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

Anchicodiaceae family accepted

Pseudobryopsidaceae family accepted

Poncetellina Mamet & A.Roux, 1984 genus doubtful

Earltonella LoDuca, 2022 genus doubtful

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

Protohalimedaceae family accepted

Pseudoudoteaceae family accepted

Rhipiliaceae 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

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

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

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

Rotella V.P.Shuysky, 1987 genus accepted

Bryopsidaceae family accepted

Chaetosiphonaceae family accepted

Codiaceae family accepted

Derbesiaceae family accepted

Halimedaceae family accepted

Ostreobiaceae family accepted

Pseudocodiaceae family accepted

Pseudoudotaceae family synonym

Courvoisiella K.J.Niklas, 1976 genus doubtful

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

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