Dissorophoids near the living crown
USNM 489135 记录蛙螈类干群镶嵌性状；不代表冠群、祖先或全球首现。
This is a sampled morphology topology, not an observed ancestor or consensus origin.
claim:taxon:lissamphibia:temnospondyl-hypothesis现生两栖类起源的三条竞争路线
Compare temnospondyl, lepospondyl and stereospondyl-caecilian matrices without turning any sampled topology into a settled ancestor tree.
每一步标明所依据的主张，引用列于下方。交互探索状态可在完整应用中打开；故事本身仍是编辑综合。
故事步骤
A revised matrix changes the shortest tree
Marjanović and Laurin’s corrected and expanded matrix makes the lepospondyl route shorter under their analyses, but bootstrap support is generally low and other matrices disagree.
Parsimony step difference is analysis-specific and is not translated into probability or consensus.
claim:taxon:lissamphibia:lepospondyl-hypothesisCaecilian sampling reverses one proposed route
Funcusvermis 骨床支持无足类总群；孤立骨骼不设定冠群或全球首现。
The conflict is retained as two published results rather than resolved editorially.
claim:taxon:lissamphibia:stereospondyl-caecilian-hypothesis参考文献
- The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondylsSchoch, R.R. · 2019 · DOI 10.1017/jpa.2018.67
- Phylogeny of Paleozoic limbed vertebrates reassessed through revision and expansion of the largest published relevant data matrixMarjanović, D.; Laurin, M. · 2019 · DOI 10.7717/peerj.5565
- Triassic stem caecilian supports dissorophoid origin of living amphibiansKligman, B.T.; Gee, B.M.; Marsh, A.D.; Nesbitt, S.J.; Smith, M.E.; Parker, W.G.; Stocker, M.R. · 2023 · DOI 10.1038/s41586-022-05646-5
- Stem caecilian from the Triassic of Colorado sheds light on the origins of LissamphibiaPardo, J.D.; Small, B.J.; Huttenlocker, A.K. · 2017 · DOI 10.1073/pnas.1706752114