Plate P4. 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. Dinopterygium cladoides Deflandre 1935. Ventral view. Range of type material: overall length = 65 Ám, overall width = 75 Ám, length (minus septa) = 40 Ám, width (minus septa) = 50 Ám. 2. Diphyes colligerum (Deflandre and Cookson 1955) Cookson 1965a. Ventral view. Holotype dimensions: central body diameter = 33 Ám. 3. Diphyes ficusoides Islam 1983b. Ventral view. Holotype dimensions: central body diameter (without processes) = 28 Ám x 36 Ám, process length = 15–17 Ám, antapical process length = 21 Ám, antapical process maximum width = 20 Ám. 4. Distatodinium apenninicum Brinkhuis et al. 1992. Ventral view. Holotype dimensions: central body length = 52 Ám, central body width = 29 Ám, process length = 12 Ám. 5. Distatodinium biffii Brinkhuis et al. 1992. Ventral view. Holotype dimensions: central body length = 95 Ám, central body width = 52 Ám, process length = 45–55 Ám. 6. Dracodinium condylos (Williams and Downie 1966b) Costa and Downie 1979. Dorsal view. Holotype dimensions: pericyst length = 103 Ám, pericyst width = 112.5 Ám. 7. Dracodinium politum Bujak et al. 1980. Dorsal view. Range of type material: pericyst length = 130–150 Ám, pericyst width = 140–168 Ám, endocyst length = 66–80 Ám, endocyst width = 69–76 Ám. 8. Dracodinium varielongitudum (Williams and Downie 1966b) Costa and Downie 1979. Dorsal view. Holotype dimensions: pericyst length = 103 Ám, pericyst width = 100 Ám, endocyst length = 73 Ám, endocyst width = 71 Ám. 9. Dracodinium waipawaense (Wilson 1967c) Costa and Downie 1979. Dorsal view. Holotype dimensions: pericyst length = 102 Ám, pericyst width = 118 Ám, endocyst length = 69 Ám, endocyst width = 69 Ám, apical horn length = 14 Ám, right antapical horn length = 11 Ám, lateral horn length = 22 Ám. 10. Eatonicysta furensis (Heilmann-Clausen in Heilmann-Clausen and Costa 1989) Stover and Williams 1995. Apical view. Holotype dimensions: overall length = 62 Ám, overall width = 60 Ám, central body length = 40 Ám, central body width = 43 Ám. 11. Eatonicysta pterococcoides (O. Wetzel 1933b) Sarjeant 1985b. Lateral view. Range of type material: overall size = 64–68 Ám, central body diameter = 32–40 Ám. 12. Eatonicysta ursulae (Morgenroth 1966a) Stover and Evitt 1978. Apical view. Holotype dimensions: central body diameter = 50 Ám. 13, 14. Ectosphaeropsis burdigalensis Londeix and Jan du Chŕne 1988. Both right lateral view. Holotype dimensions: overall length = 112 Ám, overall diameter = 64 Ám, endocyst length = 52 Ám, endocyst diameter = 39 Ám, process length (excluding apical) = 22–25 Ám, apical process length = 41 Ám, apical protuberence height = 2.5 Ám. 15. Edwardsiella sexispinosa Versteegh and Zevenboom in Versteegh 1995. Dorsal view. Holotype dimensions: length = 55 Ám, maximum diameter = 55 Ám, process length = 39 Ám, apical horn length = 11 Ám, antapical horn length = 16 Ám, membrane height on upper half of process = 5 Ám. 16. Ellipsodinium rugulosum Clarke and Verdier 1967. Oblique right lateral view. Holotype dimensions: length = 40 Ám, breadth = 39 Ám, ridge height = 1.5 Ám. 17. Endoscrinium campanula (Gocht 1959) Vozzhennikova 1967. Dorsal view. Holotype dimensions: overall length = 104 Ám, overall width = 91 Ám. 18. Enneadocysta partridgei Stover and Williams 1995. Ventral view. Range of type material: overall length without opercula = 44–58 Ám (specimens with opercula are 15–20 Ám longer), overall width = 88–128 Ám, process length = 18–32 Ám. 19. Enneadocysta pectiniformis (Gerlach 1961) Stover and Williams 1995. Ventral view. Holotype dimensions: diameter = 32 Ám, process length = 13 Ám. 20. Epelidosphaeridia spinosa Cookson and Hughes 1964 ex Davey 1969a. Dorsal view. Holotype dimensions: overall length = 55 Ám, overall width = 46 Ám.