| Title |
A New Paleozoic Symmoriiformes (Chondrichthyes) from the Late Carboniferous of Kansas (USA) and Cladistic Analysis of Early Chondrichthyans
|
|---|---|
| Published in |
PLOS ONE, September 2011
|
| DOI | 10.1371/journal.pone.0024938 |
| Pubmed ID | |
| Authors |
Alan Pradel, Paul Tafforeau, John G. Maisey, Philippe Janvier |
| Abstract |
The relationships of cartilaginous fishes are discussed in the light of well preserved three-dimensional Paleozoic specimens. There is no consensus to date on the interrelationship of Paleozoic chondrichthyans, although three main phylogenetic hypotheses exist in the current literature: 1. the Paleozoic shark-like chondrichthyans, such as the Symmoriiformes, are grouped along with the modern sharks (neoselachians) into a clade which is sister group of holocephalans; 2. the Symmoriiformes are related to holocephalans, whereas the other Paleozoic shark-like chondrichthyans are related to neoselachians; 3. many Paleozoic shark-like chondrichthyans, such as the Symmoriiformes, are stem chondrichthyans, whereas stem and crown holocephalans are sister group to the stem and crown neoselachians in a crown-chondrichthyan clade. This third hypothesis was proposed recently, based mainly on dental characters. |
Mendeley readers
The data shown below were compiled from readership statistics for 58 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 2 | 3% |
| Colombia | 1 | 2% |
| Indonesia | 1 | 2% |
| Germany | 1 | 2% |
| France | 1 | 2% |
| United States | 1 | 2% |
| Unknown | 51 | 88% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 13 | 22% |
| Student > Ph. D. Student | 12 | 21% |
| Student > Bachelor | 12 | 21% |
| Professor | 3 | 5% |
| Student > Doctoral Student | 2 | 3% |
| Other | 6 | 10% |
| Unknown | 10 | 17% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 22 | 38% |
| Earth and Planetary Sciences | 16 | 28% |
| Medicine and Dentistry | 4 | 7% |
| Biochemistry, Genetics and Molecular Biology | 2 | 3% |
| Environmental Science | 2 | 3% |
| Other | 1 | 2% |
| Unknown | 11 | 19% |