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Gonyaulax orthoceras
Gonyaulax orthoceras Eisenack, 1958a, p.388, pl.21, figs.3–11; pl.24, fig.1. Emendation: Sarjeant, 1985a, p.51,53, as Cribroperidinium orthoceras
NOW Cribroperidinium. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Cribroperidinium, fourthly Cribroperidinium?. Helenes, 1984, and Jan du Chene et al,, 1986, considered this to be a problematical species of Cribroperidinium. Lentin and Williams, 1973, retained this species in Cribroperidinium Neale and Sarjeant, 1962.
Taxonomic senior synonym: Gonyaulax (as Cribroperidinium) edwardsii, according to Davey and Verdier (1971, p.17) — however, Lentin and Williams (1985, p.79) retained Cribroperidinium orthoceras.
Holotype: Eisenack, 1958, pl.21, fig.5; Sarjeant, 1985, pl.1, figs.1,4, text-fig.1; Jan du Chene et al., 1986, pl.24, figs.7-8
Locus typicus: N Germany
Stratum typicum: Aptian
Translation Eisenack, 1958: LPP
Original diagnosis: Eisenack, 1958, p. 388-389: Gonyaulax orthoceras
Shell tick-walled, ovoidal with nearly hemisphaerical hypotheca with stong, thorn-like apical horn of 1/4 of overall length. Girdle furrow spiral, bordered by low but thick sutures. Tabulation clearly visible; plate bounaries reflected by narrow, very low sutures which bear as the plates themselves short thorns or tubercles. Pylome trapezoidal, generally higher than wide.
NOW Cribroperidinium. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Cribroperidinium, fourthly Cribroperidinium?. Helenes, 1984, and Jan du Chene et al,, 1986, considered this to be a problematical species of Cribroperidinium. Lentin and Williams, 1973, retained this species in Cribroperidinium Neale and Sarjeant, 1962.
Taxonomic senior synonym: Gonyaulax (as Cribroperidinium) edwardsii, according to Davey and Verdier (1971, p.17) — however, Lentin and Williams (1985, p.79) retained Cribroperidinium orthoceras.
Holotype: Eisenack, 1958, pl.21, fig.5; Sarjeant, 1985, pl.1, figs.1,4, text-fig.1; Jan du Chene et al., 1986, pl.24, figs.7-8
Locus typicus: N Germany
Stratum typicum: Aptian
Translation Eisenack, 1958: LPP
Original diagnosis: Eisenack, 1958, p. 388-389: Gonyaulax orthoceras
Shell tick-walled, ovoidal with nearly hemisphaerical hypotheca with stong, thorn-like apical horn of 1/4 of overall length. Girdle furrow spiral, bordered by low but thick sutures. Tabulation clearly visible; plate bounaries reflected by narrow, very low sutures which bear as the plates themselves short thorns or tubercles. Pylome trapezoidal, generally higher than wide.