Hystrichodinium amphiacanthum
From dinoflaj3
"?amphiacanthum" Cookson and Eisenack, 1958, p.37, pl.5, fig.9. Holotype: Cookson and Eisenack, 1958, pl.5, fig.9; Fensome et al., 1993a, fig.1 — p.911. NOW Omatidium. Originally Hystrichodinium, subsequently Hystrichodinium?, thirdly (and now) Omatidium. Questionable assignment: Stover and Evitt (1978, p.161–162). Age: Late Jurassic or Neocomian.
Parent: Hystrichodinium