Project 4702: Y. Ke, I. A. Rahman, H. Song, J. Hu, K. Niu, F. Lou, H. Li, F. Han. 2023. A new species of Nanhsiungchelys (Testudines: Cryptodira: Nanhsiungchelyidae) from the Upper Cretaceous of Nanxiong Basin, China. PeerJ. 11:e15439.
Abstract
Nanhsiungchelyidae are a group of large turtles that lived in Asia and North America during the Cretaceous. Here we report a new species of nanhsiungchelyid, Nanhsiungchelys yangi sp. nov., from the Upper Cretaceous of Nanxiong Basin, China. The specimen consists of a well-preserved skull and lower jaw, as well as the anterior parts of the carapace and plastron. The diagnostic features of Nanhsiungchelys include a large entire carapace length (∼55.5 cm), a network of sculptures consisting of pits and ridges on the surface of the skull and shell, shallow cheek emargination and temporal emargination, deep nuchal emargination, and a pair of anterolateral processes on the carapace. However, Nanhsiungchelys yangi differs from the other species of Nanhsiungchelys mainly in having a triangular-shaped snout (in dorsal view) and wide anterolateral processes on the carapace. Additionally, some other characteristics (e.g., the premaxilla is higher than wide, the maxilla is unseen in dorsal views, a small portion of the maxilla extends posterior and ventral of the orbit, and the parietal is bigger than the frontal) are strong evidence to distinguish Nanhsiungchelys yangi from Nanhsiungchelys wuchingensis. A phylogenetic analysis of nanhsiungchelyids places Nanhsiungchelys yangi and Nanhsiungchelys wuchingensis as sister taxa. Nanhsiungchelys yangi and some other nanhsiungchelyids bear distinct anterolateral processes on the carapace, which have not been reported in any extant turtles and may have played a role in protecting the head. The Nanxiong Basin was extremely hot during the Late Cretaceous, and so we suggest that nanhsiungchelyids might have immersed themselves in mud or water to avoid the heat, similar to some extant tortoises. If they were capable of swimming, our computer simulations of fluid flow suggest the anterolateral processes could have reduced drag during locomotion.Read the article »
Article DOI: 10.7717/peerj.15439
Project DOI: 10.7934/P4702, http://dx.doi.org/10.7934/P4702
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 521 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 50 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 106 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:50/0 |
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MorphoBank Project 4702
MorphoBank Project 4702
- Creation Date:
02 June 2023 - Publication Date:
21 June 2023 - Project views: 2494
- Matrix downloads: 1
Authors' Institutions
- Natural History Museum, London
- Xiamen University
- China University of Geosciences
- Oxford University Museum of Natural History
- Yingliang Stone Natural History Museum
- Jiangxi Geological Survey and Exploration Institute
- Guangdong Geological Survey Institute
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
MorphoBank Curator Project Administrator | 4 | 1 | 1 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M29416' (17 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Adocus Last Modified in 08/03/23 | 0 | 51 | 50 | 0 | 0 | 0 | 0 | 1 |
[2] † Zangerlia testudinimorpha Last Modified in 08/03/23 | 28 | 22 | 22 | 0 | 0 | 0 | 0 | 1 |
[3] † Jiangxichelys neimongolensis Last Modified in 08/03/23 | 3 | 47 | 47 | 0 | 0 | 0 | 0 | 1 |
[4] † Zangerlia ukhaachelys Last Modified in 08/03/23 | 29 | 21 | 21 | 0 | 0 | 0 | 0 | 1 |
[5] † Basilemys variolosa Last Modified in 08/03/23 | 4 | 47 | 46 | 0 | 0 | 0 | 0 | 1 |
[6] † Basilemys nobilis Last Modified in 08/03/23 | 15 | 35 | 35 | 0 | 0 | 0 | 0 | 1 |
[7] † Basilemys sinuosa Last Modified in 08/03/23 | 17 | 34 | 33 | 0 | 0 | 0 | 0 | 1 |
[8] † Basilemys praeclara Last Modified in 08/03/23 | 27 | 23 | 23 | 0 | 0 | 0 | 0 | 1 |
[9] † Hanbogdemys orientalis Last Modified in 08/03/23 | 12 | 38 | 38 | 0 | 0 | 0 | 0 | 1 |
[10] † Anomalochelys angulata Last Modified in 08/03/23 | 29 | 21 | 21 | 0 | 0 | 0 | 0 | 1 |
[11] † Nanhsiungchelys wuchingensis Last Modified in 08/03/23 | 15 | 35 | 35 | 0 | 0 | 0 | 0 | 1 |
[12] † Kharakhutulia kalandadzei Last Modified in 08/03/23 | 24 | 26 | 26 | 0 | 0 | 0 | 0 | 1 |
[13] † Jiangxichelys ganzhouensis Last Modified in 08/03/23 | 13 | 37 | 37 | 0 | 0 | 0 | 0 | 1 |
[14] † Zangerlia dzamynchondi Last Modified in 08/03/23 | 25 | 25 | 25 | 0 | 0 | 0 | 0 | 1 |
[15] † Nanhsiungchelys yangi Last Modified in 08/03/23 | 37 | 13 | 13 | 0 | 0 | 0 | 0 | 1 |
[16] † Basilemys morrinensis Last Modified in 08/03/23 | 19 | 31 | 31 | 0 | 0 | 0 | 0 | 1 |
[17] † Yuchelys nanyangensis Last Modified in 08/03/23 | 35 | 15 | 15 | 0 | 0 | 0 | 0 | 1 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 2494 | |
Media views | 587 | Media search (492 views); M863210 (95 views); |
Documents list | 147 | |
Project overview | 223 | |
Bibliography | 107 | |
Views for media list | 179 | |
Specimen list | 291 | |
Taxon list | 821 | |
Matrix views | 139 | Matrix landing page (131 views); Data matrix from supplemental material (8 views); |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 3 | |
Document downloads | 2 | Matrix (2 downloads); |
Matrix downloads | 1 | Data matrix from supplemental material (1 download); |