Knowledge of the interesting phylum of Planctomycetes has increased in the last decades both due to cultural and molecular methods. Although a restricted number of species have been described to date, this group presents a much larger diversity that has been mainly revealed by molecular ecology studies. Isolation experiments allowed us to get a number of new Planctomycetes taxa that extend the already described ones. In this work we present the ultrastructural morphological characterization of these new taxa as well as we give new details of Aquisphaera giovannonii ultrastructure. Furthermore, our interpretation on Planctomycetes cell envelope is provided.