Rhynchodiniopsis hyaloderma

"?hyaloderma" (Deflandre, 1939b, p.144, pl.6, figs.3–4 ex Sarjeant, 1967b, p.252) Sarjeant, 1982b, p.36.  Holotype: Deflandre, 1939b, pl.6, figs.3–4; Jan du Chêne et al., 1986a, pl.58, figs.1–5.  NOW Impagidinium?.  Originally Palaeoperidinium (name not validly published), subsequently Gonyaulacysta, thirdly Gonyaulacysta?, fourthly Rhynchodiniopsis?, fifthly (and now) Impagidinium?.  Questionable assignment: Sarjeant (1982b, p.36).  Age: Kimmeridgian.

Parent: Rhynchodiniopsis