Gonyaulax jurassica var. longicornis Deflandre, 1938

Now Gonyaulacysta jurassica ssp. adecta var. Iongicornis. Originally Gonyaulax jurassica var. Iongicornis, subsequently (and now) Gonyaulacysta jurassica ssp. adecta var. Iongicornis, thirdly Gonyaulacysta jurassica ssp. Iongicornis.
Tax. sr. synonym of Gonyaulacysta jurassica ssp. brevis (Johnson and Hills, 1973) Lentin and Williams, 1975, according to Sarjeant, 1982.

Holotype: Deflandre, 1938, pl.6, fig.6; Jan du Chêne et al., 1986, pl.37, figs.7-8
Age: Oxfordian