Phylogenomic integration across 89 sea-spider species and all living families supports a sampled topology for Pycnogonida. The result concerns sampled living relationships and does not directly date the fossil origin or global first appearance of sea spiders. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range500–Present Ma
Content packagetrilobites-chelicerates
PBDBtxn:19015
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
topology · medium
Phylogenomic integration across 89 sea-spider species and all living families supports a sampled topology for Pycnogonida. The result concerns sampled living relationships and does not directly date the fossil origin or global first appearance of sea spiders.
claim:taxon:pycnogonidafossil-range · contested
The 500–0 Ma pycnogonid display is a contested total-group fossil-to-living navigation envelope because Cambropycnogon is only possibly a pycnogonid and is not a secure crown first appearance.
claim:taxon:pycnogonida:fossil-range
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.