Gonyaulacysta cladophora ssp. extensa (Klement, 1960) Lentin and Williams, 1973

Now Rhynchodiniopsis cladophora ssp. extensa. Originally Gonyaulax cladophora ssp. extensa, subsequently Gonyaulacysta cladophora ssp. extensa, thirdly Hystrichogonyaulax cladophora ssp. extensa, fourthly (and now) Rhynchodiniopsis cladophora ssp. extensa.
Taxonomic senior synonym: Gonyaulax (as Rhynchodiniopsis) cladophora subsp. cladophora, by implication in Brenner (1988, p.72), who listed the subspecies as a taxonomic junior synonym of the species Rhynchodiniopsis cladophora — however, Lentin and Williams (1993, p.566) retained Gonyaulacysta (as Rhynchodiniopsis) cladophora subsp. extensa.

Holotype: Klement, 1960, pl.4, figs.1-3; Jan du Chêne et al., 1986, pl.95, figs.4-5
Age: Early Kimmeridgian