A systematic synthesis recognizes Hexacorallia within Anthozoa while reviewing competing internal relationships and uneven diversity knowledge; it supplies a classification framework, not a precise origin date.
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References / paperThe phylum Cnidaria: a review of phylogenetic patterns and diversity 300 years after Linnaeus
Daly, M.; Brugler, M.R.; Cartwright, P.; et al.
Year2007
Source rolesystematic-review
DOI / ID10.11646/zootaxa.1668.1.11
Fitness and scope
taxonomy · topology · morphology
Broad systematic synthesis of cnidarian diversity and competing phylogenies; unresolved nodes are retained rather than converted into exact origins.
Claim ledger
Hexacorallia has no supported scalar crown range in the cited evidence: the classification review does not justify transferring a 425 Ma Paleozoic coral occurrence to crown Hexacorallia, so the former 425–0 Ma display is withheld.
claim:taxon:hexacorallia:range-boundary-rc50