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Scriniodinium ceratophorum
Scriniodinium "?ceratophorum" Cookson and Eisenack, 1960b, p.249, pl.37, fig.7. Emendation: Riding, 2005a, p.14,16,18, as Gonyaulacysta ceratophora.
NOW Gonyaulacysta. Originally Scriniodinium, subsequently Scriniodinium?, thirdly (and now) Gonyaulacysta. Questionable assignment: Stover and Evitt (1978, p.187).
Taxonomic junior synonym: Psaligonyaulax australica, according to Jan du Chêne et al. (1986a, p.266) — however, Psaligonyaulax australica is now considered a taxonomic junior synonym of Psaligonyaulax (as Gonyaulacysta) dualis.
Holotype: Cookson and Eisenack, 1960b, pl.37, fig.7; Jan du Chêne et al., 1986a, pl.112, fig.1; Helby et al., 1987, fig.18C; Riding, 2005a, text-figs.2A–B.
Age: Oxfordian–early Kimmeridgian.
Original description: Cookson and Eisenack, 1960, p. 249.
Description: Shell flat, consisting of a larger triangular epitheca and a smaller rounded hypotheca which are separated by an apparently broad girdle with thin borders. Shell-membrane thin, either smooth or, as in the type, finely granular, prolonged into a well-developed apical horn having a truncate apex with a small median projection. The capsule has a small apical prominence and almost fills the shell. A large pylome is developed in the vicinity of the girdle.
Dimensions: Holotype: 125 µm long, 94 µm broad, capsule 97 x 96 µm, horn 24 µm. Another specimen: 110 µm long, 71 µm broad, capsule 70 x 67 µm, horn 33 µm.
NOW Gonyaulacysta. Originally Scriniodinium, subsequently Scriniodinium?, thirdly (and now) Gonyaulacysta. Questionable assignment: Stover and Evitt (1978, p.187).
Taxonomic junior synonym: Psaligonyaulax australica, according to Jan du Chêne et al. (1986a, p.266) — however, Psaligonyaulax australica is now considered a taxonomic junior synonym of Psaligonyaulax (as Gonyaulacysta) dualis.
Holotype: Cookson and Eisenack, 1960b, pl.37, fig.7; Jan du Chêne et al., 1986a, pl.112, fig.1; Helby et al., 1987, fig.18C; Riding, 2005a, text-figs.2A–B.
Age: Oxfordian–early Kimmeridgian.
Original description: Cookson and Eisenack, 1960, p. 249.
Description: Shell flat, consisting of a larger triangular epitheca and a smaller rounded hypotheca which are separated by an apparently broad girdle with thin borders. Shell-membrane thin, either smooth or, as in the type, finely granular, prolonged into a well-developed apical horn having a truncate apex with a small median projection. The capsule has a small apical prominence and almost fills the shell. A large pylome is developed in the vicinity of the girdle.
Dimensions: Holotype: 125 µm long, 94 µm broad, capsule 97 x 96 µm, horn 24 µm. Another specimen: 110 µm long, 71 µm broad, capsule 70 x 67 µm, horn 33 µm.