Gonyaulacysta cladophora subsp. extensa

"subsp. extensa" (Klement, 1960, p.36-37, pl.4, figs.1-4; text-fig.16) Lentin and Williams, 1973, p.60.  Holotype: Klement, 1960, pl.4, figs.1-3; Jan du Chêne et al., 1986a, pl.95, figs.4-5.  NOW Rhynchodiniopsis cladophora subsp. extensa.  Originally Gonyaulax cladophora subsp. extensa (Appendix B), subsequently Gonyaulacysta cladophora subsp. extensa, thirdly Hystrichogonyaulax cladophora subsp. extensa, fourthly (and now) Rhynchodiniopsis cladophora subsp. 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.  Age: Early Kimmeridgian. Parent: Gonyaulacysta cladophora