The article presents a comprehensive phylogenetic classification of ray-finned fishes (Actinopterygii) based on a summary phylogeny of 830 lineages, including all recognized actinopterygian families and 287 fossil taxa. The classification is unranked and based on phylogenetic definitions for 90 clade names, with a review of seven previously defined names. Each clade is described with its etymology, species diversity, diagnostic morphological apomorphies, synonyms, and nomenclatural history. The new classification avoids redundant group names and includes only one new name among the 97 clade names reviewed. It is based on the phylogeny of ray-finned fishes that has emerged in the 21st century, incorporating molecular data and phylogenomic studies. The classification is free of redundant names and is based on the phylogeny of ray-finned fishes, which has been significantly influenced by molecular data. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopteryThe article presents a comprehensive phylogenetic classification of ray-finned fishes (Actinopterygii) based on a summary phylogeny of 830 lineages, including all recognized actinopterygian families and 287 fossil taxa. The classification is unranked and based on phylogenetic definitions for 90 clade names, with a review of seven previously defined names. Each clade is described with its etymology, species diversity, diagnostic morphological apomorphies, synonyms, and nomenclatural history. The new classification avoids redundant group names and includes only one new name among the 97 clade names reviewed. It is based on the phylogeny of ray-finned fishes that has emerged in the 21st century, incorporating molecular data and phylogenomic studies. The classification is free of redundant names and is based on the phylogeny of ray-finned fishes, which has been significantly influenced by molecular data. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinopterygian clade. The classification is based on the PhyloCode, which provides a framework for unranked phylogenetic taxonomy. The classification includes a detailed phylogenetic tree and provides a comprehensive list of constituent lineages for each major actinoptery