Project 3544: J. Jia, K. Gao. 2019. A new stem hynobiid salamander (Urodela, Cryptobranchoidea) from the Upper Jurassic (Oxfordian) of Liaoning Province, China. Journal of Vertebrate Paleontology. 39 (2):e1588285.
Specimen: † Linglongtriton (PKUP:V0277)
View: 3D reconstruction

Abstract

Hynobiids are a group of small- to moderate-sized salamanders living primarily in Asia. They are a primitive crown-group clade, with a poor fossil record. Several hynobiid-like taxa have been discovered from the Lower Cretaceous strata of northern China during the last 20 years, with Liaoxitriton zhongjiani and Nuominerpeton aquilonaris identified as the oldest known stem hynobiids. However, the record of pre-Cretaceous hynobiid-like taxa is only known by Liaoxitriton daohugouensis, of which both the morphology and the congeneric status with L. zhongjiani remain problematic. Here, we report on a new hynobiid-like salamander, Linglongtriton daxishanensis, gen. et sp. nov., on the basis of two specimens from the Upper Jurassic Lanqi/Tiaojishan Formation (∼160 Ma) of Liaoning Province, China. Linglongtriton is diagnosed by a unique combination of features revealed by both observation under microscope and micro-computed tomography (μCT) scan of the holotype, including nasals separated from each other at the midline; prootic, opisthotic, and exoccipital retained as discrete elements; dentary with a lateral groove; articular not ossified; metacarpal III enlarged; a single centrale; and distal tarsals 4 and 5 fused into a single element. Phylogenetic analysis identified Linglongtriton and several other hynobiid-like taxa, including Liaoxitriton daohugouensis, as stem hynobiids, thereby extending the temporal range of the stem by at least 40 Ma—from the Early Cretaceous (Aptian–Barremian) to the Middle Jurassic (Bathonian). Comparative study of Linglongtriton with living and fossil hynobiids sheds new lights on the evolution and developmental mechanisms of several characters, including nasal separation and tarsal elements.


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Article DOI: 10.1080/02724634.2019.1588285

Project DOI: 10.7934/P3544, http://dx.doi.org/10.7934/P3544
This project containsMatrices
  • 4 Media
  • 1 Matrix
  • 2 Documents
  • 34 Taxa
  • 2 Specimens
  • 120 Characters
Total size of project's media files: 8 MB

Download Project SDD File
Total scored cells: 3038
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 120
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 262
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:120/0
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MorphoBank Project 3544


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Tanya Berardini
    Project Administrator
    Last logged in 10/18/19
    3404120003038
    (3038, 0, 0)
    000
    Jia Jia
    Full membership
    Last logged in 10/18/19
    0200000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M26266' (34 Taxa)

    taxon unscored
    cells
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    "-" cellscell images labels on
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    member
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    [1] † Karaurus
    Last Modified in 10/03/19
    53676700002
    [2] Cryptobranchus
    Last Modified in 10/03/19
    511811500002
    [3] Andrias
    Last Modified in 10/03/19
    611511400002
    [4] Hynobius
    Last Modified in 10/03/19
    612611400002
    [5] Onychodactylus
    Last Modified in 10/03/19
    611611400002
    [6] Plethodon
    Last Modified in 10/03/19
    1310910700002
    [7] Desmognathus
    Last Modified in 10/03/19
    1710410300002
    [8] Amphiuma
    Last Modified in 10/03/19
    911411100002
    [9] † Proamphiuma
    Last Modified in 10/18/19
    1119900002
    [10] Rhyacotriton
    Last Modified in 10/03/19
    411711600002
    [11] Siren
    Last Modified in 10/03/19
    1310810700002
    [12] Pseudobranchus
    Last Modified in 10/03/19
    1710310300002
    [13] † Habrosaurus
    Last Modified in 10/18/19
    100202000002
    [14] Necturus
    Last Modified in 10/03/19
    1910110100002
    [15] Proteus
    Last Modified in 10/03/19
    2010010000002
    [16] Salamandra
    Last Modified in 10/03/19
    611711400002
    [17] Taricha
    Last Modified in 10/03/19
    711311300002
    [18] Tylototriton
    Last Modified in 10/03/19
    1111010900002
    [19] Dicamptodon
    Last Modified in 10/03/19
    412211600002
    [20] Ambystoma
    Last Modified in 10/03/19
    511811500002
    [21] † Valdotriton
    Last Modified in 10/18/19
    54666600002
    [22] † Jeholotriton
    Last Modified in 10/18/19
    73474700002
    [23] † Liaoxitriton zhongjiani
    Last Modified in 10/18/19
    49717100002
    [24] † Pangerpeton
    Last Modified in 10/18/19
    53676700002
    [25] † Chunerpeton
    Last Modified in 10/18/19
    53676700002
    [26] † Beiyanerpeton
    Last Modified in 10/18/19
    42787800002
    [27] † Iridotriton
    Last Modified in 10/18/19
    97232300002
    [28] † Qinglongtriton
    Last Modified in 10/18/19
    36848400002
    [29] † Linglongtriton
    Last Modified in 10/18/19
    32888800002
    [30] Liua
    Last Modified in 10/03/19
    711511300002
    [31] Pseudohynobius
    Last Modified in 10/03/19
    711511300002
    [32] † Nuominerpeton
    Last Modified in 10/18/19
    31898900002
    [33] † Regalerpeton
    Last Modified in 10/18/19
    44777600002
    [34] † Liaoxitriton daohugouensis
    Last Modified in 10/03/19
    76444400002


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views334
    Project overview56
    Media views57Media search (38 views); M681534 (5 views); M681535 (4 views); M681536 (5 views); M681537 (5 views);
    Matrix views27Matrix landing page (17 views); Linglongtriton 34 taxa 120 character matrix (10 views);
    Documents list16
    Views for media list18
    Specimen list24
    Taxon list108
    Bibliography28




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project3
    Matrix downloads1Linglongtriton 34 taxa 120 character matrix (1 download);
    Project downloads2