Plate P5. 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. Filisphaera filifera Bujak 1984. Dorsal view. Range of type material: length = 45–60 Ám, width = 45–56 Ám. 2. Florentinia mayii Kirsch 1991. Dorsal view. Holotype dimensions: central body = 32 Ám x 40 Ám, broad processes, length and breadth = 19–23 Ám x 18–21 Ám, slender process length = 11 Ám, spine length = 5 Ám. 3. Galeacysta etrusca Corradini and Biffi 1988. Right lateral view. Holotype dimensions: pericyst diameter = 78 Ám x 80 Ám, endocyst diameter = 52 Ám x 66 Ám. 4. Gerdiocysta conopeum Liengjarern et al. 1980. Dorsal view. Holotype dimensions: central body length (excluding operculum) = 64 Ám, central body width = 73 Ám, process length up to 20 Ám. 5. Glaphyrocysta semitecta (Bujak in Bujak et al. 1980) Lentin and Williams 1981. Ventral view. Range of type material: central body length (without operculum) = 33–52 Ám, central body width = 45–60 Ám, maximum process length = 15–37 Ám, maximum membrane height = 25–46 Ám. 6. Gramocysta verricula (Piasecki 1980) Lund and Lund-Christensen in von Daniels et al. 1990. Dorsal view. Holotype dimensions: length (excluding apical area) = 63 Ám, width = 77 Ám. 7. Habibacysta tectata Head et al. 1989b. Dorsal view. Holotype dimensions: diameter = 33 Ám. 8. Heterosphaeridium difficile (Manum and Cookson 1964) Ioannides 1986. Ventral view. Holotype dimensions: diameter = 91 Ám, process length = 25 Ám. 9, 10. Hemiplacophora semilunifera Cookson and Eisenack 1965a. Holotype dimensions: overall length = 62 Ám, overall width = 57 Ám; (9) ventral view; (10) dorsal view. 11, 12. Heteraulacacysta porosa Bujak in Bujak et al. 1980. Holotype dimensions: overall diameter = 85 Ám x 91 Ám; (11) apical view; (12) antapical view.13. Homotryblium floripes (Deflandre and Cookson 1955) Stover 1975. Antapical view. Range of type material: central body diameter = 45–72 Ám x 32–59 Ám, process length = 20–46 Ám, process width = 3–28 Ám. 14, 15. Homotryblium tenuispinosum Davey and Williams 1966b. Holotype dimensions: central body diameter = 41 Ám x 48 Ám; (14) oblique ventral view; (15) oblique dorsal view. 16. "Hystrichokolpoma pseudooceanicum" Zevenboom and Santarelli in Zevenboom 1995 (considered an unpublished manuscript name by the originating authors). Lateral view. Range of type material: central body length = 25–35 Ám, central body width = 30–33 Ám, process length = 12–15 Ám. 17, 18. Hystrichokolpoma bulbosum (Ehrenberg 1838) Morgenroth 1968. Dimensions of specimens examined by Morgenroth (1968): maximum body length = 31–43 Ám, maximum body width = 25–33 Ám, process length = 6–31 Ám; (17) ventral view; (18) dorsal view. 19, 20. Hystrichokolpoma cinctum Klumpp 1953. Holotype dimensions: central body diameter = 46 Ám; (19) ventral view; (20) dorsal view.