Sykidion

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