Xiushanosteus mirabilis is a placoderm-grade jawed stem gnathostome represented by articulated material; its character mosaic does not establish direct ancestry or resolve historical Placodermi as a natural clade.
claim:taxon:xiushanosteus:taxonomyXiushanosteus
A Telychian jawed stem-gnathostome genus anchored here by the articulated Xiushanosteus mirabilis holotype and multiple referred bodies from the Chongqing Lagerstätte.
Represented range438.6–432.9 Ma
Content packageearly-fishes
PBDBtxn:500054
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
Xiushanosteus is documented from the Huixingshao Formation in Xiushan County, Chongqing, South China; the evidence records that locality rather than a global distribution.
claim:taxon:xiushanosteus:biogeographyThe articulated body supplies depositional and anatomical context, but diet, life habitat, trophic guild and measured swimming performance remain unresolved.
claim:taxon:xiushanosteus:ecologyHolotype IVPP V300001 and referred IVPP V300002–V300021 preserve approximately 30 mm articulated bodies with cranial armour and a mosaic skull-roof character combination.
claim:taxon:xiushanosteus:morphologyThe displayed 438.6–432.9 Ma interval is the Telychian time-scale envelope for the Huixingshao Formation Xiushanosteus sample and is not a global genus range, FAD, LAD or gnathostome origin.
claim:taxon:xiushanosteus:fossil-rangeKnown limits
- A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
References
- The oldest complete jawed vertebrates from the early Silurian of ChinaZhu, Y.; Li, Q.; Lu, J.; Chen, Y.; Wang, J.; Gai, Z.; Zhao, W.; Wei, G.; Yu, Y.; Ahlberg, P.E.; Zhu, M. · 2022 · DOI 10.1038/s41586-022-05136-8
- Open Tree of Life web servicesOpenTreeOfLife Project
- The Paleobiology Database application programming interfacePeters, S.E.; McClennen, M. · 2016 · DOI 10.1017/pab.2015.39
- Denormalized occurrence and taxon tables of the Paleobiology DatabaseThe Paleobiology Database Community; Kocsis, Á.T. · 2026 · DOI 10.5281/zenodo.21620933