28S and 18S rDNA from living lampreys and hagfishes support cyclostome monophyly in the sampled analyses. Extant sequence topology does not set the cyclostome fossil first appearance, divergence date or direct ancestry.
claim:taxon:cyclostomataCyclostomata
28S and 18S rDNA from living lampreys and hagfishes support cyclostome monophyly in the sampled analyses. Extant sequence topology does not set the cyclostome fossil first appearance, divergence date or direct ancestry. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range358–Present Ma
Content packageearly-fishes
PBDBNot linked
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
Undoubted lampreys are reviewed from about 358 Ma and cyclostomes survive as living lamprey and hagfish lineages, supporting a 358 Ma–present evidence-route window rather than a precise crown origin.
claim:taxon:cyclostomata:range-boundaryKnown limits
- A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
- PBDB external identifier withheld: accepted-rank-mismatch.
- PBDB mapping requires concept review because the pinned lineage is incompatible with the local expected parent Agnatha.
References
- Early jawless vertebrates and cyclostome originsJanvier, P. · 2008 · DOI 10.2108/zsj.25.1045
- Open Tree of Life web servicesOpenTreeOfLife Project
- The Paleobiology Database application programming interfacePeters, S.E.; McClennen, M. · 2016 · DOI 10.1017/pab.2015.39
- 28S and 18S rDNA sequences support the monophyly of lampreys and hagfishesMallatt, J.; Sullivan, J. · 1998 · DOI 10.1093/oxfordjournals.molbev.a025897