Classification: orders and families
Current classification of the Ulvophyceae includes 32 families in 8 orders (Leliaert et al. 2015). The present study significantly revises the classification of ulvophytes, in particular the Ulvales and Ulotrichales. One order (Chlorocystidales) is resurrected, and eight families are newly described or resurrected. The Ignatius-clade, which has been recognized as a distinct clade of Ulvophyceae based on ultrastructural and molecular data, is here formally described as a new order and family (Ignatiales, Ignatiaceae). An overview of the order and family level classification, as presented in the current treatment, with indication of habitat type (up to the family level) is given in Table 1.
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