Lithodinia borealis
From dinoflaj3
"borealis" (Sarjeant, 1980b, p.123–124) Riley and Fenton, 1982, p.200. Holotype: Sarjeant, 1972, pl.5, fig.3; text-fig.5 [as Meiourogonyaulax decapitata (Wetzel, 1967a) Sarjeant, 1972]. NOW Meiourogonyaulax. Originally (and now) Meiourogonyaulax, subsequently Lithodinia. Taxonomic junior synonym: Lithodinia arktika, according to Riley and Fenton (1982, p.200) and Lentin and Williams (1989, p.228). Age: late Bathonian.
Parent: Lithodinia