Project 4000: J. Li, Z. Sun, G. Cuny, C. Ji, D. Jiang, M. Zhou, L. Cavin. 2021. An unusual shark assemblage from the Ladinian–Carnian interval of South China. Papers in Palaeontology. epub ahead of print:none yet.

Specimen: † Keichouodus nimaiguensis (Lijiachun, 2021) (GMPKU/P:3517)
View: GMPKU-P-3517
View: GMPKU-P-3517
Abstract
A detailed taxonomic study of a diverse chondrichthyan fauna from the Ladinian-Carnian (Middle-Late Triassic) interval at Nimaigu locality in Guizhou Province, South China is presented. Six taxa are described, two of which are assigned to Elasmobranchii incertae sedis (aff. Rosaodus sp., Rosaodus xingyiensis gen. et sp. nov.), three to the Euselachii (Euselachii gen. et sp. indet., Favusodus orientalis gen. et sp. nov., Keichouodus nimaiguensis gen. et sp. nov.) and the last one representing a possible Holocephali (aff. Arctacanthus sp.). Their stratigraphic distribution is documented on a bed-by-bed basis. This fauna is unusual because it is dominated by sharks with a cladodont-like dentition, which were barely known after the end-Permian mass extinction, and almost devoid of durophagous euselachians, which make it different from all other contemporaneous shark faunas worldwide. Transitional features are documented between “cladodont” teeth and those of neoselachian sharks, which provide new insights on the replacement pattern of “ancient” sharks by “modern” ones.Read the article »
Article DOI: 10.1002/spp2.1404
Project DOI: 10.7934/P4000, http://dx.doi.org/10.7934/P4000
This project contains | Matrices |
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Download Project SDD File ![]() | Total scored cells: 192 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 24 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 51 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:24/0 |
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MorphoBank Project 4000
MorphoBank Project 4000
- Creation Date:
12 May 2021 - Publication Date:
09 October 2021 - Project views: 14635
- Matrix downloads: 7
Authors' Institutions
- Beijing University (Peking University)
- Chinese Academy of Sciences
- University Claude Bernard Lyon
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences
- Shandong University of Science and Technology
Members
member name | taxa ![]() |
specimens ![]() |
media ![]() | media notes | chars ![]() | character
| cell scorings (scored, NPA, "-") | cell
| rules ![]() | ||||||||||||||
Jiachun Li Project Administrator | 15 | 47 | 1 | 0 | 24 | 0 | 24 | 0 | 0 | 192 (192, 0, 0) | 0 | 0 | 0 | 0 | 0 | ||||||||
Gilles Cuny Observer ![]() | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | 0 | 0 | ||||||||
Cheng Ji Observer ![]() | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | 0 | 0 | ||||||||
Zuoyu Sun | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M27419' (8 Taxa)
taxon | unscored cells |
scored cells ![]() |
no cell support ![]() |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Leonodus Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
[2] † Cladodoides Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
[3] † Rosaodus Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
[4] † Euselachii indet. Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
[5] † Hybodus Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
[6] † Favusodus Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
[7] † Keichouodus Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
[8] † Synechodus Last Modified in 09/22/21 | 0 | 24 | 24 | 0 | 0 | 0 | 0 | 4 ![]() |
Project views 
type | number of views | Individual items viewed (where applicable) |
Total project views | 14635 | |
Project overview | 676 | |
Media views | 1441 | Media search (1224 views); M740267 (217 views); |
Documents list | 392 | |
Matrix views | 387 | Matrix landing page (357 views); An unusual shark assemblage from the Ladinian/Carnian interval of South China (30 views); |
Taxon list | 2275 | |
Bibliography | 309 | |
Views for media list | 420 | |
Specimen list | 8735 |
Project downloads 
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 41 | |
Project downloads | 24 | |
Document downloads | 10 | Appendix S1 (3 downloads); Appendix S2 (2 downloads); Appendix S3 (3 downloads); Appendix S4 (2 downloads); |
Matrix downloads | 7 | An unusual shark assemblage from the Ladinian/Carnian interval of South China (7 downloads); |