Back
Gonyaulax tenuiceras
Gonyaulax tenuiceras Eisenack, 1958; Emendations: Sarjeant, 1985a, p.63,65-66, as Acanthaulax? tenuiceras; Jan du Chêne et al., 1986b, p.29-30, as Tehamadinium tenuiceras.
NOW Cribroperidinium?. Originally Gonyaulax, subsequently Gonyaulacysta?, thirdly Diacanthum, fourthly Occisucysta, fifthly Acanthaulax?, sixthly Tehamadinium, seventhly (and now) Cribroperidinium?.
Taxonomic junior synonym: Occisucysta victorii, according to Pöthe de Baldis and Ramos (1988, p.33).
Holotype: Eisenack, 1958, pl.21, fig.15; Sarjeant, 1985, pl.6, figs.1-2; text-fig.3; Jan du Chene et al., 1986, pl.118, fig.1; and Jan du Chene et al., 1986, pl.24, fig.5.
Locus typicus: between 761 and 767 m depth, borehole at Marne, Feld Heide, north Germany
Stratum typicum: Late Barremian-Aptian
Translation Eisenack, 1958: Sarjeant, 1985
Original diagnosis: Eisenack, 1958, p.390
Shell thick-walled (consequently almost always dark brown), oval to almost spherical, epitheca and hypotheca usually almost equally large; transverse furrow spiral, always clear, bounded by low but stout crests. Horn straight, usually sharply developed, not tapering, appearing rectangular, apically expanding into a "crownlet". Plate boundaries formed by low crests. Plates and in particular their boundary crests ornamented with + numerous and densely set lamellate spinelets, short, sometimes stout, often delicate however, the lateral lamellae of which may grow together to form a flange, which is especially prominent in the median plane. Pylome not rare, broader than high.
NOW Cribroperidinium?. Originally Gonyaulax, subsequently Gonyaulacysta?, thirdly Diacanthum, fourthly Occisucysta, fifthly Acanthaulax?, sixthly Tehamadinium, seventhly (and now) Cribroperidinium?.
Taxonomic junior synonym: Occisucysta victorii, according to Pöthe de Baldis and Ramos (1988, p.33).
Holotype: Eisenack, 1958, pl.21, fig.15; Sarjeant, 1985, pl.6, figs.1-2; text-fig.3; Jan du Chene et al., 1986, pl.118, fig.1; and Jan du Chene et al., 1986, pl.24, fig.5.
Locus typicus: between 761 and 767 m depth, borehole at Marne, Feld Heide, north Germany
Stratum typicum: Late Barremian-Aptian
Translation Eisenack, 1958: Sarjeant, 1985
Original diagnosis: Eisenack, 1958, p.390
Shell thick-walled (consequently almost always dark brown), oval to almost spherical, epitheca and hypotheca usually almost equally large; transverse furrow spiral, always clear, bounded by low but stout crests. Horn straight, usually sharply developed, not tapering, appearing rectangular, apically expanding into a "crownlet". Plate boundaries formed by low crests. Plates and in particular their boundary crests ornamented with + numerous and densely set lamellate spinelets, short, sometimes stout, often delicate however, the lateral lamellae of which may grow together to form a flange, which is especially prominent in the median plane. Pylome not rare, broader than high.