Elgorriaga and colleagues infer progressive size reduction and compact strobili along the Equisetaceae plus Neocalamites lineage, with modern-horsetail-like character combinations present by Jurassic times; this is a topology-dependent trend, not a body plan shared by all Equisetopsida. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range372.2–Present Ma
Content packageearly-land-plants
PBDBtxn:54758
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
morphology · medium
Elgorriaga and colleagues infer progressive size reduction and compact strobili along the Equisetaceae plus Neocalamites lineage, with modern-horsetail-like character combinations present by Jurassic times; this is a topology-dependent trend, not a body plan shared by all Equisetopsida.
claim:taxon:equisetopsida:morphologytopology · medium
A combined living-and-fossil character analysis places Equisetum within sampled sphenopsids and reconstructs horsetail transitions; this is a matrix-dependent topology, not an Equisetopsida origin date.
claim:taxon:equisetopsidafossil-range · medium
Equisetopsida is displayed at 372.2–0 Ma only as a Sphenopsida/Equisetopsida Devonian-to-living navigation lineage; it is not a crown-Equisetum origin date, direct-ancestor chain or claim that one species persisted throughout.
claim:taxon:equisetopsida:range-boundary-rc50
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
PBDB mapping requires concept review because the pinned lineage is incompatible with the local expected parent Pteridophyta.