Hystrichogonyaulax cladophora subsp. extensa

"subsp. extensa" (Klement, 1960, p.36-37, pl.4, figs.1-4; text-fig.16) Stover and Evitt, 1978, p.162.  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 this subspecies as a taxonomic junior synonym of Rhynchodiniopsis cladophora - however, Lentin and Williams (1993, p.566) retained Hystrichogonyaulax (as Rhynchodiniopsis) extensa.  Age: Early Kimmeridgian.

Parent: Hystrichogonyaulax cladophora