Sykidion is a genus of green algae. Pseudoneochloris is a synonym of this genus. , Sykidion was the only genus in the family Sykidiacaeae, which was the only family in the order Sykidiales.
Species , AlgaeBase accepted the following species: Sykidion droebakense Wille Sykidion dyeri E.P.Wright Sykidion gomphonematis K.I.Meyer Sykidion marinum (Shin Watanabe & al.) Darienko & al., syn. Pseudoneochloris marina Sykidion praecipitans (Tschermak-Woess) Komárek
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