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Pentagonum
From Fensome et al., 2019:
"Pentagonum", Vozzhennikova, 1963, p.183 ex Vozzhennikova, 1967, p.106.
Taxonomic senior synonym: Palaeoperidinium, according to Lentin and Williams (1976, p.161).
This name was not validly published in Vozzhennikova (1963, p.183) since there were no validly published species. This name is not an illegitimate junior homonym of Pentagonium Schauer, 1843 as for example indicated in Fensome and Williams (2004, p.513), as the spelling is not identical. Type: Vozzhennikova, 1967, pl.46, fig.2, as Pentagonum sibiricum (for lectotype see Pentagonum sibiricum) .
"Pentagonum", Vozzhennikova, 1963, p.183 ex Vozzhennikova, 1967, p.106.
Taxonomic senior synonym: Palaeoperidinium, according to Lentin and Williams (1976, p.161).
This name was not validly published in Vozzhennikova (1963, p.183) since there were no validly published species. This name is not an illegitimate junior homonym of Pentagonium Schauer, 1843 as for example indicated in Fensome and Williams (2004, p.513), as the spelling is not identical. Type: Vozzhennikova, 1967, pl.46, fig.2, as Pentagonum sibiricum (for lectotype see Pentagonum sibiricum) .