Plate P3. 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. Chichaouadinium vestitum (Brideaux 1971) Bujak and Davies 1983. Dorsal view. Holotype dimensions: overall length = 71 µm, overall width = 51 µm. 2. Chiropteridium galea (Maier 1959) Sarjeant 1983. Ventral view. Holotype dimensions: central body height = 55 µm, central body width = 76 µm, overall width = 100 µm. 3. Conosphaeridium striatoconum (Deflandre and Cookson 1955) Cookson and Eisenack 1969. Oblique apical view. Range of type material: central body diameter = 52–57 µm, process length = 12–18 µm. 4. Cordosphaeridium cantharellus (Brosius 1963) Gocht 1969. Dorsal view. Holotype dimensions: central body diameter = 54 µm. 5. Cordosphaeridium funiculatum Morgenroth 1966a. Dorsal view. Holotype dimensions: central body diameter = 57 µm. 6. Corrudinium harlandii Matsuoka 1983b. Ventral view. Holotype dimensions: length = 46 µm, width 42 µm, height of septum up to 4 µm. 7. Corrudinium incompositum (Drugg 1970b) Stover and Evitt 1978. Ventral view. Holotype dimensions: length = 40 µm, width 40 µm. 8. Cyclapophysis monmouthensis Benson 1976. Dorsal view. Holotype dimensions: overall width = 135 µm, central body length = 75 µm, central body width = 65 µm. 9–11. Cousteaudinium aubryae de Verteuil and Norris 1996a. All apical view. Holotype dimensions: endocyst length = 49 µm, endocyst width = 38 µm, process length = 6–32 µm. 12. Cyclonephelium filoreticulatum (Slimani 1994) Prince et al. 1999. Ventral view. Holotype dimensions: overall length = 80 µm, overall width = 100 µm, endocyst length = 58 µm, endocyst width = 60 µm. 13. Cyclonephelium membraniphorum Cookson and Eisenack 1962b. Ventral view. Holotype dimensions: overall length = 127 µm, overall breadth = 108 µm, membrane height = 6–22 µm. 14. Damassadinium californicum (Drugg 1967) Fensome et al. 1993b. Ventral view. Range of type material: length = 61–103 µm, width = 44–66 µm. 15. Deflandrea antarctica Wilson 1967a. Dorsal view. Holotype dimensions: pericyst length = 138 µm, pericyst width = 72 µm, endocyst diameter = 69 µm. 16. Deflandrea convexa Wilson 1988. Dorsal view. Holotype dimensions: pericyst length = 93 µm, pericyst width = 76 µm, endocyst length = 76 µm, endocyst width = 76 µm. 17. Deflandrea cygniformis Pöthe de Baldis 1966. Dorsal view. Holotype dimensions: overall length = 195.8 µm, overall width = 99 µm, epicyst length = 145 µm, hypocyst length = 50 µm, endocyst length = 85.8 µm, endocyst width = 102 µm (as stated by Pöthe de Baldis,1966, p. 221). 18. Deflandrea oebisfeldensis Alberti 1959b. Dorsal view. Holotype dimensions: pericyst length = 150 µm, pericyst width = 88 µm. 19. Deflandrea phosphoritica Eisenack 1938b. Dorsal view. Holotype dimensions: pericyst length = 116 µm. 20. Dinogymnium sp. Lateral view. Dimension of holotype of type species, Dinogymnium acuminatum: length = 91 µm, width = 61 µm.

Plate P3. 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. Chichaouadinium vestitum (Brideaux 1971) Bujak and Davies 1983. Dorsal view. Holotype dimensions: overall length = 71 µm, overall width = 51 µm. 2. Chiropteridium galea (Maier 1959) Sarjeant 1983. Ventral view. Holotype dimensions: central body height = 55 µm, central body width = 76 µm, overall width = 100 µm. 3. Conosphaeridium striatoconum (Deflandre and Cookson 1955) Cookson and Eisenack 1969. Oblique apical view. Range of type material: central body diameter = 52–57 µm, process length = 12–18 µm. 4. Cordosphaeridium cantharellus (Brosius 1963) Gocht 1969. Dorsal view. Holotype dimensions: central body diameter = 54 µm. 5. Cordosphaeridium funiculatum Morgenroth 1966a. Dorsal view. Holotype dimensions: central body diameter = 57 µm. 6. Corrudinium harlandii Matsuoka 1983b. Ventral view. Holotype dimensions: length = 46 µm, width 42 µm, height of septum up to 4 µm. 7. Corrudinium incompositum (Drugg 1970b) Stover and Evitt 1978. Ventral view. Holotype dimensions: length = 40 µm, width 40 µm. 8. Cyclapophysis monmouthensis Benson 1976. Dorsal view. Holotype dimensions: overall width = 135 µm, central body length = 75 µm, central body width = 65 µm. 9–11. Cousteaudinium aubryae de Verteuil and Norris 1996a. All apical view. Holotype dimensions: endocyst length = 49 µm, endocyst width = 38 µm, process length = 6–32 µm. 12. Cyclonephelium filoreticulatum (Slimani 1994) Prince et al. 1999. Ventral view. Holotype dimensions: overall length = 80 µm, overall width = 100 µm, endocyst length = 58 µm, endocyst width = 60 µm. 13. Cyclonephelium membraniphorum Cookson and Eisenack 1962b. Ventral view. Holotype dimensions: overall length = 127 µm, overall breadth = 108 µm, membrane height = 6–22 µm. 14. Damassadinium californicum (Drugg 1967) Fensome et al. 1993b. Ventral view. Range of type material: length = 61–103 µm, width = 44–66 µm. 15. Deflandrea antarctica Wilson 1967a. Dorsal view. Holotype dimensions: pericyst length = 138 µm, pericyst width = 72 µm, endocyst diameter = 69 µm. 16. Deflandrea convexa Wilson 1988. Dorsal view. Holotype dimensions: pericyst length = 93 µm, pericyst width = 76 µm, endocyst length = 76 µm, endocyst width = 76 µm. 17. Deflandrea cygniformis Pöthe de Baldis 1966. Dorsal view. Holotype dimensions: overall length = 195.8 µm, overall width = 99 µm, epicyst length = 145 µm, hypocyst length = 50 µm, endocyst length = 85.8 µm, endocyst width = 102 µm (as stated by Pöthe de Baldis,1966, p. 221). 18. Deflandrea oebisfeldensis Alberti 1959b. Dorsal view. Holotype dimensions: pericyst length = 150 µm, pericyst width = 88 µm. 19. Deflandrea phosphoritica Eisenack 1938b. Dorsal view. Holotype dimensions: pericyst length = 116 µm. 20. Dinogymnium sp. Lateral view. Dimension of holotype of type species, Dinogymnium acuminatum: length = 91 µm, width = 61 µm.