Hystrichodinium amphiacanthum

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"?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