Poncetellina Mamet & A.Roux, 1984 genus doubtful

Earltonella LoDuca, 2022 genus doubtful

Walcottophycus M.Y.Wu & LoDuca, 2016 genus doubtful

Smithsoniella J.R.Sears & S.H.Brawley, 1982 genus doubtful

Globosiphonia V.N.Dubatolov & T.A.Moskalenko, 1988 genus doubtful

Rotella V.P.Shuysky, 1987 genus accepted

Rhipiliaceae family accepted

Buthograptus J.Hall, 1861 genus doubtful

Octaviona F.W.Sommer, 1954 genus accepted

Uraloclibeca V.P.Shuysky & D.I.Schirschova, 1988 genus doubtful

Patrunovia Shuysky, 1988 genus doubtful

Lanciculaceae family accepted

Parakamaena B.L.Mamet & A.Roux, 1975 genus doubtful

Spongioporella V.P.Shuysky & D.I.Schirschova, 1988 genus doubtful

Sphaeroporella I.A.Antropov, 1967 genus doubtful

Courovisiella K.J.Niklas, 1976 genus synonym

Cummingsella B.Mamet & A.Roux, 1980 genus doubtful

Aternasusaceae family accepted

Udoteaceae family accepted

Protohalimedaceae family accepted

Inocladus LoDuca, Swinehart, M.A.LeRoy, Tetreault & Steckenfinger, 2020 genus accepted

Anchicodiaceae family accepted

Pseudobryopsidaceae family accepted

Pseudoudoteaceae family accepted

Dichotomosiphonaceae family accepted

Siphonales family synonym

Caulerpaceae family accepted

Dichtomosiphonaceae family synonym

Thalassocystis R.E.Taggart & L.R.Parker, 1976 genus accepted

Globulinea T.Ulke genus accepted

Kamaenella B.L.Mamet & A.Roux, 1975 genus doubtful

Pseudoudotaceae family synonym

Courvoisiella K.J.Niklas, 1976 genus doubtful

Patrunovia V.N.Dubatolov & T.A.Moskalenko, 1988 genus doubtful

Bryopsidaceae family accepted

Chaetosiphonaceae family accepted

Codiaceae family accepted

Derbesiaceae family accepted

Halimedaceae family accepted

Ostreobiaceae family accepted

Pseudocodiaceae family accepted