Permian woods from Paraná Basin, Brazil: a synthesis and taxonomic validity

The fossil woods identified in the Permian strata of Paraná Basin are revised in its validity, based in the original descriptions and proposed names published. Twenty-eight genera and 52 species are confirmed, most represented by nearly complete preserved materials, and few by its tracheidoxyls. Most of the wood material originates from Irati Formation (Middle Permian), which outcrops are located in São Paulo state, and a smaller amount is found in Rio Bonito (Lower Permian) and Serra Alta (Upper Permian) formations, from Rio Grande do Sul and Santa Catarina states. According to the rules of the ICBN and the new contributions in the fossil wood descriptions, 47 specific names used to the Permian wood remains could be legitimate by its diagnosis and diagramatic representation. Five species (Polysolenoxylon bageense, Scleromedulloxylon batoviense, Aracnomedulloxylon gabrielensis, Myelontordoxylon glandulifera and Polysolenoxylon resiniferum) are rejected in the diagnosis and description of characters presented and deserve a new description due to the unprecedented nature of some of their logs in the basin.