the affinities of this specimen, a phylogenetic analysis was conducted. The strict consensus tree recovers the specimen as a basal titanosauriform, in an unresolved relation with Brachiosaurus and Giraffatitan. Nevertheless, a brachiosaurid assignment is here suggested in base of the widely accepted monophyly of this group (only recovered when SMA 0009 is placed within this group). Although the existence of a new taxon cannot be completely ruled out, the combination of derived and plesiomorphic characters in the specimen suggests its assignment to Brachiosaurus. Sixteen extra steps are needed to place this specimen within Diplodocidae. The high cost to place this specimen within this group is owing to the fact that several diplodocid characters are absent in SMA 0009, such as the absence of divided centroprezygapophyseal lamina in cervical vertebrae, procoelous anterior caudal centra, composed lateral lamina in anterior caudal vertebrae, elongated middle caudal vertebrae, short cervical ribs and caudolateral projection of distal condyle of metatarsal I. Finally, the systematic position reveals few major ontogenetic transformations. These affect the pneumatic structures (e.g. change from simple pleurocoels in the cervical vertebrae to complex pleurocoels and the development of lateral excavations in the dorsal vertebrae) but also include unrecorded transformations of the neural spine (e.g. the development of the spinodiapophyseal lamina, the widening of the neural spines in the dorsal vertebrae) and allometric growth in some limb bones.Read the article »
Project DOI: 10.7934/P713, http://dx.doi.org/10.7934/P713
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 6122 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 334 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 754 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:334/0 |
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MorphoBank Project 713
MorphoBank Project 713
- Creation Date:
17 April 2012 - Publication Date:
07 May 2013 - Project views: 43111
- Media downloads: 4
- Matrix downloads: 9
Authors' Institutions
- Museum für Naturkunde - Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Berlin
- Museo Paleontológico Egidio Feruglio
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
- Rheinische Friedrich-Wilhelms-Universität Bonn (University of Bonn)
- Sauriermuseum Aathal
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
MorphoBank Curator Project Administrator | 33 | 1 | 1 | 334 | 0 | 0 | 6122 (6091, 0, 31) | 0 | 0 | 0 | ||||
Maureen Admin Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | ||||
Jose Luis Carballido Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M2028' (32 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Prosauropoda Last Modified in 12/05/13 | 5 | 332 | 327 | 0 | 2 | 0 | 0 | 3 |
[2] † Theropoda Last Modified in 12/05/13 | 2 | 331 | 328 | 0 | 4 | 0 | 0 | 3 |
[3] † Vulcanodon Last Modified in 12/05/13 | 235 | 99 | 99 | 0 | 0 | 0 | 0 | 3 |
[4] † Barapasaurus Last Modified in 12/05/13 | 198 | 136 | 136 | 0 | 0 | 0 | 0 | 3 |
[5] † Omeisaurus Last Modified in 12/05/13 | 31 | 306 | 303 | 0 | 0 | 0 | 0 | 3 |
[6] † Shunosaurus Last Modified in 12/05/13 | 24 | 310 | 310 | 0 | 0 | 0 | 0 | 3 |
[7] † Patagosaurus Last Modified in 12/05/13 | 165 | 170 | 169 | 0 | 0 | 0 | 0 | 3 |
[8] † Mamenchisaurus Last Modified in 12/05/13 | 79 | 256 | 254 | 0 | 1 | 0 | 0 | 3 |
[9] † Apatosaurus Last Modified in 12/05/13 | 22 | 314 | 312 | 0 | 0 | 0 | 0 | 3 |
[10] † Barosaurus Last Modified in 12/05/13 | 214 | 120 | 120 | 0 | 0 | 0 | 0 | 3 |
[11] † B altithorax Last Modified in 12/05/13 | 250 | 84 | 84 | 0 | 0 | 0 | 0 | 3 |
[12] † B brancai Last Modified in 12/05/13 | 13 | 322 | 321 | 0 | 0 | 0 | 0 | 3 |
[13] † Camarasaurus Last Modified in 12/05/13 | 1 | 334 | 333 | 0 | 0 | 0 | 0 | 3 |
[14] † Dicraeosaurus Last Modified in 12/05/13 | 82 | 261 | 252 | 0 | 0 | 0 | 0 | 3 |
[15] † Diplodocus Last Modified in 12/05/13 | 19 | 318 | 315 | 0 | 0 | 0 | 0 | 3 |
[16] † Haplocanthosaurus Last Modified in 12/05/13 | 192 | 144 | 142 | 0 | 0 | 0 | 0 | 3 |
[17] † Amargasaurus Last Modified in 12/05/13 | 213 | 120 | 120 | 0 | 1 | 0 | 0 | 3 |
[18] † Euhelopus Last Modified in 12/05/13 | 155 | 179 | 179 | 0 | 0 | 0 | 0 | 3 |
[19] † Jobaria Last Modified in 12/05/13 | 101 | 233 | 233 | 0 | 0 | 0 | 0 | 3 |
[20] † Malawisaurus Last Modified in 12/05/13 | 178 | 156 | 156 | 0 | 0 | 0 | 0 | 3 |
[21] † Nigersaurus Last Modified in 12/05/13 | 258 | 69 | 69 | 0 | 7 | 0 | 0 | 3 |
[22] † Limaysaurus Last Modified in 12/05/13 | 144 | 183 | 182 | 0 | 8 | 0 | 0 | 3 |
[23] † Rebbachisaurus Last Modified in 12/05/13 | 301 | 33 | 33 | 0 | 0 | 0 | 0 | 3 |
[24] † Alamosaurus Last Modified in 12/05/13 | 186 | 145 | 145 | 0 | 3 | 0 | 0 | 3 |
[25] † Nemegtosaurus Last Modified in 12/05/13 | 242 | 91 | 91 | 0 | 1 | 0 | 0 | 3 |
[26] † Opisthocoelicaudia Last Modified in 12/05/13 | 133 | 197 | 197 | 0 | 4 | 0 | 0 | 3 |
[27] † Rapetosaurus Last Modified in 12/05/13 | 97 | 237 | 237 | 0 | 0 | 0 | 0 | 3 |
[28] † Saltasaurus Last Modified in 12/05/13 | 157 | 177 | 177 | 0 | 0 | 0 | 0 | 3 |
[29] † Isisaurus Last Modified in 12/05/13 | 213 | 121 | 121 | 0 | 0 | 0 | 0 | 3 |
[30] † Losillasaurus Last Modified in 12/05/13 | 269 | 65 | 65 | 0 | 0 | 0 | 0 | 3 |
[31] † Suuwassea Last Modified in 12/05/13 | 213 | 123 | 121 | 0 | 0 | 0 | 0 | 3 |
[32] † SMA 0009 Last Modified in 12/05/13 | 214 | 125 | 120 | 0 | 0 | 0 | 0 | 3 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 43111 | |
Media views | 7189 | Media search (6103 views); M219847 (1086 views); |
Project overview | 4323 | |
Specimen list | 3335 | |
Bibliography | 1339 | |
Documents list | 2178 | |
Matrix views | 3046 | Matrix landing page (2633 views); Data Matrix (413 views); |
Taxon list | 21701 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 336 | |
Media downloads | 4 | M219847 (4 downloads); |
Document downloads | 3 | Copyright Clearance (2 downloads); Data Matrix (1 download); |
Project downloads | 320 | |
Matrix downloads | 9 | Data Matrix (9 downloads); |