Hystrichogonyaulax cladophora ssp. extensa (Klement, 1960) Stover and Evitt, 1978

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.
Brenner, 1988, stated that Hystrichogonyaulax (as Rhynchodiniopsis) cladophora ssp. extensa is a jr. synonyrn of Hystrichogonyaulax (as Rhynchodiniopsis) cladophora (Deflandre, 1938) Stover and Evitt, 1978. Lentin and Williams, 1993, presumed that he intended to imply that the subspecies is a tax. jr. synonym of the autonym Hystrichogonyaulax (as Rhynchodiniopsis) cladophora ssp. cladophora. However, pending clarification of this point, they retained the subspecies Hystrichogonyaulax (as Rhynchodiniopsis) cladophora ssp. extensa as a separate taxon.
Holotype: Klement, 1960, pl.4, figs.1-3; Jan du Chêne et al., 1986, pl.95, figs.4-5.
Age: Early Kimmeridgian