Ichthyostega is bounded here by specimens from Famennian Upper Devonian deposits of East Greenland used in the cited mobility study; this bounded sample context is not a global distribution or exact complete range.
claim:taxon:ichthyostegaIchthyostega
A Devonian tetrapod whose three-dimensional limb reconstruction provides a bounded test of joint mobility and the mechanical requirements of a typical lateral-sequence walk.
Represented range372.15–358.86 Ma
Content packagetetrapod-transition
PBDBtxn:36965
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
The Ichthyostega mobility study analyses the genus as an early tetrapod and tests its limb mechanics against living analogues; the mechanical result is not a complete phylogenetic hypothesis.
claim:taxon:ichthyostega:taxonomyThe Ichthyostega specimens reconstructed in the cited study are from East Greenland Upper Devonian deposits; this named sample does not establish a global range.
claim:taxon:ichthyostega:biogeographyThree-dimensional reconstruction of Ichthyostega limb joints found no long-axis rotations required for a typical lateral-sequence walk in the tested model, while retaining the possibility that this is a specialization of Ichthyostega.
claim:taxon:ichthyostega:morphologyThe cited Ichthyostega mobility study constrains modeled limb motion but does not directly establish diet, habitat preference or observed locomotor behaviour for the genus.
claim:taxon:ichthyostega:ecologyKnown limits
- A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
References
- Three-dimensional limb joint mobility in the early tetrapod IchthyostegaPierce, S.E.; Clack, J.A.; Hutchinson, J.R. · 2012 · DOI 10.1038/nature11124
- 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