Revisiting .

Of the diverse lineages of the Phylum , saprotrophic oomycetes from the salt marsh and mangrove habitats are still understudied, despite their ecological importance. , a monophyletic and monogeneric taxon of the marine and estuarine oomycetes, was introduced to accommodate species with a protruding hyaline apical plug, small hyphal diameter and lack of vesicle formation during zoospore release. At the time of description of , only few species of , an ecologically similar, phylogenetically heterogeneous genus from which was segregated, were included. In this study, a revision of the genus is presented, and five new combinations (, , , , and . ) and one new species () are proposed. Further, the species description of is emended for some exceptional morphological and developmental characteristics. A key to the genus is provided and its generic circumscription and character evolution in cultivable are discussed.