Plate P9. The modified Kofoid system (as outlined in Fensome et al., 1993b) is used in the labeling of individual plates for the gonyaulacaleans. The Kofoid system is used in the labeling of plates in the peridinialeans. The archeopyle location is denoted by diagonal lines. 1. Selenopemphix armata Bujak in Bujak et al., 1980. Apical view. Range of type material: autocyst thickness (excluding processes) = 26–43 Ám, autocyst width (excluding processes) = 24–45 Ám, process length = 9–17 Ám. 2. Selenopemphix dionaeacysta Head et al. 1989b. Apical view. Holotype dimensions: maximum length (excluding processes) = 38 Ám, process length (based on 17 specimens) = 4–8 Ám. 3. Senoniasphaera inornata (Drugg 1970b) Stover and Evitt 1978. Ventral view. Holotype dimensions: overall length (with operculum) = 118 Ám, overall width = 100 Ám. 4. Senoniasphaera protrusa Clarke and Verdier 1967. Ventral view. Holotype dimensions: overall length = 100 Ám, overall width = 71 Ám, endocyst length = 66 Ám, endocyst width = 60 Ám, apical horn length = 18 Ám, antapical horn length = 12 Ám, cingulum width = 6–7 Ám. 5, 6. Senoniasphaera rotundata Clarke and Verdier 1967. Ventral view. Holotype dimensions: overall length = 92 Ám, overall width = 67 Ám, endocyst length = 71 Ám, endocyst width = 60 Ám, apical horn length = 14 Ám, antapical horn length = 8 and 2 Ám, cingulum width = 3 Ám. 7. Senoniasphaera rotundata subsp. alveolata Pearce et al. 2003. 8. Spinidinium echinoideum (Cookson and Eisenack 1960a) Lentin and Williams 1976. Ventral view. Holotype dimensions: pericyst length = 80 Ám, pericyst with = 57 Ám, endocyst diameter = 43 Ám. 9. Spinidinium macmurdoense (Wilson 1967a) Lentin and Williams 1976. Dorsal view. Holotype dimensions: pericyst length = 99 Ám, pericyst width = 72 Ám x 63 Ám. 10. Spiniferites porosus (Manum and Cookson 1964) Harland 1973. Showing single plate 4'' and processes. Holotype dimensions: central body diameter = 66 Ám x 75 Ám, process length = 17–23 Ám. 11. Spiniferites ramosus subsp. maeandriformis (Corradini 1973) Lentin and Williams 1975. Showing single plate 4┤'' and processes. Holotype dimensions: central body diameter = 60 Ám x 60 Ám, process length = 18–25 Ám. 12. Spiniferites? velatus (Clarke and Verdier 1967) Stover and Evitt 1978. Ventral view. Holotype dimensions: overall diameter = 100 Ám, central body diameter = 55 Ám, process length plus ledge = maximum of 32 Ám, height of ledges = maximum of 20 Ám. 13. Spongodinium delitiense (Ehrenberg 1838) Deflandre 1936b. Dorsal view. Dimensions of specimens examined by Deflandre (1936b): length = 75–130 Ám, width = 70–112 Ám. 14, 15. Stephodinium coronatum Deflandre 1936a. Holotype dimensions: equatorial diameter of pericyst = 72 Ám, endocyst diameter = 43 Ám x 55 Ám; (14) dorsal view; (15) apical view. 16. Sumatradinium druggii Lentin et al. 1994. Dorsal view. Holotype dimensions: autocyst length = 76 Ám, autocyst width = 70 Ám, process length = up to 15 Ám. 17, 18. Stoveracysta kakanuiensis Clowes 1985. Holotype dimensions: overall length = 70 Ám, length from archeopyle margin to antapex = 49 Ám, overall width = 62 Ám, archeopyle diameter = 46 Ám, cingulum width = 5 Ám; (17) ventral view; (18) oblique dorsal view. 19, 20. Stoveracysta ornata (Cookson and Eisenack 1965a) Clowes 1985. Holotype dimensions: length = 70 Ám, width = 57 Ám; (19) ventral view; (20) dorsal view.