ArticleProceedings of the National Academy of Sciences of the United States of America2012
Late Jurassic salamandroid from western Liaoning, China.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 25 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
25 citing papers in PubMed, 94 citations in OpenAlex.
- New fossil evidence from the Late Cretaceous of Europe (southern France) deepens the origin of Salamandridae (Urodela) and refines the biogeography of the family.Scientific reports · 2026Article
- Ancient DNA integrates fossil and modern giant salamander taxonomy.Scientific reports · 2025Article
- Origin and stepwise evolution of vertebrate lungs.Nature ecology & evolution · 2025Article
- Biogeographic history of Palearctic caudates revealed by a critical appraisal of their fossil record quality and spatio-temporal distribution.Royal Society open science · 2022Article
- Middle Jurassic fossils document an early stage in salamander evolution.Proceedings of the National Academy of Sciences of the United States of America · 2022Article
- Pheromone Gene Diversification and the Evolution of Courtship Glands in Plethodontid Salamanders.Journal of molecular evolution · 2021Article
- Middle Jurassic stem hynobiids from China shed light on the evolution of basal salamanders.iScience · 2021Article
- Comparative osteology of the hynobiid complex Liua-Protohynobius-Pseudohynobius (Amphibia, Urodela): Ⅰ. Cranial anatomy of Pseudohynobius.Journal of anatomy · 2021Article
- The Making of Calibration Sausage Exemplified by Recalibrating the Transcriptomic Timetree of Jawed Vertebrates.Frontiers in genetics · 2021Article
- Article
- A Triassic stem-salamander from Kyrgyzstan and the origin of salamanders.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
- Article
- Osteology of Batrachuperus yenyuanensis (Urodela, Hynobiidae), a high-altitude mountain stream salamander from western China.PloS one · 2019Article
- Article
- Osteology ofPeerJ · 2018Article
- Evidence for complex life cycle constraints on salamander body form diversification.Proceedings of the National Academy of Sciences of the United States of America · 2017Article
- Cranial biomechanics in basal urodeles: the Siberian salamander (Salamandrella keyserlingii) and its evolutionary and developmental implications.Scientific reports · 2017Article
- Earliest filter-feeding pterosaur from the Jurassic of China and ecological evolution of Pterodactyloidea.Royal Society open science · 2017Article
- A New Basal Salamandroid (Amphibia, Urodela) from the Late Jurassic of Qinglong, Hebei Province, China.PloS one · 2016Article
- Article
Corrections and comments
- Commented on by
- Erratum issued
Authors and funding
2 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
A Jurassic salamander, Beiyanerpeton jianpingensis (gen. et sp. nov.), from a recently found site in western Liaoning Province, China is the earliest known record of Salamandroidea. As a Late Jurassic record of the group, it extends the range of the clade by ~40 Ma. The Late Jurassic taxon is neotenic and represented by exceptionally preserved specimens, including fully articulated cranial and postcranial skeletons and bony gill structures close to the cheek region. The fossil beds, consisting of dark-brown volcanic ash shales of the Upper Jurassic Tiaojishan (Lanqi) Formation (Oxfordian), underlie trachyandesite rocks that have yielded a SHRIMP zircon U-Pb date of 157 ± 3 Ma. The fossiliferous beds are substantially older than the Jehol Group, including the Yixian Formation ((40)Ar/(39)Ar dates of 122-129 Ma), but slightly younger than the Middle Jurassic Daohugou horizon ((40)Ar/(39)Ar date of 164 ± 4 Ma). The early fossil taxon shares with extant salamandroids derived character states, including: separated nasals lacking a midline contact, angular fused to the prearticular in the lower jaw, and double-headed ribs on the presacral vertebrae. In contrast to extant salamandroids, however, the salamander shows a discrete and tooth-bearing palatine, and unequivocally nonpedicellate and monocuspid marginal teeth in large and presumably mature individuals. The finding provides insights into the evolution of key characters of salamanders, and also provides direct evidence supporting the hypothesis that the split between Cryptobranchoidea and Salamandroidea had taken placed before the Late Jurassic Oxfordian time. In this aspect, both paleontological and molecular data now come to agree.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.